BXP


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue
bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:CommonStockSharesIssued
bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:CommonStockSharesOutstanding
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding
us-gaap:ConsolidatedEntities

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
us-gaap:ConsolidatedEntities

us-gaap:EarningsPerShareBasic
us-gaap:ConsolidatedEntities

us-gaap:EarningsPerShareDiluted
us-gaap:ConsolidatedEntities

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService, us-gaap:StatementGeographical
us-gaap:StatementBusinessSegments

us-gaap:Revenues
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServicesSold
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementGeographical
us-gaap:StatementBusinessSegments

us-gaap:GrossProfit
dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, us-gaap:StatementEquityComponents
us-gaap:Ownership
us-gaap:Ownership, us-gaap:StatementGeographical
us-gaap:StatementBusinessSegments, dei:LegalEntity
us-gaap:StatementBusinessSegments, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StatementGeographical
us-gaap:StatementGeographical, dei:LegalEntity
us-gaap:StatementGeographical, us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:OperatingExpenses

us-gaap:CostsAndExpenses
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:GeneralAndAdministrativeExpense
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:InterestExpense
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:ProfitLoss
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:ComprehensiveIncomeNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities

us-gaap:NetIncomeLoss
us-gaap:ConsolidatedEntities

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted
us-gaap:ConsolidatedEntities

us-gaap:Assets
us-gaap:ConsolidatedEntities

us-gaap:Liabilities
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:Land
us-gaap:ConsolidatedEntities

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:FairValueByMeasurementBasis
us-gaap:LongTermDebt

us-gaap:StockholdersEquity

us-gaap:CommonStockValue
bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInOperatingActivities
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInInvestingActivities
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInOperatingActivities
us-gaap:ConsolidatedEntities

us-gaap:NetIncomeLoss
us-gaap:ConsolidatedEntities

us-gaap:ProfitLoss
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInInvestingActivities
us-gaap:ConsolidatedEntities

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:ConsolidatedEntities

us-gaap:PaymentsOfDividends
us-gaap:ConsolidatedEntities

us-gaap:PaymentsOfDividends
us-gaap:ConsolidatedEntities

us-gaap:ShareBasedCompensation
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ConsolidatedEntities
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
bxp:AboveAndBelowMarketRentAdjustments

bxp:Accruedrentalincomenetdeconsolidated
us-gaap:ConsolidatedEntities

bxp:Allocationofundistributedearningstoparticipatingsecuritiesinshares

bxp:Allocationofundistributedearningstoparticipatingsecuritiespershares

bxp:Amortizationofrightofuseassetoperatingleases
us-gaap:ConsolidatedEntities
dei:LegalEntity
bxp:CompanysShareOfNetIncomeLoss

bxp:ConversionsOfNoncontrollingInterestsToStockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
bxp:DistributionsMadeToMYLTIPUnitsPerUnit

bxp:EarningsPerShareAfterAllccationofUndistributedEarningstoParticiaptingSecuritiesBasicdollarspershare
us-gaap:ConsolidatedEntities
bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan
bxp:EmployeeAndDirectorPaymentPerShare

bxp:EquityProfitLoss
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
bxp:Finalawardspercentageoftarget
us-gaap:SubsequentEventType, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
bxp:Futurepaymenttoacquireinterestinequitymethodinvestment
dei:LegalEntity
bxp:IncomeStatementBasisDifferential

bxp:IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors
us-gaap:ConsolidatedEntities
bxp:IssuanceOfRestrictedUnitsToEmployeesAndDirectors
us-gaap:Range, us-gaap:SubsequentEventType, bxp:PerformanceIndex, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan
bxp:MaximumEarnedAwards
us-gaap:Range, us-gaap:SubsequentEventType, bxp:PerformanceIndex, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan
bxp:Minimumearnedawards
us-gaap:StatementEquityComponents
bxp:NetIncomeAllocableToGeneralAndLimitedPartnerUnits

bxp:NetIncomeLossAvailableToCommonStockholdersAfterAllocationofUndistributedEarningstoParticipatingSecuritiesBasic
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
bxp:NetOperatingIncome
us-gaap:StatementBusinessSegments
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType
bxp:Numberofbuildings
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType, dei:LegalEntity

bxp:PercentageOfTotalNetOperatingIncome
us-gaap:StatementGeographical

bxp:PercentageOfTotalRentalExpenses
us-gaap:StatementGeographical

bxp:PercentageOfTotalRevenue
us-gaap:StatementGeographical

bxp:PercentageofCompanysShareofNetOperatingIncome
us-gaap:StatementGeographical
us-gaap:ConsolidatedEntities
bxp:RedeemableCommonUnits

bxp:RentalExpensesClassOffice
us-gaap:StatementGeographical

bxp:RentalExpensesOperatingExpensesTotal
us-gaap:StatementGeographical

bxp:RentalExpensesResidential
us-gaap:StatementGeographical

bxp:RentalRevenueClassOffice
us-gaap:StatementGeographical

bxp:RentalRevenueResidential
us-gaap:StatementGeographical

bxp:RentalRevenueTotal
us-gaap:StatementGeographical

bxp:TransferOfTenantImprovementsRealEstate
us-gaap:ConsolidatedEntities

bxp:TransferOfTenantLeaseCostsRealEstate
us-gaap:ConsolidatedEntities

bxp:WeightedAverageNumberDilutedSharesOutstandingAdjustmentpershare
us-gaap:ConsolidatedEntities

bxp:WeightedAverageNumberOfSharesOutstandingAfterAllocationofUndistributedEarningstoParticipatingSecuritiesBasicinshares
us-gaap:ConsolidatedEntities

bxp:Writeoffoffullydepreciatedrealestate
us-gaap:ConsolidatedEntities
us-gaap:StatementClassOfStock
dei:EntityListingParValuePerShare

us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
us-gaap:ConsolidatedEntities

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:AssetImpairmentCharges
us-gaap:StatementBusinessSegments

us-gaap:CapitalExpendituresIncurredButNotYetPaid
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
us-gaap:ConsolidatedEntities

us-gaap:CommonStockDividendsPerShareCashPaid
us-gaap:ConsolidatedEntities

us-gaap:CumulativeEffectOnRetainedEarningsNetOfTax1
us-gaap:StatementEquityComponents

us-gaap:DepreciationAndAmortization
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:DirectCostsOfLeasedAndRentedPropertyOrEquipment
us-gaap:ConsolidatedEntities
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty
us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss

us-gaap:Dividends
us-gaap:StatementEquityComponents

us-gaap:EquityMethodInvestmentDividendsOrDistributions
us-gaap:ConsolidatedEntities

us-gaap:FinanceLeasePrincipalPayments
us-gaap:ConsolidatedEntities

us-gaap:GainLossOnInvestments
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:GainLossOnSaleOfInvestments
us-gaap:ConsolidatedEntities

us-gaap:GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes
us-gaap:ConsolidatedEntities
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
us-gaap:StatementBusinessSegments

us-gaap:ImpairmentOfRealEstate
us-gaap:ConsolidatedEntities

us-gaap:IncomeLossFromEquityMethodInvestments
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
us-gaap:ConsolidatedEntities

us-gaap:IncreaseDecreaseInAccountsReceivable
us-gaap:ConsolidatedEntities

us-gaap:IncreaseDecreaseInFinanceReceivables
us-gaap:ConsolidatedEntities

us-gaap:IncreaseDecreaseInInterestPayableNet
us-gaap:ConsolidatedEntities

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities
us-gaap:ConsolidatedEntities

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
us-gaap:ConsolidatedEntities

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
us-gaap:ConsolidatedEntities

us-gaap:InterestAndOtherIncome
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:InterestCostsCapitalized
us-gaap:ConsolidatedEntities

us-gaap:InterestPaid
us-gaap:ConsolidatedEntities

us-gaap:LeaseCost
us-gaap:ConsolidatedEntities

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest

us-gaap:NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1
us-gaap:ConsolidatedEntities

us-gaap:NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable
us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents
us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

us-gaap:OperatingLeaseLeaseIncome
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseLeaseIncomeLeasePayments

us-gaap:OperatingLeasePayments
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseVariableLeaseIncome

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

us-gaap:OtherComprehensiveIncomeOtherNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:OtherCostAndExpenseOperating
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:PaidInKindInterest
us-gaap:ConsolidatedEntities

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents
us-gaap:PartnersCapitalAccountContributions
us-gaap:StatementEquityComponents
us-gaap:PartnersCapitalAccountDeferredCompensation
us-gaap:StatementEquityComponents
us-gaap:PartnersCapitalAccountDistributions
us-gaap:StatementEquityComponents
us-gaap:PartnersCapitalAccountExchangesAndConversions
us-gaap:StatementEquityComponents
us-gaap:PartnersCapitalAccountRedemptions

us-gaap:PaymentsForCapitalImprovements
us-gaap:ConsolidatedEntities

us-gaap:PaymentsForTenantImprovements
us-gaap:ConsolidatedEntities

us-gaap:PaymentsOfFinancingCosts
us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquireAndDevelopRealEstate
us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquireEquityMethodInvestments
us-gaap:ConsolidatedEntities
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType, dei:LegalEntity

us-gaap:PaymentsToAcquireMarketableSecurities
us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquireOtherProductiveAssets
us-gaap:ConsolidatedEntities

us-gaap:PaymentsToMinorityShareholders
us-gaap:ConsolidatedEntities
us-gaap:StatementClassOfStock
us-gaap:PreferredStockDividendRatePercentage

us-gaap:PreferredStockDividendsIncomeStatementImpact
us-gaap:StatementBusinessSegments

us-gaap:ProceedsFromIssuanceOrSaleOfEquity
us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromLinesOfCredit
us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromMinorityShareholders
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment
us-gaap:ConsolidatedEntities
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

us-gaap:RepaymentsOfLinesOfCredit
us-gaap:ConsolidatedEntities

us-gaap:RepaymentsOfSecuredDebt
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:StockIssuedDuringPeriodSharesConversionOfUnits
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
us-gaap:ConsolidatedEntities
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueConversionOfUnits

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:StraightLineRent
us-gaap:ConsolidatedEntities
dei:LegalEntity
us-gaap:StraightLineRentAdjustments
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:TransferOfOtherRealEstate
us-gaap:ConsolidatedEntities

us-gaap:TransferToInvestments
us-gaap:ConsolidatedEntities
us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:SubsequentEventType
bxp:Aggregatepurchaseprice
dei:LegalEntity
bxp:CompanyShareOfEquity
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType
bxp:ContractualSalesPrice
us-gaap:ConsolidatedEntities
bxp:DistributionsMadeToOpAndLtipUnitsPerUnit
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
bxp:FinanceLeasefixedpurchaseprice
us-gaap:ConsolidatedEntities
bxp:GeneralAndLimitedPartnersCapitalAccount

bxp:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesnet
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
bxp:LtipUnitsIssued
us-gaap:StatementEquityComponents
bxp:MYLTIPUnitsForfeited
us-gaap:SubsequentEventType, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan
us-gaap:ConsolidatedEntities
bxp:NoncontrollingInterestRedeemablePartnershipUnitsCommonUnitsLongTermIncentiveUnitsAtRedemptionValueSharesOutstanding
us-gaap:ConsolidatedEntities
bxp:NoncontrollingInterestRedeemablePartnershipUnitsCommonUnitsSharesOutstanding

bxp:RealEstateInvestmentPropertyAtCostIncludingRightofUseAssets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
bxp:TwothousandtwentyMYLTIP
bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan
bxp:ValueOfMyltipAwards
us-gaap:StatementEquityComponents
us-gaap:SubsequentEventType, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

dei:EntityCommonStockSharesOutstanding

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:AccountsReceivableNet
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:AdditionalPaidInCapital
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:AreaOfLand
us-gaap:FairValueByMeasurementBasis
us-gaap:AssetsFairValueDisclosure

us-gaap:ConstructionInProgressGross
us-gaap:ConsolidatedEntities
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DebtInstrumentCarryingAmount
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:MeasurementInputType
us-gaap:DebtInstrumentMeasurementInput
us-gaap:LongtermDebtType, us-gaap:MeasurementInputType
us-gaap:Range, us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:MeasurementInputType
us-gaap:Range, us-gaap:LongtermDebtType, us-gaap:MeasurementInputType

us-gaap:DeferredCosts
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:DeferredRentReceivablesNet
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:DividendsPayableAmountPerShare
us-gaap:ConsolidatedEntities

us-gaap:DividendsPayableCurrentAndNoncurrent
us-gaap:ConsolidatedEntities
bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
dei:LegalEntity
us-gaap:EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
dei:LegalEntity
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationAssets
dei:LegalEntity
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital

us-gaap:FinanceLeaseLiability
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:FinanceLeaseRightOfUseAsset
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:FurnitureAndFixturesGross
us-gaap:ConsolidatedEntities

us-gaap:GeneralPartnersCapitalAccountUnitsOutstanding
us-gaap:ConsolidatedEntities

us-gaap:InterestPayableCurrentAndNoncurrent
us-gaap:ConsolidatedEntities

us-gaap:InvestmentBuildingAndBuildingImprovements
us-gaap:ConsolidatedEntities

us-gaap:LandAvailableForDevelopment
us-gaap:ConsolidatedEntities

us-gaap:LeaseholdImprovementsGross
us-gaap:ConsolidatedEntities

us-gaap:LimitedPartnersCapitalAccountUnitsOutstanding
us-gaap:ConsolidatedEntities

us-gaap:LineOfCredit
us-gaap:ConsolidatedEntities
us-gaap:FairValueByMeasurementBasis

us-gaap:MarketableSecurities
us-gaap:ConsolidatedEntities

us-gaap:MinorityInterestInLimitedPartnerships

us-gaap:MinorityInterestInOperatingPartnerships

us-gaap:NotesReceivableGross
us-gaap:ConsolidatedEntities
us-gaap:FairValueByMeasurementBasis

us-gaap:NotesReceivableRelatedParties
us-gaap:ConsolidatedEntities
us-gaap:FairValueByMeasurementBasis
us-gaap:Range, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:RealEstateProperties
us-gaap:NumberOfRealEstateProperties
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:OperatingLeaseLiability
dei:LegalEntity
us-gaap:ConsolidatedEntities
dei:LegalEntity
us-gaap:OtherAssets

us-gaap:OtherBorrowings
us-gaap:ConsolidatedEntities
us-gaap:FairValueByMeasurementBasis

us-gaap:OtherLiabilities
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:ConsolidatedEntities
us-gaap:PartnersCapital
us-gaap:ConsolidatedEntities
us-gaap:PartnersCapitalAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementClassOfStock
us-gaap:PreferredStockParOrStatedValuePerShare

us-gaap:PreferredStockValue

us-gaap:PrepaidExpenseAndOtherAssets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:RealEstateInvestmentPropertyAtCost
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:RealEstateInvestmentPropertyNet
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:RedeemableNoncontrollingInterestEquityPreferredCarryingAmount
us-gaap:StatementEquityComponents

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities

us-gaap:SecuredDebt
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity
us-gaap:FairValueByMeasurementBasis
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:SeniorNotes
us-gaap:ConsolidatedEntities
us-gaap:FairValueByMeasurementBasis

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents

us-gaap:TemporaryEquitySharesSubscribedButUnissued
us-gaap:ConsolidatedEntities

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄11111111111111111111111111NA1111111111111NANANA1NANANA
 us-gaap:CommonStockValue bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan us-gaap:RestrictedStock▄▄▄▄▄▁▁▁▁████▁▁▁▁████▁▁▁▁▄33333222244442222444422223NA3322222211114NANANA2NANANA
us-gaap:CommonStockSharesIssued █▄▄▄▄▄▄▄▄▄▄▄▁▁▁▁▁▁▁▁▁▁▁▁▁▁155154154154154154154154154154154154153153153153153153153153153153153153153153NA152151151150150150149149148147146145140NANANA138NANANA
 us-gaap:CommonStockSharesIssued bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan us-gaap:RestrictedStock▃▄▄▄▃▂▂▂▁███▇▂▂▂▁▇▇▇▆▃▃▃▂█24503.026503.026503.026503.023083.020320.020320.020320.018226.037414.037414.037414.035839.022067.022067.022067.018521.034150.034150.034150.030965.023968.023968.023968.021455.036730.0NA36730.035087.020756.020756.020756.020756.019521.019521.019030.019030.019030.017795.069499.0NANANA62876.0NANANA
us-gaap:CommonStockSharesOutstanding █▆▆▆▆▆▆▆▆▆▆▆▃▃▃▃▃▃▃▃▃▃▃▃▃▁155154154154154154154154154154154154153153153153153153153153153153153153153152NA152151151150150150149149148147146145140NANANA138NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:ConsolidatedEntities us-gaap:LimitedPartner██▁▁▁▁▁▁▁▁153153152152152152152152152152NANANA152NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock█████████████████████████████████████▁█▇▇▁▇▇15515415415415415415415415415415415415315315315315315315315315315315315315315215215215115115015015014914914814701451401400139138NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 155NA154154154NA154154154NA154154154NA154153153NA153153153NA153153153NA152152151NA151150150148148NA147146142NA140139139NANANANA
 us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding us-gaap:ConsolidatedEntities srt:Subsidiaries172NA172172172NA172172172NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 155NA154154154NA154154154NA154154153NA153153153NA153153153NA153153153NA152151151NA150150150148148NA147145142NA139139138NANANANA
 us-gaap:WeightedAverageNumberOfSharesOutstandingBasic us-gaap:ConsolidatedEntities srt:Subsidiaries172NA172172172NA171171171NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasic █▃▃▃▃▃▃▃▄▃▃▃▃▃▂▃▄▃▄▂▄▄▃▂▂▂▃▇▂▂▂▃▃▂▂▃▂▂▂▁▂▂▂▂▂▂▂3.210.910.71.060.630.960.770.831.140.670.760.870.630.960.50.631.180.91.20.521.121.140.830.50.350.581.02.950.320.430.380.790.790.330.330.690.480.410.29-0.090.410.440.380.380.470.540.37
 us-gaap:EarningsPerShareBasic us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▂▂3.280.920.711.080.661.010.790.851.17NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareDiluted █▃▃▃▃▃▃▃▄▃▃▃▃▃▂▃▄▃▄▂▄▄▃▂▂▂▃▇▂▂▂▃▃▂▂▃▂▂▂▁▂▂▂▂▂▂▂3.20.910.71.060.630.960.770.831.140.670.760.870.630.960.50.631.180.91.20.521.111.140.830.50.350.581.02.940.310.430.380.790.790.330.330.690.480.410.29-0.090.410.440.380.380.470.530.37
 us-gaap:EarningsPerShareDiluted us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▂▂3.270.920.711.080.661.010.790.851.17NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax ████▁█▇▇▁▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▅▄75275774373387056866649655657656632636625623665624629618618613618589574576571515483478470472472438438452452436417392386393378376375389377
us-gaap:Revenues ████▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▅▄▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁752757743733725705686664661655657656632636625623665624629618618613618589574576571515483478470472472438438452452436417392386393378376375389377
 us-gaap:Revenues dei:LegalEntity bxp:UnconsolidatedJointVentures▅▄▄▄▄▄▄▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▅█93837580828276575656555554524938373838393939413838383799135NA135156156139139NA150144145NA155151150NANANANA
 us-gaap:Revenues us-gaap:ConsolidatedEntities srt:Subsidiaries██▇▆▆▄▃▁▁752757743733725705686664661NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ConsolidatedEntities,us-gaap:ProductOrService srt:Subsidiaries,srt:Hotel▁▆▆█▃▆▆▆▆688978888NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ConsolidatedEntities,us-gaap:ProductOrService srt:Subsidiaries,us-gaap:ManagementService█▄▄▄█▄▄▁▄322232212NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService srt:Hotel▁▆▆█▃▆▆▆▆688978888NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:ManagementService█▄▄▄█▄▄▁▄322232212NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,us-gaap:StatementGeographical srt:Hotel,bxp:Boston▁▆▆█▃▆▆▆68897888NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GrossProfit ██▆▆▅▃▂▁471467456454447429411406NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:Ownership bxp:CompanysShare██▆▆▅▄▂▁452447433433425409391379NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:Ownership,us-gaap:StatementGeographical bxp:CompanysShare,bxp:Boston█▇▅▄▂▂▁▁152149141138131131130129NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:Ownership,us-gaap:StatementGeographical bxp:CompanysShare,bxp:SanFrancisco█▇▇▆▅▃▂▁9794908782746862NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:Ownership,us-gaap:StatementGeographical bxp:CompanysShare,stpr:DC67NANANA69NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:Ownership,us-gaap:StatementGeographical bxp:CompanysShare,stpr:NY▅▅▄▆█▃▁▁119118117120126114108109NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:StatementGeographical bxp:Boston█▇▅▄▂▂▁▁159157149148140139137137NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:StatementGeographical bxp:SanFrancisco██▇▆▅▄▂▁9494908782746862NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:StatementGeographical stpr:DC61NANANA62NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:GrossProfit us-gaap:StatementGeographical stpr:NY▆▅▅▆█▄▁▁156152153154161149141142NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingExpenses dei:LegalEntity bxp:UnconsolidatedJointVentures▆▆▄▅▅▅▅▃▃▃▃▃▃▃▃▂▂▂▁▁▂▂▁▁▁▁▁▆█3533283030312922222323222221211616171515161615151515143242NA42-39-393838NA444242NA454241NANANANA
us-gaap:CostsAndExpenses █████▇▆▆▆▅▅▅▅▆▇▄▅▄▄▄▄▄▄▃▄▃▃▁▁481482474482475456447433452425423418426436467405415413402413412404404388397381384344352NA308299299303303NA287282279NA235228232NANANANA
 us-gaap:CostsAndExpenses dei:LegalEntity bxp:UnconsolidatedJointVentures▆▅▄▅▅▅▇▃▃▂▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▅█6759525459607437373539363636332525262424252524242425245981NA81-81-818080NA91147151NA96159156NANANANA
 us-gaap:CostsAndExpenses us-gaap:ConsolidatedEntities srt:Subsidiaries██▇█▇▄▃▁▄479480472480473454445431451NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ▆▅▄▆▇▃▄▃▆▄▃▃▄▃▃▃▄▂▁▂▃▂▂▂▄▁▂▂█3632313541272928352925273125252529242022282322232920242243NA1919192727NA172024NA181726NANANANA
 us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidatedEntities srt:Subsidiaries▆▄▃▅█▁▂▂▅363231354127292835NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:InterestExpense ▃▄▄▄▃▃▂▁▁▁▁▂▂▃▄▄▄▄▅▅▅▇▆▅▆██▄▃1011021061021011009592909192959597104105105106108108108117113110113121122103100NA1059999103103NA959599NA979692NANANANA
 us-gaap:InterestExpense dei:LegalEntity bxp:UnconsolidatedJointVentures▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▁▃▃▆█22222020202219141414139988888877777-8884056NA56-55-555555NA575757NA595958NANANANA
 us-gaap:InterestExpense us-gaap:ConsolidatedEntities srt:Subsidiaries▆▆█▆▆▅▃▂▁101102106102101100959290NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss █▃▂▃▂▃▂▂▃▂▂▂▂▂▁▂▃▂▅▂▃▃▂▂▁▂▃▇▁57717614120313118515016021613214716711516471117216166323100209211150956710617050657NA661341347474NA806948NA687262NANANANA
 us-gaap:ProfitLoss us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▁▂588177143205134192153162220NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax █▃▂▃▂▃▂▂▃▂▂▂▂▃▂▁▂▃▃▂▃▃▂▁▁▂▃▇▁4921471091649914812413218010712113410017185761411471649517117713079579215545548NA581191196565NA716041NA586253NANANANA
 us-gaap:ComprehensiveIncomeNetOfTax us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▂▂560165124185114173141150205NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▅▃▃▃▃▃▃▃▃▃▃▃▂▂▁▂▃▃█▂▃▃▂▂▂▂▂▄▂7732303630342829372527301515-71831261361835342016111415519NA8151599NA997NA10119NANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities srt:Subsidiaries█▄▇▅▇▄▁▁▅191618171816141417NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest █▃▂▃▂▃▂▂▃▂▂▂▂▃▁▁▂▃▄▂▃▃▂▂▁▂▃▇▁5691801402001301821531622171331491621172047885158175293117206212151966810617150758NA661351357474NA817048NA687363NANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▁▂580182142203133190156164222NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss █▃▃▃▃▃▃▃▄▃▃▃▃▃▂▃▄▃▄▂▄▄▃▂▂▂▃▇▂▂▂▃▃▂▂▃▂▂▂▁▂▂▂▂▂▂▂500140110166100148121131178103119136991477999184137186821731741307956881524554865571191194848101706040-1257615253656744
 us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▁▂568158124188116173138148203NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic █▂▂▃▂▃▂▂▃▂▂▂▂▃▁▂▃▂▃▁▃▃▂▁▁▂▃▇▁497140107164981481191281761031171339714776961811371847917117412776548815245247NANA1181184848NANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▁▂566158122185113173136145200NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ConsolidatedEntities,us-gaap:StatementBusinessSegments srt:Subsidiaries,us-gaap:IntersegmentElimination█▂▁▂▁▂▁▁▂566158122185113173136145200NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:StatementBusinessSegments us-gaap:IntersegmentElimination█▂▂▃▂▂▂▂▃▂▂▂▂▂▁▂▃▂▃▁▃▃▂▁▁49714010716498148119128176103117133971477696181137184791711741277654NANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted █▂▂▃▂▃▂▂▃▂▂▂▂▃▁▂▃▂▃▁▃▃▂▁▁▂▃▇▁496140107164981481191281751031171339714776961811381837917017412776549215244847NA571191196464NA706040NA576152NANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▁▂565158122185113173136145200NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets █▇▇▇▅▅▅▄▃▃▃▃▂▂▂▂▃▁▂▂▃▄▂▂▂▅2182921284212882126820501202562013719961195831937219308192811896618851187891896319175183791898019113191791988618875188981897920162NA19462156231546215141152801528014212142121478213980138841383513348NANANA12348NANANA
 us-gaap:Assets us-gaap:ConsolidatedEntities srt:Subsidiaries█▆▆▅▂▁215492099320995209732020419955NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Liabilities ████▅▅▄▄▃▃▃▃▂▂▂▂▃▁▂▂▂▄▄▄▄▇1340213262132851324712331120421193111747113991126911208112081104410919109301106511246104921091711019110731187811721117621182512967NA12569960896199345952395238641864193138540849284908328NANANA7223NANANA
 us-gaap:Liabilities us-gaap:ConsolidatedEntities srt:Subsidiaries█▇▇▇▂▁134021326213285132471233112042NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity █▇▇▇▅▅▅▄▃▃▃▃▂▂▂▂▃▁▂▂▃▄▂▂▂▅2182921284212882126820501202562013719961195831937219308192811896618851187891896319175183791898019113191791988618875188981897920162NA19462156231546215141152801528014212142121478213980138841383513348NANANA12348NANANA
 us-gaap:LiabilitiesAndStockholdersEquity dei:LegalEntity bxp:UnconsolidatedJointVentures█▇▇▆▆▆▆▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁50474407428040674194408939992335222021362090191418511816175513611266132812891282126012981197118610791087NA11115128516851625195519551955195521056715735NA5778NANANANANANANA
 us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities srt:Subsidiaries█▆▆▅▂▁215492099320995209732020419955NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:StockholdersEquity █▁▁▂▄▅▅▅▅▄▄▄▃▃▂▂▂▂▄▃▃▁▂▁▂▂60475684567157155836588358765892587958135825581457755786572557325749570958515782578256975725569157025741NA5624525650975119513451344963496348654825475746964372NANANA4446NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▂▃▄▁▂▁▂▁▁▂▂▁▁▁▄▅▂▅▅▄▆▃▄▄█▆▅▃▄▄▆▆▂▂▆▄▃▃▂▄▆▄▅6606447511087360543322472294434493492302356419118016057231387134210641763846103611792365164116089091041122316711671591591182310637807474781270170312201448NANANA
 us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities srt:Subsidiaries▄▄▅█▂▃▁▃▁▂6606447511087360543322472294434NANANA356NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities,us-gaap:VariableInterestEntitiesByClassificationOfEntity srt:Subsidiaries,us-gaap:VariableInterestEntityPrimaryBeneficiary▄▆▆▁▂█268280280245254296NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:VariableInterestEntitiesByClassificationOfEntity us-gaap:VariableInterestEntityPrimaryBeneficiary▄▅▅▃▄▆▆▅▄▇▆█▅▄▃▁▂268280280245254296284277267304285322271253244214227NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Land ▇█▇▆▆▇███▇▁▁▁▁▁507051115087505650615072510851085105508048804880487948794879NANA4806NANANA4785NANANA4450NANANA2605NANANANANA2356NANANA2216NANANA1983NANANA
 us-gaap:Land us-gaap:ConsolidatedEntities srt:Subsidiaries▃█▅▁▂▃497250114986495549614971NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures █▆▆▆▆▆▅▄▄▄▄▅▅▅▅▂▂▂▂▁▁▁▁▁▁▁1377955933936976956925682666619611819793775775252235235217209196193180176127126NA137652659664670670667667669770772762767NANANA763NANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity bxp:UnconsolidatedJointVentures█▆▅▅▆▆▅▄▄▄▄▅▅▅▅▂▁▁▁▁▁▁▁▁▁▁1355933910913952931901657641593588798772753752228211210192184173182180176127126NA137652659664670670667667669770772762767NANANA763NANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities srt:Subsidiaries█▁▁▁▂▁1377955933936976956NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName bxp:CAColoradoCenterLimitedPartnership▁▁▁▁▁▁▁▁▁▁▁████251252250254252253253253254254263514512510507NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName bxp:GatewayCommonsComplex348NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName bxp:SantaMonicaBusinessPark▁▄▄▅▆▇█151163163169175180183NANA0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 us-gaap:LongTermDebt us-gaap:FairValueByMeasurementBasis us-gaap:CarryingReportedAmountFairValueDisclosure█▇▇█▆▆▅▅▄▄▄▄▃▂▂▃▃▁▃▃▃▃▄▅▅▆120611181111838118461100511007108891072110339102711023410236970696169628975499809036972998679886990610475105581057711341NA11365NA8912NANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:FairValueByMeasurementBasis us-gaap:EstimateOfFairValueFairValueDisclosure████▅▄▄▄▃▄▄▄▂▂▃▃▄▁▃▃▄▃▅▅▅▆1225412311124021225911033108741074510626103341054910582105729948982810182103731048893571015110310104841040110943110871103311657NA11776NA9697NANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity █▁▁▂▄▅▅▅▅▄▄▄▃▃▂▂▂▂▄▃▃▁▂▁▂▂60475684567157155836588358765892587958135825581457755786572557325749570958515782578256975725569157025741NA5624525650975119513451344963496348654825475746964372NANANA4446NANANA
us-gaap:CommonStockValue ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄11111111111111111111111111NA1111111111111NANANA1NANANA
 us-gaap:CommonStockValue bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan us-gaap:RestrictedStock▄▄▄▄▄▁▁▁▁████▁▁▁▁████▁▁▁▁▄33333222244442222444422223NA3322222211114NANANA2NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▅▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▃▂▂▁█▇██-416-760-749-710-728-675-677-649-654-712-692-694-712-693-725-702-699-780-627-711-690-762-148-176-153-108NA192-160-109-59-34-34-70-70-53-72-69-56-24NANANA95NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▃▄▃▃▄▄▄▄▄▄▃▃▄▃▂▁▃▇▆█▇▇▇▇▇▇-55-48-51-51-48-47-45-47-49-50-51-53-50-52-73-79-56-14-201-11-9-9-10-10-11NA-12-13-13-14-14-14-15-15-16-16-17-17-18NANANA-21NANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂█▅▇▃█▃▇▄▆▄▁▄▆▂▄▇▃▂▄▃▄▂▃▁▄175361254358207379209335225314220125246293159235348190165241201225160184124227NANA237NA132NANA169169NANANA132NANANA60NANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities srt:Subsidiaries▁▇▄▇▂█▂▆▃175361254358207379209335225NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▄▃▅▅▆▂▄▅▄▆▄▄▅▁▄▅▁██▆▅▅▅▅▆-73-278-408-104-223-78-534-302-183-275-82-276-262-224-678-316-109-6792191762-176-141-199-147-79NANA-432NA-213NANA-760-760NANANA-121NANANA-152NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▄▄▇▄▅▅▆▅▅▅▆▅▅▄▄▇▄▄▅▂█▄▅▁▇65-195-203476-190-8521238-92-97-136340-37-130-241-344642-174-341-139-902867-208-128-1162575NANA62NA-367NANA-641-641NANANA257NANANA-135NANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:Subsidiaries▄▁▁█▁▂▃▆▂65-195-203476-190-8521238-92NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▂█▅▇▃█▃▇▄▆▄▁▄▆▂▄▇▃▂▄▃▄▂▃▁▄175361254358207379209335225314220125246293159235348190165241201225160184124227NANA237NA132NANA169169NANANA132NANANA60NANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities us-gaap:ConsolidatedEntities srt:Subsidiaries▁▇▄▇▂█▂▆▃175361254358207379209335225NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss █▃▃▃▃▃▃▃▄▃▃▃▃▃▂▃▄▃▄▂▄▄▃▂▂▂▃▇▂▂▂▃▃▂▂▃▂▂▂▁▂▂▂▂▂▂▂500140110166100148121131178103119136991477999184137186821731741307956881524554865571191194848101706040-1257615253656744
 us-gaap:NetIncomeLoss us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▁▂568158124188116173138148203NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss █▃▂▃▂▃▂▂▃▂▂▂▂▂▁▂▃▂▅▂▃▃▂▂▁▂▃▇▁57717614120313118515016021613214716711516471117216166323100209211150956710617050657NA661341347474NA806948NA687262NANANANA
 us-gaap:ProfitLoss us-gaap:ConsolidatedEntities srt:Subsidiaries█▂▁▂▁▂▁▁▂588177143205134192153162220NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DepreciationDepletionAndAmortization ▄▃▃▄▃▃▂▂▃▁▁▁▂▅█▁▂▃▁▃▁▂▂▁▁▂171169165177164165157156165154152151159178203153159164153167154162157154154155NANA121NA111NANA109109NANANA109NANANA83NANANANA
 us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidatedEntities srt:Subsidiaries▆▆▄█▄▄▂▁▄169168164175162163156154163NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▄▃▅▅▆▂▄▅▄▆▄▄▅▁▄▅▁██▆▅▅▅▅▆-73-278-408-104-223-78-534-302-183-275-82-276-262-224-678-316-109-6792191762-176-141-199-147-79NANA-432NA-213NANA-760-760NANANA-121NANANA-152NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▄▄▇▄▅▅▆▅▅▅▆▅▅▄▄▇▄▄▅▂█▄▅▁▇65-195-203476-190-8521238-92-97-136340-37-130-241-344642-174-341-139-902867-208-128-1162575NANA62NA-367NANA-641-641NANANA257NANANA-135NANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities us-gaap:ConsolidatedEntities srt:Subsidiaries▄▁▁█▁▂▃▆▂65-195-203476-190-8521238-92NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividends ▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃▁▁▁█▁▁▁▄▁171166166166166166140140140131131131131114114114328114114114883113113116496113NANA110NA93NANA9292NANANA81NANANA80NANANANA
 us-gaap:PaymentsOfDividends us-gaap:ConsolidatedEntities srt:Subsidiaries█▇▇▇▇▇▁▁▁171166166166166166140140140NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsOfDividends ▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃▁▁▁█▁▁▁▄▁171166166166166166140140140131131131131114114114328114114114883113113116496113NANA110NA93NANA9292NANANA81NANANA80NANANANA
 us-gaap:PaymentsOfDividends us-gaap:ConsolidatedEntities srt:Subsidiaries█▇▇▇▇▇▁▁▁171166166166166166140140140NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value11111111111111111111111111111111111111
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:RestrictedStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value333332222444422224444222233322221111420
Percentage of CommonStockValue225.4226.1226.4226.4194.2155.3155.4155.4142.5317.6317.6317.6305.6162.5162.5162.7136.7312.5312.5312.7286.8169.8169.8169.8150.3254.9255.9244.1145.1145.8146.0140.6121.5122.0123.0110.3321.0201.60.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:RestrictedStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-05-232018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-05-172016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-05-202014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value155154154154154154154154015415415415415315315315301531531531531531531531530153153152151151150150149148147146145140138
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:RestrictedStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312013-02-012012-12-312012-09-302012-06-302012-03-312012-02-032011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value24503.026503.026503.026503.023083.020320.020320.020320.018226.037414.037414.037414.035839.022067.022067.022067.018521.034150.034150.034150.030965.023968.023968.023968.021455.036730.036730.035087.035087.020756.020756.020756.019521.019521.019030.019030.019030.017795.069499.062876.04723.0
Percentage of CommonStockSharesIssued0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

us-gaap:RestrictedStock, us-gaap:SubsequentEvent



Period End2020-01-312019-02-012018-02-022017-02-032016-02-082015-02-03
Value24503.023083.018226.035839.018521.030965.0
Percentage of CommonStockSharesIssued0.00.00.00.00.00.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value155154154154154154154154154154154154153153153153153153153153153153153153153152152151151150150149148147146145140138
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:GeneralPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value11111111111
Percentage of CommonStockSharesOutstanding1.11.11.11.11.11.11.11.11.11.11.1

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value153153152152152152152152152152152
Percentage of CommonStockSharesOutstanding98.998.998.998.998.998.998.998.998.998.998.9

us-gaap:StatementEquityComponents

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value15515415415415415415415415415415415415315315315315315315315315315315315315315215215215115115015014914814701451401400139138121119
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.1100.0100.00.00.00.0100.00.00.0

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value155154154154154154154154154154154153153153153153153153153152152151151150150148147146142140139139
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value172172172172172172172
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding111.3111.4111.4111.4111.3111.3111.3

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value155154154154154154154154154153153153153153153153153153153152151151150150150148147145142139139138
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value172172172172171171171
Percentage of WeightedAverageNumberOfSharesOutstandingBasic111.3111.4111.4111.4111.3111.3111.3

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3.210.910.71.060.630.960.770.831.140.670.760.870.630.960.50.631.180.91.20.521.121.140.830.50.350.581.02.950.320.430.380.790.790.330.440.690.480.410.29-0.090.410.440.380.380.470.540.37
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.280.920.711.080.661.010.790.851.17
Percentage of EarningsPerShareBasic102.2101.1101.4101.9104.8105.2102.6102.4102.6

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value3.20.910.71.060.630.960.770.831.140.670.760.870.630.960.50.631.180.91.20.521.111.140.830.50.350.581.02.940.310.430.380.790.780.330.430.690.480.410.29-0.090.410.440.380.380.470.530.37
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.270.920.711.080.661.010.790.851.17
Percentage of EarningsPerShareDiluted102.2101.1101.4101.9104.8105.2102.6102.4102.6

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value75275774373387056866649655657656632636625623665624629618618613618589574576571515483478470472471438447452452436417392386393378376375389377
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

srt:Subsidiaries, bxp:ParkingandOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value242625262427262626
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.33.53.43.6278.73.93.94.0287.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.33.53.43.6278.73.93.94.0287.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries bxp:ParkingandOther100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:Subsidiaries, srt:Hotel



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value611131481113149
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.61.82.0100.01.72.02.2100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.61.82.0100.01.72.02.2100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries srt:Hotel100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:Subsidiaries, us-gaap:ManagementService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7101093121592
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.41.41.438.01.72.21.431.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.41.41.438.01.72.21.431.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:ManagementService100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:Subsidiaries, us-gaap:RealEstateOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value32223221
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.30.30.338.00.30.40.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.30.30.338.00.30.40.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:RealEstateOther100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:ManagementService, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-7-10-10-9-9-12-15-9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.0-1.4-1.4-1.4-103.8-1.7-2.2-1.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.0-1.4-1.4-1.4-103.8-1.7-2.2-1.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:ManagementService us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-3-2-2-2-3-2-2-1-2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.4-0.3-0.3-0.3-38.0-0.3-0.4-0.3-31.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.4-0.3-0.3-0.3-38.0-0.3-0.4-0.3-31.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

bxp:ParkingandOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value242625262427262626
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.33.53.43.6278.73.93.94.0287.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.33.53.43.6278.73.93.94.0287.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:ParkingandOther100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:Hotel



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value611131481113149
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.61.82.0100.01.72.02.2100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.61.82.0100.01.72.02.2100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Hotel100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ManagementService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value7101093121592
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.41.41.438.01.72.21.431.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.41.41.438.01.72.21.431.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ManagementService100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value32223221
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.30.30.338.00.30.40.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.30.30.338.00.30.40.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RealEstateOther100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

us-gaap:ManagementService, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-7-10-10-9-9-12-15-9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.0-1.4-1.4-1.4-103.8-1.7-2.2-1.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.0-1.4-1.4-1.4-103.8-1.7-2.2-1.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ManagementService us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService, us-gaap:StatementGeographical

srt:Hotel, bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value61113148111314
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.61.82.0100.01.72.02.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.61.82.0100.01.72.02.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Hotel bxp:Boston100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-3-2-2-2-3-2-2-1-2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.4-0.3-0.3-0.3-38.0-0.3-0.4-0.3-31.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.4-0.3-0.3-0.3-38.0-0.3-0.4-0.3-31.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value752757743733725705686664661655657656632636625623665624629618618613618589574576571515483478470472471438447452452436417392386393378376375389377
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.08120.0100.0100.0100.07263.8100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value93837580828276575656555554524938373838393939413838383799135135135156156139150144145155151150
Percentage of Revenues12.411.110.210.911.411.711.18.68.58.68.48.58.78.27.86.25.76.26.16.36.46.56.86.56.66.66.619.428.128.933.031.733.233.234.940.138.439.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax12.411.110.210.9928.111.711.18.6620.68.68.48.58.78.27.86.25.76.26.16.36.46.56.86.56.66.66.619.40.028.128.933.033.131.133.233.234.940.138.439.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value752757743733725705686664661
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.08120.0100.0100.0100.07263.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Cost Of Goods And Services Sold

us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

srt:Subsidiaries, srt:Hotel



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value688978888
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.11.21.288.01.21.31.388.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries srt:Hotel99.970.567.261.288.070.064.659.888.7

srt:Subsidiaries, us-gaap:ManagementService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value322232212
Percentage of CostOfGoodsAndServicesSold47.526.027.826.543.227.028.522.535.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.30.30.338.00.30.40.331.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:ManagementService41.120.623.624.1100.018.216.521.2100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-3-2-2-2-3-2-2-1-2
Percentage of CostOfGoodsAndServicesSold-47.5-26.0-27.8-26.5-43.2-27.0-28.5-22.5-35.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.4-0.3-0.3-0.3-38.0-0.3-0.4-0.3-31.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProductOrService

srt:Hotel



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value688978888
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.11.21.288.01.21.31.388.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Hotel99.970.567.261.288.070.064.659.888.7

us-gaap:ManagementService



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value322232212
Percentage of CostOfGoodsAndServicesSold47.526.027.826.543.227.028.522.535.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.30.30.338.00.30.40.331.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ManagementService41.120.623.624.1100.018.216.521.2100.0

us-gaap:ProductOrService, us-gaap:StatementGeographical

srt:Hotel, bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value68897888
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.91.11.21.288.01.21.31.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Hotel bxp:Boston99.970.567.261.288.070.064.659.8

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-3-2-2-2-3-2-2-1-2
Percentage of CostOfGoodsAndServicesSold-47.5-26.0-27.8-26.5-43.2-27.0-28.5-22.5-35.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.4-0.3-0.3-0.3-38.0-0.3-0.4-0.3-31.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:IntersegmentElimination100.0100.0100.0100.0100.0100.0100.0100.0100.0

Gross Profit

us-gaap:GrossProfit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value471467456454447429411406
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax62.761.761.461.95009.160.960.061.2

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2824232425252216
Percentage of GrossProfit6.15.35.15.45.75.85.54.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.83.23.13.4283.63.63.32.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, dei:LegalEntity

srt:Subsidiaries, us-gaap:IntersegmentElimination, bxp:UnconsolidatedJointVentures



Period End2020-03-312019-06-302019-03-312018-06-30
Value28242516
Percentage of GrossProfit6.15.45.74.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.83.4283.62.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:IntersegmentElimination bxp:UnconsolidatedJointVentures0.00.00.00.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, us-gaap:StatementEquityComponents

srt:Subsidiaries, us-gaap:IntersegmentElimination, bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-06-302019-03-312018-06-30
Value-47-45-47-43
Percentage of GrossProfit-10.1-10.0-10.5-10.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-6.3-6.2-526.8-6.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:IntersegmentElimination bxp:Noncontrollinginterestpropertypartnerships0.00.00.00.0

us-gaap:Ownership

bxp:CompanysShare



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value452447433433425409391379
Percentage of GrossProfit96.095.694.995.495.195.395.093.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax60.259.058.359.14765.958.057.057.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:CompanysShare0.00.00.00.00.00.00.00.0

us-gaap:Ownership, us-gaap:StatementGeographical

bxp:CompanysShare, bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value152149141138131131130129
Percentage of GrossProfit32.332.030.930.629.530.731.631.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax20.219.819.018.91475.518.719.019.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:CompanysShare bxp:Boston0.00.00.00.00.00.00.00.0

bxp:CompanysShare, bxp:LosAngeles



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value151514151515136
Percentage of GrossProfit3.43.33.23.43.53.63.21.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.12.02.02.1175.72.21.91.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:CompanysShare bxp:LosAngeles0.00.00.00.00.00.00.00.0

bxp:CompanysShare, bxp:SanFrancisco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9794908782746862
Percentage of GrossProfit20.620.119.819.318.417.316.515.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax12.912.412.212.0922.810.69.99.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:CompanysShare bxp:SanFrancisco0.00.00.00.00.00.00.00.0

bxp:CompanysShare, stpr:DC



Period End2020-03-312019-03-31
Value6769
Percentage of GrossProfit14.315.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.0780.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:CompanysShare stpr:DC0.00.0

bxp:CompanysShare, stpr:NY



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value119118117120126114108109
Percentage of GrossProfit25.425.425.726.628.226.726.326.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.915.715.816.51411.716.215.816.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:CompanysShare stpr:NY0.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments, dei:LegalEntity

us-gaap:IntersegmentElimination, bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2824232425252216
Percentage of GrossProfit6.15.35.15.45.75.85.54.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.83.23.13.4283.63.63.32.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:IntersegmentElimination bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments, us-gaap:StatementEquityComponents

us-gaap:IntersegmentElimination, bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-47-45-46-45-47-45-43-43
Percentage of GrossProfit-10.1-9.6-10.1-10.0-10.5-10.6-10.5-10.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-6.3-6.0-6.2-6.2-526.8-6.4-6.3-6.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:IntersegmentElimination bxp:Noncontrollinginterestpropertypartnerships0.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-47-45-46-45-47-45-43-43
Percentage of GrossProfit-10.1-9.6-10.1-10.0-10.5-10.6-10.5-10.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-6.3-6.0-6.2-6.2-526.8-6.4-6.3-6.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:Noncontrollinginterestpropertypartnerships0.00.00.00.00.00.00.00.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value159157149148140139137137
Percentage of GrossProfit33.933.732.832.631.432.633.533.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax21.220.820.220.21571.719.820.120.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:Boston0.00.00.00.01571.71190.91008.3938.0

bxp:SanFrancisco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value9494908782746862
Percentage of GrossProfit20.020.119.819.318.517.416.515.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax12.512.412.212.0927.810.69.99.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:SanFrancisco0.00.00.00.00.00.00.00.0

stpr:DC



Period End2020-03-312019-03-31
Value6162
Percentage of GrossProfit13.114.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.2700.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:DC0.00.0

stpr:NY



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value156152153154161149141142
Percentage of GrossProfit33.132.733.534.136.134.734.335.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax20.720.220.621.11808.721.120.621.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:NY0.00.00.00.00.00.00.00.0

us-gaap:StatementGeographical, dei:LegalEntity

bxp:Boston, bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value32100000
Percentage of GrossProfit0.70.50.40.20.20.20.20.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.30.20.18.60.10.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:Boston bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.0

bxp:LosAngeles, bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value151514151515136
Percentage of GrossProfit3.43.33.23.43.53.63.21.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.12.02.02.1175.72.21.91.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:LosAngeles bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.0

bxp:SanFrancisco, bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value30000000
Percentage of GrossProfit0.70.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:SanFrancisco bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.0

stpr:DC, bxp:UnconsolidatedJointVentures



Period End2020-03-312019-03-31
Value57
Percentage of GrossProfit1.21.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.879.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:DC bxp:UnconsolidatedJointVentures0.00.0

stpr:NY, bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00011111
Percentage of GrossProfit0.20.2-0.00.40.40.40.40.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.1-0.00.220.00.20.20.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:NY bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.0

us-gaap:StatementGeographical, us-gaap:StatementEquityComponents

bxp:Boston, bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-10-10-10-10-9-8-8-8
Percentage of GrossProfit-2.3-2.2-2.3-2.2-2.1-2.1-2.0-2.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.4-1.4-1.4-1.4-104.9-1.3-1.2-1.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:Boston bxp:Noncontrollinginterestpropertypartnerships0.00.00.00.00.00.00.00.0

bxp:SanFrancisco, bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.00.00.00.0-448000.0-214000.0-13000.0120000.0
Percentage of GrossProfit0.00.00.00.0-0.1-0.0-0.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.0-5.0-0.0-0.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:SanFrancisco bxp:Noncontrollinginterestpropertypartnerships0.00.00.00.00.00.00.00.0

stpr:NY, bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-36-34-35-35-37-36-34-34
Percentage of GrossProfit-7.8-7.4-7.9-7.8-8.3-8.4-8.4-8.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-4.9-4.6-4.8-4.8-416.9-5.1-5.1-5.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax stpr:NY bxp:Noncontrollinginterestpropertypartnerships0.00.00.00.00.00.00.00.0

Operating Expenses

dei:LegalEntity

us-gaap:OperatingExpenses

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value35332830303129222223232222212116161715151616151515151432424242-393938444242454241
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.74.43.94.1341.24.44.33.4251.03.53.53.43.53.53.52.62.52.72.52.62.62.72.52.62.72.72.66.30.08.89.0-8.38.38.79.99.710.311.810.911.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Costs And Expenses

us-gaap:CostsAndExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value481482474482475456447433452425423418426436467405415413402413412404404388397381384344352308299298303287282279235228232
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax63.963.763.865.75321.064.865.365.34976.965.064.563.767.468.674.865.062.466.363.866.966.766.065.365.969.266.267.366.973.065.463.363.267.763.664.767.060.958.061.6

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value67595254596074373735393636363325252624242525242424252459818181-8181809114715196159156
Percentage of CostsAndExpenses14.012.411.011.412.413.216.68.68.38.39.38.78.58.47.26.36.26.46.16.06.16.46.26.36.26.76.417.323.226.5-27.426.731.752.354.040.869.867.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.07.97.07.5661.78.510.95.6412.85.46.05.55.85.85.44.13.94.23.94.04.14.24.04.24.34.44.311.60.016.917.3-17.317.418.020.233.836.224.940.541.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value479480472480473454445431451
Percentage of CostsAndExpenses99.699.699.699.599.699.699.699.699.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax63.763.563.565.45299.664.565.065.04955.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value363231354127292835292527312525252924202228232223292024224319191927172024181726
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.84.34.24.8467.23.94.34.3394.44.53.94.15.04.04.04.14.43.93.33.64.73.83.73.95.23.64.34.39.04.24.04.06.23.84.65.94.74.57.1

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value363231354127292835
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.84.34.24.8467.23.94.34.3394.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-36-32-31-35-41-27-29-28-35
Percentage of GeneralAndAdministrativeExpense-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-4.8-4.3-4.2-4.8-467.2-3.9-4.3-4.3-394.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:IntersegmentElimination1126.21519.11282.31459.51230.11247.51179.51445.11244.2

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value-36-32-31-35-41-27-29-28-35-29-25-27-31-25-25-2529242022282322232920242243191919271618
Percentage of GeneralAndAdministrativeExpense-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.097.693.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-4.8-4.3-4.2-4.8-467.2-3.9-4.3-4.3-394.4-4.5-3.9-4.1-5.0-4.0-4.0-4.14.43.93.33.64.73.83.73.95.23.64.34.39.04.24.04.06.23.74.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:IntersegmentElimination1126.21519.11282.31459.51230.11247.51179.51445.11244.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value10110210610210110095929091929595971041051051061081081081171131101131211221031001059999103959599979692
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.513.614.314.01130.114.213.913.9991.214.014.014.515.115.416.716.815.817.017.317.617.619.218.318.819.821.021.420.020.822.321.121.223.121.221.823.725.124.624.3

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value22222020202219141414139988888877777-8884056-5656-555555575757595958
Percentage of InterestExpense22.221.719.220.320.522.220.816.016.015.914.29.99.79.08.08.08.07.77.47.47.36.77.07.2-7.16.76.738.856.053.8-56.053.660.259.958.360.961.263.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.03.02.82.8232.23.22.92.2158.52.22.01.41.51.41.31.31.31.31.31.31.31.31.31.4-1.41.41.47.80.0-11.612.0-11.811.912.412.813.113.815.315.015.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value101102106102101100959290
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.513.614.314.01130.114.213.913.9991.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-101-102-106-102-101-100-95-92-90
Percentage of InterestExpense-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-13.5-13.6-14.3-14.0-1130.1-14.2-13.9-13.9-991.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:IntersegmentElimination3138.44765.24383.34259.62975.24523.63790.44680.43127.2

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value-101-102-106-102-101-100-95-92-90-91-92-95-95-97-104-10510510610810810811711311011312112210310010599991039594
Percentage of InterestExpense-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.399.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-13.5-13.6-14.3-14.0-1130.1-14.2-13.9-13.9-991.2-14.0-14.0-14.5-15.1-15.4-16.7-16.815.817.017.317.617.619.218.318.819.821.021.420.020.822.321.121.223.121.021.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:IntersegmentElimination3138.44765.24383.34259.62975.24523.63790.44680.43127.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense Debt

Income Loss From Continuing Operations

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value577176141203131185150160216132147167115164711172161663231002092111509567106170506576613413474806948687262
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax76.723.219.027.71467.426.321.924.22376.520.222.525.418.325.911.418.832.526.751.316.333.834.524.416.311.818.529.898.312.014.028.528.516.517.816.011.517.618.416.5

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value30239316-1844621096643456659554170-2-2-1181823825385
Percentage of ProfitLoss0.60.21.619.22.39.0-12.13.12.14.91.96.17.94.09.53.81.62.61.76.33.02.86.06.18.14.310.30.0-3.8-1.713.54.047.73.611.65.411.59.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.10.35.334.22.4-2.70.849.31.00.41.51.41.01.10.70.50.70.91.01.01.01.51.01.00.83.10.00.0-0.5-0.23.83.90.78.50.61.30.92.11.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value588177143205134192153162220
Percentage of ProfitLoss102.0101.0101.3101.2102.8104.1102.1101.5102.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax78.223.519.328.11508.627.422.424.52425.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value49214710916499148124132180107121134100171857614114716495171177130795792155455485811911965716041586253
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax65.519.414.822.41115.921.118.120.01977.716.518.420.416.027.013.612.221.323.626.115.527.729.021.213.510.016.027.388.410.112.425.325.314.615.713.99.915.115.814.1

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value560165124185114173141150205
Percentage of ComprehensiveIncomeNetOfTax113.8112.6113.0112.8115.2116.8114.0113.1113.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax74.521.916.725.31285.524.620.622.62252.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value7732303630342829372527301515-7183126136183534201611141551981515999710119
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax10.24.34.25.0340.44.84.24.4413.83.94.24.72.52.4-1.32.94.84.221.73.05.75.63.32.81.92.62.610.02.11.83.33.32.12.22.21.82.72.82.6

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value191618171816141417
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest25.550.660.148.362.448.652.249.746.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.62.22.52.4212.32.32.22.2190.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value56918014020013018215316221713314916211720478851581752931172062121519668106171507586613513474817048687363
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax75.623.818.927.41456.725.922.424.42394.820.422.724.718.532.112.513.723.828.146.618.933.434.624.516.411.918.629.998.512.114.228.628.616.717.916.111.717.818.716.7

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value580182142203133190156164222
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest102.0101.0101.3101.2102.8104.2102.1101.5102.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax77.124.019.227.71497.827.022.824.82443.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value500140110166100148121131178103119136991477999184137186821731741307956881524554865571191184864101706040-1257615253656744
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax66.518.614.822.81127.021.117.719.81962.715.818.220.815.823.112.715.927.722.129.613.328.128.421.113.49.915.426.788.39.913.712.325.225.211.014.422.415.613.89.8-3.314.915.613.914.217.517.311.8

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value568158124188116173138148203
Percentage of NetIncomeLoss113.8112.8113.0112.8115.2117.0114.0113.2113.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax75.621.016.825.71297.924.720.222.42236.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-302012-03-31
Value49714010716498148119128176103117133971477696181137184791711741277654881524524711848
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax66.118.614.522.41097.621.117.419.41933.915.817.820.415.423.112.315.527.322.129.212.927.728.420.613.09.415.426.787.89.925.210.8

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value566158122185113173136145200
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic113.8112.8113.3113.0115.6117.1114.3113.4114.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax75.321.016.425.31268.524.719.822.02207.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value566158122185113173136145200
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic113.8112.8113.3113.0115.6117.1114.3113.4114.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax75.321.016.425.31268.524.719.822.02207.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries us-gaap:IntersegmentElimination-17495.6-7359.3-5027.5-7728.5-3339.7-7833.9-5413.4-7409.2-6963.8

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value49714010716498148119128176103117133971477696181137184791711741277654
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax66.118.614.522.41097.621.117.419.41933.915.817.820.415.423.112.315.527.322.129.212.927.728.520.613.09.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:IntersegmentElimination-15369.0-6523.1-4436.8-6838.0-2889.7-6692.7-4734.4-6532.0-6101.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Diluted

us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value4961401071649814811912817510311713397147769618113818379170174127765492152448475711911864706040576152
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax66.018.614.522.41097.621.117.419.41932.515.917.820.315.423.112.315.527.322.129.212.927.628.520.613.09.416.126.687.19.912.325.225.214.415.613.89.814.915.613.9

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value565158122185113173136145200
Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted113.8112.8113.3113.0115.6117.1114.3113.4114.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax75.121.016.425.31268.524.619.822.02205.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2182921284212882126820501202562013719961195831937219308192811896618851187891896319175183791898019113191791988618875188981897920162194621562315462151411528014212147821398013884138351334812348
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value215492099320995209732020419955
Percentage of Assets98.798.698.698.698.598.5
Percentage of Assets98.798.698.698.698.598.5
Percentage of Assets srt:Subsidiaries100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13402132621328513247123311204211931117471139911269112081120811044109191093011065112461049210917110191107311878117211176211825129671256996089619934595238641931385408492849083287223
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets61.462.362.462.360.159.559.358.958.258.258.158.158.257.958.258.458.657.157.557.757.759.762.162.262.364.364.661.562.261.762.360.863.061.161.261.462.458.5

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value134021326213285132471233112042
Percentage of Liabilities100.0100.0100.0100.0100.0100.0
Percentage of Assets61.462.362.462.360.159.5
Percentage of Assets srt:Subsidiaries62.263.263.363.261.060.3

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2182921284212882126820501202562013719961195831937219308192811896618851187891896319175183791898019113191791988618875188981897920162194621562315462151411528014212147821398013884138351334812348
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value504744074280406741944089399923352220213620901914185118161755136112661328128912821260129811971186107910871111512851685162519551955210567157355778
Percentage of LiabilitiesAndStockholdersEquity23.120.720.119.120.520.219.911.711.311.010.89.99.89.69.37.26.67.26.86.76.66.56.36.35.75.45.732.833.434.134.036.635.240.641.343.3
Percentage of Assets23.120.720.119.120.520.219.911.711.311.010.89.99.89.69.37.26.67.26.86.76.66.56.36.35.75.45.732.833.434.134.036.635.240.641.343.3
Percentage of Assets bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value215492099320995209732020419955
Percentage of LiabilitiesAndStockholdersEquity98.798.698.698.698.598.5
Percentage of Assets98.798.698.698.698.598.5
Percentage of Assets srt:Subsidiaries100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value60475684567157155836588358765892587958135825581457755786572557325749570958515782578256975725569157025741562452565097511951344963486548254757469643724446
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets27.726.726.626.928.529.029.229.530.030.030.230.230.530.730.530.230.031.130.830.330.128.630.330.130.028.528.933.633.033.833.634.932.934.534.333.932.836.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value6606447511087360543322472294434493492302356419118016057231387134210641763846103611792365164116089091041122316715911823106378074747812701703122014482411506
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.03.03.55.11.82.71.62.41.52.22.62.61.61.92.26.28.43.97.37.05.58.94.55.56.211.70.08.35.86.78.110.94.212.37.65.65.43.60.00.00.011.70.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value6606447511087360543322472294434356
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.03.03.55.11.82.71.62.41.52.21.9
Percentage of Assets srt:Subsidiaries3.13.13.65.21.82.70.00.00.00.00.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value268280280245254296
Percentage of CashAndCashEquivalentsAtCarryingValue40.643.437.322.670.654.6
Percentage of Assets1.21.31.31.21.21.5
Percentage of Assets srt:Subsidiaries us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.00.00.0

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value268280280245254296284277267304285322271253244214227
Percentage of CashAndCashEquivalentsAtCarryingValue40.643.437.322.670.654.688.158.790.970.157.865.589.671.258.218.214.2
Percentage of Assets1.21.31.31.21.21.51.41.41.41.61.51.71.41.31.31.11.2
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Land

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value5070511150875056506150725108510851055080488048804879487948794806478544502605235622161983
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets23.224.023.923.824.725.025.425.626.126.225.325.325.725.926.026.124.122.116.815.916.616.1

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value497250114986495549614971
Percentage of Land98.198.098.098.098.098.0
Percentage of Assets22.823.523.423.324.224.5
Percentage of Assets srt:Subsidiaries23.123.923.823.624.624.9

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1377955933936976956925682666619611819793775775252235235217209196193180176127126137652659664670667669770772762767763
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.34.54.44.44.84.74.63.43.43.23.24.24.24.14.11.31.21.31.11.11.01.01.00.90.70.60.74.24.34.44.44.74.55.55.65.55.76.2

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1355933910913952931901657641593588798772753752228211210192184173182180176127126137652659664670667669770772762767763
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures98.497.797.597.597.597.497.496.496.295.896.397.597.397.297.190.589.689.388.587.988.494.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.24.44.34.34.64.64.53.33.33.13.14.14.14.04.01.21.11.11.01.00.90.91.00.90.70.60.74.24.34.44.44.74.55.55.65.55.76.2
Percentage of Assets bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1377955933936976956
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0
Percentage of Assets6.34.54.44.44.84.7
Percentage of Assets srt:Subsidiaries6.44.64.44.54.84.8

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:AnnapolisJunctionNfmLlc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value25252525252517171718181919202121212927262525242317
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures1.82.72.72.72.62.61.92.62.73.03.12.42.52.62.78.59.012.312.812.813.213.113.613.413.8
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.10.10.10.10.10.10.1
Percentage of Assets bxp:AnnapolisJunctionNfmLlc0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:BNYTowerHoldingsLLC



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value959494918382727171726755433325181211109
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures6.99.910.19.78.58.67.810.510.711.611.16.85.54.33.37.35.24.94.74.4
Percentage of Assets0.40.40.40.40.40.40.40.40.40.40.40.30.20.20.10.10.10.10.10.0
Percentage of Assets bxp:BNYTowerHoldingsLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:BPCRFMetropolitanSquareLLC



Period End2020-03-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1392329
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures1.01.00.30.50.33.9
Percentage of Assets0.10.00.00.00.00.0
Percentage of Assets bxp:BPCRFMetropolitanSquareLLC0.00.00.00.00.00.0

bxp:CAColoradoCenterLimitedPartnership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value251252250254252253253253254254263514512510507
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures18.226.426.827.125.926.527.437.238.141.043.162.864.665.965.4
Percentage of Assets1.21.21.21.21.21.31.31.31.31.31.42.72.72.72.7
Percentage of Assets bxp:CAColoradoCenterLimitedPartnership0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:FiveFourZeroMadisonVentureLlc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value2239666666666666676867676968676869686768706969
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures0.20.30.31.06.86.97.29.79.910.711.08.38.58.79.027.228.729.331.932.734.635.239.139.454.2
Percentage of Assets0.00.00.00.00.30.30.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.30.40.40.4
Percentage of Assets bxp:FiveFourZeroMadisonVentureLlc0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:FivezerooneKStreetLLC



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value42424242424242424242424242424242424241
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures3.14.44.64.54.44.54.66.26.46.96.95.25.35.55.516.818.018.121.6
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets bxp:FivezerooneKStreetLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:GatewayCommonsComplex



Period End2020-03-31
Value348
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures25.3
Percentage of Assets1.6
Percentage of Assets bxp:GatewayCommonsComplex0.0

bxp:HotelTowerDeveloperLLC



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value99333322111110
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures0.71.00.40.40.30.30.30.30.30.30.30.20.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets bxp:HotelTowerDeveloperLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:OneTwoSixFiveMainOfficeJVLLC



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value333443444444442321161142
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures0.30.40.40.40.40.40.50.60.70.70.80.60.60.63.18.66.85.11.91.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.00.0
Percentage of Assets bxp:OneTwoSixFiveMainOfficeJVLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:OnehundredCausewayStreet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value575674694623120
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures4.15.97.97.44.82.51.30.0
Percentage of Assets0.30.30.30.30.20.10.10.0
Percentage of Assets bxp:OnehundredCausewayStreet0.00.00.00.00.00.00.00.0

bxp:PlatformSixteen



Period End2020-03-312019-12-312019-09-302018-12-31
Value9329290
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures6.83.13.10.0
Percentage of Assets0.40.10.10.0
Percentage of Assets bxp:PlatformSixteen0.00.00.00.0

bxp:PodiumDeveloperLLC



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value4949415869696872676755453629332723189654
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures3.65.24.46.37.27.27.410.710.210.89.15.64.63.94.411.010.17.94.43.12.82.2
Percentage of Assets0.20.20.20.30.30.30.30.40.30.30.30.20.20.20.20.10.10.10.10.00.00.0
Percentage of Assets bxp:PodiumDeveloperLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:ResidentialTowerDeveloperLLC



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value5455484847474638292825232120
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures4.05.85.25.14.95.05.05.74.54.64.22.92.72.7
Percentage of Assets0.20.30.20.20.20.20.20.20.20.10.10.10.10.1
Percentage of Assets bxp:ResidentialTowerDeveloperLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:SantaMonicaBusinessPark



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value1511631631691751801830
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures11.017.217.618.018.018.919.80.0
Percentage of Assets0.70.80.80.80.90.90.90.0
Percentage of Assets bxp:SantaMonicaBusinessPark0.00.00.00.00.00.00.00.0

bxp:SevensevenfivezeroWisconsinAvenueLLC



Period End2020-03-312019-12-312018-12-312017-12-31
Value57566921
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures4.15.97.33.5
Percentage of Assets0.30.30.30.1
Percentage of Assets bxp:SevensevenfivezeroWisconsinAvenueLLC0.00.00.00.0

bxp:ThreeHudsonBoulevard



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value846754474746460
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures6.17.15.85.14.94.95.00.0
Percentage of Assets0.40.30.30.20.20.20.20.0
Percentage of Assets bxp:ThreeHudsonBoulevard0.00.00.00.00.00.00.00.0

bxp:WpProjectDeveloperLlc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value36363737373838393939404041414242434344444545464646
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures2.63.84.04.03.94.04.25.75.96.46.65.05.25.45.416.818.318.520.321.223.123.525.526.336.9
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets bxp:WpProjectDeveloperLlc0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Long Term Debt

us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebt

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302012-12-31
Value120611181111838118461100511007108891072110339102711023410236970696169628975499809036972998679886990610475105581057711341113658912
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets55.355.555.655.753.754.354.153.752.853.053.053.151.251.051.251.452.049.251.351.651.549.855.555.955.756.358.457.6
Percentage of Assets us-gaap:CarryingReportedAmountFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302012-12-31
Value1225412311124021225911033108741074510626103341054910582105729948982810182103731048893571015110310104841040110943110871103311657117769697
Percentage of LongTermDebt101.6104.2104.8103.5100.398.898.799.1100.0102.7103.4103.3102.5102.2105.8106.3105.1103.6104.3104.5106.0105.0104.5105.0104.3102.8103.6108.8
Percentage of Assets56.157.858.357.653.853.753.453.252.854.554.854.852.552.154.254.754.750.953.553.954.752.358.058.758.157.860.562.7
Percentage of Assets us-gaap:EstimateOfFairValueFairValueDisclosure0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value60475684567157155836588358765892587958135825581457755786572557325749570958515782578256975725569157025741562452565097511951344963486548254757469643724446
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets27.726.726.626.928.529.029.229.530.030.030.230.230.530.730.530.230.031.130.830.330.128.630.330.130.028.528.933.633.033.833.634.932.934.534.333.932.836.0

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value11111111111111111111111111111111111111
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:RestrictedStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-31
Value333332222444422224444222233322221111420
Percentage of CommonStockValue225.4226.1226.4226.4194.2155.3155.4155.4142.5317.6317.6317.6305.6162.5162.5162.7136.7312.5312.5312.7286.8169.8169.8169.8150.3254.9255.9244.1145.1145.8146.0140.6121.5122.0123.0110.3321.0201.60.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:RestrictedStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-416-760-749-710-728-675-677-649-654-712-692-694-712-693-725-702-699-780-627-711-690-762-148-176-153-108192-160-109-59-34-70-53-72-69-56-2495
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.9-3.6-3.5-3.3-3.6-3.3-3.4-3.3-3.3-3.7-3.6-3.6-3.8-3.7-3.9-3.7-3.6-4.2-3.3-3.7-3.6-3.8-0.8-0.9-0.8-0.51.0-1.0-0.7-0.4-0.2-0.5-0.4-0.5-0.5-0.4-0.20.8

Treasury Stock Value

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-55-48-51-51-48-47-45-47-49-50-51-53-50-52-73-79-56-14-201-11-9-9-10-10-11-12-13-13-14-14-15-16-16-17-17-18-21
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.3-0.1-0.10.0-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-55-48-51-51-48-47
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.3-0.2-0.2-0.2-0.2-0.2
Percentage of Assets srt:Subsidiaries-0.3-0.2-0.2-0.2-0.2-0.2

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value17536125435820737920933522531422012524629315923534819016524120122516018412422723713216913260
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax23.347.734.248.82318.653.830.650.42480.548.033.519.139.046.125.537.752.430.526.339.132.636.826.031.321.639.549.228.237.831.715.9

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value175361254358207379209335225
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax23.347.734.248.82318.653.830.650.42480.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-73-278-408-104-223-78-534-302-183-275-82-276-262-224-678-316-109-6792191762-176-141-199-147-79-432-213-760-121-152
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-9.8-36.8-54.9-14.2-2500.7-11.2-77.8-45.5-2019.2-42.0-12.6-42.1-41.5-35.3-108.6-50.7-16.4-108.834.928.50.4-28.8-22.9-33.8-25.6-13.7-89.6-45.4-169.8-29.0-40.5

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-73-278-408-104-223-78-534-302-183
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-9.8-36.8-54.9-14.2-2500.7-11.2-77.8-45.5-2019.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value65-195-203476-190-8521238-92-97-136340-37-130-241-344642-174-341-139-902867-208-128-116257562-367-641257-135
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.7-25.8-27.465.0-2132.6-12.13.135.9-1013.3-14.9-20.851.9-6.0-20.6-38.6-55.396.4-28.0-54.2-22.6-146.0141.3-33.8-21.8-202.399.913.0-78.1-143.261.5-35.9

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value65-195-203476-190-8521238-92
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.7-25.8-27.465.0-2132.6-12.13.135.9-1013.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value17536125435820737920933522531422012524629315923534819016524120122516018412422723713216913260
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax23.347.734.248.82318.653.830.650.42480.548.033.519.139.046.125.537.752.430.526.339.132.636.826.031.321.639.549.228.237.831.715.9

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value175361254358207379209335225
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax23.347.734.248.82318.653.830.650.42480.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-06-302012-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value500140110166100148121131178103119136991477999184137186821731741307956881524554865571191184864101706040-1257615253656744
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax66.518.614.822.81127.021.117.719.81962.715.818.220.815.823.112.715.927.722.129.613.328.128.421.113.49.915.426.788.39.913.712.325.225.211.014.422.415.613.89.8-3.314.915.613.914.217.517.311.8

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value568158124188116173138148203
Percentage of NetIncomeLoss113.8112.8113.0112.8115.2117.0114.0113.2113.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax75.621.016.825.71297.924.720.222.42236.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value577176141203131185150160216132147167115164711172161663231002092111509567106170506576613413474806948687262
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax76.723.219.027.71467.426.321.924.22376.520.222.525.418.325.911.418.832.526.751.316.333.834.524.416.311.818.529.898.312.014.028.528.516.517.816.011.517.618.416.5

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value30239316-1844621096643456659554170-2-2-1181823825385
Percentage of ProfitLoss0.60.21.619.22.39.0-12.13.12.14.91.96.17.94.09.53.81.62.61.76.33.02.86.06.18.14.310.30.0-3.8-1.713.54.047.73.611.65.411.59.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.10.35.334.22.4-2.70.849.31.00.41.51.41.01.10.70.50.70.91.01.01.01.51.01.00.83.10.00.0-0.5-0.23.83.90.78.50.61.30.92.11.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax bxp:UnconsolidatedJointVentures0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value588177143205134192153162220
Percentage of ProfitLoss102.0101.0101.3101.2102.8104.1102.1101.5102.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax78.223.519.328.11508.627.422.424.52425.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value17116916517716416515715616515415215115917820315315916415316715416215715415415512111110910983
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value169168164175162163156154163
Percentage of DepreciationDepletionAndAmortization98.998.998.998.898.898.898.898.898.8

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-73-278-408-104-223-78-534-302-183-275-82-276-262-224-678-316-109-6792191762-176-141-199-147-79-432-213-760-121-152
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-9.8-36.8-54.9-14.2-2500.7-11.2-77.8-45.5-2019.2-42.0-12.6-42.1-41.5-35.3-108.6-50.7-16.4-108.834.928.50.4-28.8-22.9-33.8-25.6-13.7-89.6-45.4-169.8-29.0-40.5

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-73-278-408-104-223-78-534-302-183
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-9.8-36.8-54.9-14.2-2500.7-11.2-77.8-45.5-2019.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value65-195-203476-190-8521238-92-97-136340-37-130-241-344642-174-341-139-902867-208-128-116257562-367-641257-135
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.7-25.8-27.465.0-2132.6-12.13.135.9-1013.3-14.9-20.851.9-6.0-20.6-38.6-55.396.4-28.0-54.2-22.6-146.0141.3-33.8-21.8-202.399.913.0-78.1-143.261.5-35.9

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value65-195-203476-190-8521238-92
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.7-25.8-27.465.0-2132.6-12.13.135.9-1013.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:Subsidiaries0.00.00.00.00.00.00.00.00.0

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value17116616616616616614014014013113113113111411411432811411411488311311311649611311093928180
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value171166166166166166140140140
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends

us-gaap:PaymentsOfDividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value17116616616616616614014014013113113113111411411432811411411488311311311649611311093928180
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value171166166166166166140140140
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0

Debt Instrument Interest Rate Stated Percentage

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number

Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price

Share Based Compensation

us-gaap:ShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value1777101588814888107771066511556106256111114
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1777101588814
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312019-01-012018-12-31
Value1481481491491511510
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.00.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-31
Value1112
Percentage of OperatingLeaseRightOfUseAsset8.08.1

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1481481491491510
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.00.0

Cash And Cash Equivalents Period Increase Decrease

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value8586918041162432639423727455505576539354420797
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value8586918041162432639423727455505420
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:AboveAndBelowMarketRentAdjustments

bxp:ColoradoCenter



Period End2020-03-312019-03-312016-12-312016-09-30
Value300000.0400000.0-400000.0-500000.0
Percentage of AboveAndBelowMarketRentAdjustments100.0100.0100.0100.0

bxp:Accruedrentalincomenetdeconsolidated



Period End2020-03-312019-03-31
Value40
Percentage of Accruedrentalincomenetdeconsolidated100.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-03-31
Value40
Percentage of Accruedrentalincomenetdeconsolidated100.00.0

bxp:Allocationofundistributedearningstoparticipatingsecuritiesinshares



Period End2020-03-312019-06-302018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-09-302013-06-30
Value0.00.00.00.00.00.00.00.00.00.00.00.00.0-0.03
Percentage of Allocationofundistributedearningstoparticipatingsecuritiesinshares0.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

bxp:Allocationofundistributedearningstoparticipatingsecuritiespershares



Period End2020-03-312019-06-302018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-09-302013-06-30
Value-0.010.00.00.00.00.00.00.00.00.00.00.00.0-0.03
Percentage of Allocationofundistributedearningstoparticipatingsecuritiespershares100.00.00.00.00.00.00.00.00.00.00.00.00.0100.0

bxp:Amortizationofrightofuseassetoperatingleases



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value583000.0591000.0608000.0608000.0605000.00.0
Percentage of Amortizationofrightofuseassetoperatingleases100.0100.0100.0100.0100.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-30
Value583000.0591000.0608000.0608000.0605000.00.0
Percentage of Amortizationofrightofuseassetoperatingleases100.0100.0100.0100.0100.00.0

dei:LegalEntity

bxp:CompanysShareOfNetIncomeLoss

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value1002217-22162443321222142422230-1-1-110101-23-2-3
Percentage of CompanysShareOfNetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:ConversionsOfNoncontrollingInterestsToStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value153000000000150033028-3-2-800-10-19046290
Percentage of ConversionsOfNoncontrollingInterestsToStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1530000000
Percentage of ConversionsOfNoncontrollingInterestsToStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

bxp:DistributionsMadeToMYLTIPUnitsPerUnit

srt:Subsidiaries



Period End2020-01-302019-10-312019-07-312019-04-302019-01-302018-10-312018-07-312018-04-302018-01-30
Value0.0980.0950.0950.0950.0950.0950.080.080.08
Percentage of DistributionsMadeToMYLTIPUnitsPerUnit100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:EarningsPerShareAfterAllccationofUndistributedEarningstoParticiaptingSecuritiesBasicdollarspershare



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value3.21.060.630.96999999999999980.77000000000000020.831.140.760.870.960.50.63000000000000011.181.20.50999999999999981.120.83
Percentage of EarningsPerShareAfterAllccationofUndistributedEarningstoParticiaptingSecuritiesBasicdollarspershare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.281.080.661.00999999999999980.790.851.17
Percentage of EarningsPerShareAfterAllccationofUndistributedEarningstoParticiaptingSecuritiesBasicdollarspershare102.5101.9104.8104.1102.6102.4102.6

bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

bxp:EmployeeAndDirectorPaymentPerShare

bxp:LTIPand2014MYLTIPUnits



Period End2020-03-312014-12-312014-09-30
Value0.250.00.0
Percentage of EmployeeAndDirectorPaymentPerShare100.00.00.0

us-gaap:RestrictedStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-09-302012-03-312011-03-31
Value0.010.00.00.00.010.00.00.00.010.00.00.00.010.00.00.00.010.00.00.00.010.00.00.00.010.010.00.010.01
Percentage of EmployeeAndDirectorPaymentPerShare4.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

bxp:EquityProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-577-1127141203131-1239150160216132147167115164711172161663229820620914890651025465734761
Percentage of EquityProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-19-125181718-109141417
Percentage of EquityProfitLoss3.411.213.18.614.48.89.99.08.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-57-102121911-2251314372527301515-7183126135163331181181067868
Percentage of EquityProfitLoss10.09.18.89.48.818.29.29.317.419.518.818.413.79.1-11.015.514.715.742.116.616.015.212.112.913.410.312.311.411.713.814.4

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-500-899110166100-1014121131178106119136991497999184140186821731771307956914857644052
Percentage of EquityProfitLoss86.779.878.182.176.881.880.981.882.680.581.281.686.390.9111.084.585.384.357.983.484.084.887.987.186.689.787.788.688.386.285.6

us-gaap:StatementEquityComponents

bxp:Finalawardspercentageoftarget

bxp:MYLTIPtwothousandseventeen



Period End2020-02-06
Value0.838
Percentage of Finalawardspercentageoftarget100.0

us-gaap:SubsequentEventType, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:SubsequentEvent, bxp:MYLTIPtwothousandseventeen



Period End2020-02-06
Value0.838
Percentage of Finalawardspercentageoftarget100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

bxp:Futurepaymenttoacquireinterestinequitymethodinvestment

bxp:GatewayCommonsComplex, bxp:JointVenturePartner



Period End2020-01-28
Value69
Percentage of Futurepaymenttoacquireinterestinequitymethodinvestment100.0

dei:LegalEntity

bxp:IncomeStatementBasisDifferential

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-1-1-125-1-1-1-1-1-2-2-1-10-1000000000000-20000002511322
Percentage of IncomeStatementBasisDifferential100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value43-1013700036001340013200142000260250262418
Percentage of IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.00.00.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

bxp:IssuanceOfRestrictedUnitsToEmployeesAndDirectors

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value43-1013700036
Percentage of IssuanceOfRestrictedUnitsToEmployeesAndDirectors100.0100.00.0100.0100.0100.00.0100.0100.0

us-gaap:Range, us-gaap:SubsequentEventType, bxp:PerformanceIndex, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

bxp:MaximumEarnedAwards

srt:Maximum, us-gaap:SubsequentEvent, bxp:NareitOfficeIndexAdjusted, bxp:TwothousandtwentyMYLTIPSMember



Period End2020-02-04
Value203278.0
Percentage of MaximumEarnedAwards100.0

us-gaap:Range, us-gaap:SubsequentEventType, bxp:PerformanceIndex, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

bxp:Minimumearnedawards

srt:Minimum, us-gaap:SubsequentEvent, bxp:NareitOfficeIndexAdjusted, bxp:TwothousandtwentyMYLTIPSMember



Period End2020-02-04
Value0.0
Percentage of Minimumearnedawards0.0

us-gaap:StatementEquityComponents

bxp:NetIncomeAllocableToGeneralAndLimitedPartnerUnits

bxp:BostonPropertiesLimitedParntership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value508142109166101156122131180
Percentage of NetIncomeAllocableToGeneralAndLimitedPartnerUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value530161130186123175139148200
Percentage of NetIncomeAllocableToGeneralAndLimitedPartnerUnits104.3113.3119.2112.1121.1112.2114.3113.0111.0

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value571612191117131420
Percentage of NetIncomeAllocableToGeneralAndLimitedPartnerUnits11.311.411.411.411.411.311.311.411.3

bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value191618171816141417
Percentage of NetIncomeAllocableToGeneralAndLimitedPartnerUnits3.811.516.910.518.510.512.111.09.5

bxp:NetIncomeLossAvailableToCommonStockholdersAfterAllocationofUndistributedEarningstoParticipatingSecuritiesBasic



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value49616498148119128175117133147769618118379170127
Percentage of NetIncomeLossAvailableToCommonStockholdersAfterAllocationofUndistributedEarningstoParticipatingSecuritiesBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value565185113173136145200
Percentage of NetIncomeLossAvailableToCommonStockholdersAfterAllocationofUndistributedEarningstoParticipatingSecuritiesBasic113.8113.0115.6117.1114.3113.4114.1

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

bxp:NetOperatingIncome

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-03-31
Value452425
Percentage of NetOperatingIncome100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value452425429411406401403401410390394382392432393396390
Percentage of NetOperatingIncome100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType

bxp:Numberofbuildings

bxp:NewDominionTechnologyPark, us-gaap:SubsequentEvent



Period End2020-02-20
Value2.0
Percentage of Numberofbuildings100.0

us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

bxp:NewDominionTechnologyPark



Period End2020-02-20
Value2.0
Percentage of Numberofbuildings100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:GatewayCommonsComplex



Period End2020-01-28
Value3.0
Percentage of Numberofbuildings0.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

bxp:GatewayCommonsComplex, bxp:JointVenturePartner



Period End2020-01-28
Value3.0
Percentage of Numberofbuildings0.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

bxp:GatewayCommonsComplex, us-gaap:SubsequentEvent



Period End2020-01-28
Value3.0
Percentage of Numberofbuildings0.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType, dei:LegalEntity

bxp:GatewayCommonsComplex, us-gaap:SubsequentEvent, bxp:JointVenturePartner



Period End2020-01-28
Value3.0
Percentage of Numberofbuildings0.0

bxp:PercentageOfTotalNetOperatingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.01.01.01.01.01.01.01.01.01.01.0
Percentage of PercentageOfTotalNetOperatingIncome100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value0.33850.00370000000000003660.32840.32580.3138-0.00079999999999996740.33460.33690.31470.0063999999999999610.3140.29990.28470.00409999999999999250.30620.29530.25180.00209999999999999080.28450.29920.2648-0.00200000000000000180.30.31360.2969-0.0052999999999999710.31050.34350.34450.35870.35710.35820.32560.32770.33440.3208
Percentage of PercentageOfTotalNetOperatingIncome33.90.032.832.631.40.033.533.731.50.031.430.028.50.030.629.525.20.028.429.926.50.030.031.429.70.031.134.434.435.935.732.632.833.432.1

bxp:SanFrancisco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value0.19970.00229999999999999650.1980.19330.18520.00409999999999999250.16520.15310.1551-9.999999999998899e-050.15050.1450.15410.0037000000000000090.14180.13530.12120.00209999999999999080.12980.12790.12780.00160000000000000420.11230.11040.1131-0.00120000000000000660.10660.11330.11170.11340.11050.10780.11650.11780.12390.1269
Percentage of PercentageOfTotalNetOperatingIncome20.00.019.819.318.50.016.515.315.50.015.014.515.40.014.213.512.10.013.012.812.80.011.211.011.30.010.711.311.211.311.111.711.812.412.7

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value0.13070.1399-0.00229999999999999650.17520.1921
Percentage of PercentageOfTotalNetOperatingIncome13.114.00.017.519.2

stpr:NY



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302013-09-30
Value0.3311-0.00470000000000003750.33540.34060.3611-0.00180000000000002380.34290.34960.3702-0.0069000000000000170.36470.38650.384-0.0091999999999999860.37210.39590.46950.002699999999999980.41250.3908
Percentage of PercentageOfTotalNetOperatingIncome33.10.033.534.136.10.034.335.037.00.036.538.638.40.037.239.646.90.041.239.1

bxp:PercentageOfTotalRentalExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value1.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.01.01.01.01.01.01.01.0
Percentage of PercentageOfTotalRentalExpenses100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value0.33620.00139999999999995680.33270.32960.3337-0.00200000000000000180.3430.35120.3579-0.000200000000000033480.3460.34790.35190.00090000000000001190.34020.34190.3476-0.00309999999999999170.35320.35280.3692-0.0056999999999999830.35470.35920.3768-0.0085999999999999970.36940.38760.41750.42310.41040.41210.40890.39730.39250.3861
Percentage of PercentageOfTotalRentalExpenses33.60.033.333.033.40.034.335.135.80.034.634.835.20.034.034.234.80.035.335.336.90.035.535.937.70.036.938.841.842.341.040.939.739.238.6

bxp:SanFrancisco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value0.15780.00220000000000000750.16730.16370.1550.0047999999999999990.13250.12660.11120.00219999999999999360.1090.10860.1040.00.110.11270.10540.00100000000000000090.11360.10950.09970.00060000000000000330.10710.10760.0963-0.00119999999999999270.10340.11960.11080.12360.1260.12240.12290.13010.13420.133
Percentage of PercentageOfTotalRentalExpenses15.80.016.716.415.50.013.212.711.10.010.910.910.40.011.011.310.50.011.410.910.00.010.710.89.60.010.312.011.112.412.612.313.013.413.3

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value0.13850.1459-0.00100000000000000090.16860.1709
Percentage of PercentageOfTotalRentalExpenses13.914.60.016.917.1

stpr:NY



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302013-09-30
Value0.3675-0.00329999999999996960.35970.36250.3654-0.00250000000000000220.37680.37260.3775-0.00209999999999999080.38970.38980.3895-0.00119999999999997890.40170.39290.39150.006100000000000050.36960.3563
Percentage of PercentageOfTotalRentalExpenses36.80.036.036.236.50.037.737.337.80.039.039.039.00.040.239.339.10.037.035.6

bxp:PercentageOfTotalRevenue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.00.01.01.01.01.01.01.01.01.01.01.01.01.01.0
Percentage of PercentageOfTotalRevenue100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value0.33770.00280000000000002470.330.32720.3212-0.00120000000000003440.33780.34230.33120.00400000000000000360.32610.31760.310.00300000000000000270.31920.31240.28480.00010000000000004450.30960.31870.3038-0.0034000000000000140.31990.330.3268-0.0066999999999999840.33190.35980.37220.38320.37650.37780.35660.35290.35490.3439
Percentage of PercentageOfTotalRevenue33.80.033.032.732.10.033.834.233.10.032.631.831.00.031.931.228.50.031.031.930.40.032.033.032.70.033.236.037.238.337.635.735.335.534.4

bxp:SanFrancisco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value0.18440.00220000000000000750.18650.18230.1740.0043999999999999870.15260.14310.13830.00079999999999999520.13470.13160.13530.00229999999999999650.12960.12710.11570.00169999999999999320.12390.12120.11730.00120000000000000660.11040.10940.1068-0.00109999999999998990.10540.11560.11140.11730.11610.11310.11890.12230.12750.1291
Percentage of PercentageOfTotalRevenue18.40.018.618.217.40.015.314.313.80.013.513.213.50.013.012.711.60.012.412.111.70.011.010.910.70.010.511.611.111.711.611.912.212.812.9

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value0.13360.1421-0.0017999999999999960.17280.1844
Percentage of PercentageOfTotalRevenue13.414.20.017.318.4

stpr:NY



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302013-09-30
Value0.3443-0.00409999999999999250.34450.34870.3627-0.00209999999999999080.3560.35830.3731-0.0051999999999999820.37430.38770.386-0.0063000000000000280.38340.39470.44270.00400000000000000360.39690.3783
Percentage of PercentageOfTotalRevenue34.40.034.434.936.30.035.635.837.30.037.438.838.60.038.339.544.30.039.737.8

bxp:PercentageofCompanysShareofNetOperatingIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.00.01.01.01.00.01.01.01.0
Percentage of PercentageofCompanysShareofNetOperatingIncome100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.3360.00400000000000000360.3260.32010.3096-0.00250000000000000220.33290.34060.3196
Percentage of PercentageofCompanysShareofNetOperatingIncome33.60.032.632.031.00.033.334.132.0

bxp:LosAngeles



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0352-0.00019999999999999880.03390.03570.03690.00369999999999999840.03390.01820.019
Percentage of PercentageofCompanysShareofNetOperatingIncome3.50.03.43.63.70.03.41.81.9

bxp:SanFrancisco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.2150.00229999999999999650.20860.20260.19360.00339999999999998640.17390.16420.168
Percentage of PercentageofCompanysShareofNetOperatingIncome21.50.020.920.319.40.017.416.416.8

stpr:DC



Period End2020-03-312019-03-31
Value0.1490.1637
Percentage of PercentageofCompanysShareofNetOperatingIncome14.916.4

stpr:NY



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.2648-0.00409999999999999250.27050.2790.2962-0.00219999999999997970.27640.28730.3023
Percentage of PercentageofCompanysShareofNetOperatingIncome26.50.027.127.929.60.027.628.730.2

us-gaap:ConsolidatedEntities

bxp:RedeemableCommonUnits

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1701717170171717
Percentage of RedeemableCommonUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:RentalExpensesClassOffice



Period End2020-03-312019-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value258253226222226216217211214209213203206194198190192173167163156155151148140136
Percentage of RentalExpensesClassOffice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value8279757271687067706774646965716467636565606057555047
Percentage of RentalExpensesClassOffice31.931.333.232.431.531.832.532.132.732.534.831.933.433.836.033.935.036.539.340.038.638.337.336.235.2

bxp:SanFrancisco



Period End2020-03-312019-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value4241242526252324242321222221191920211921212020202019
Percentage of RentalExpensesClassOffice16.416.210.811.411.511.811.011.411.611.210.310.910.910.99.710.410.412.311.913.313.513.314.014.414.2

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value3436363231
Percentage of RentalExpensesClassOffice13.414.218.215.916.5

stpr:NY



Period End2020-03-312019-03-312017-03-312016-03-312014-12-312014-09-302013-09-30
Value99969188838273
Percentage of RentalExpensesClassOffice38.338.240.440.841.239.838.2

bxp:RentalExpensesOperatingExpensesTotal



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value269277274267265261256246248242245238235231236225226224227222228218222209213206205187179175168167163159149145
Percentage of RentalExpensesOperatingExpensesTotal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value909391888889888688848583828080777877807884747975807476727574696966635856
Percentage of RentalExpensesOperatingExpensesTotal33.633.733.333.033.434.334.335.135.834.834.634.835.234.734.034.234.834.635.335.336.934.135.535.937.736.136.938.841.742.341.040.939.739.238.6

bxp:SanFrancisco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value424745434137343127282625242526252325252422232322202121221921212020202019
Percentage of RentalExpensesOperatingExpensesTotal15.817.016.716.415.514.213.212.711.111.610.910.910.410.911.011.310.511.211.411.010.010.610.710.89.610.310.312.011.112.412.612.313.013.413.3

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value3738373735
Percentage of RentalExpensesOperatingExpensesTotal13.914.617.016.917.1

stpr:NY



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302013-09-30
Value9997989696959691939295939190958888838273
Percentage of RentalExpensesOperatingExpensesTotal36.735.036.036.336.536.637.737.337.738.139.039.039.039.140.239.339.238.337.035.6

bxp:RentalExpensesResidential



Period End2020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value43332211111211111344333222222220
Percentage of RentalExpensesResidential100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-30
Value1111000000010000000000000000000
Percentage of RentalExpensesResidential33.032.033.931.124.222.632.032.533.331.932.451.331.932.531.031.633.414.411.212.213.811.913.916.014.416.217.214.314.411.2

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value22332
Percentage of RentalExpensesResidential67.068.088.887.884.0

bxp:RentalRevenueClassOffice



Period End2020-03-312019-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value724696614611602601646588592581582573577548539537534475450438438436415421406392360355351
Percentage of RentalRevenueClassOffice100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value239217185186183179177174173174169171176173170170170164161161157157140141135127
Percentage of RentalRevenueClassOffice33.031.230.230.530.629.827.529.629.330.129.229.830.631.631.731.831.934.635.836.836.033.933.433.432.4

bxp:SanFrancisco



Period End2020-03-312019-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value136124848380787673716866636157545453535254535252535452
Percentage of RentalRevenueClassOffice18.917.813.813.713.313.111.812.512.111.811.411.110.710.510.110.210.111.211.712.412.212.612.813.313.5

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value93961089696
Percentage of RentalRevenueClassOffice12.913.819.016.718.0

stpr:NY



Period End2020-03-312019-03-312017-03-312016-03-312014-12-312014-09-302013-09-30
Value255258241291244243214
Percentage of RentalRevenueClassOffice35.237.139.345.142.642.140.1

bxp:RentalRevenueResidential



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value910987764444434444443677655555555420
Percentage of RentalRevenueResidential100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-30
Value4433221111111111111111111111101100
Percentage of RentalRevenueResidential40.939.738.135.835.033.630.124.927.729.628.627.428.829.528.128.928.929.631.029.717.215.816.217.320.519.720.519.419.118.120.119.711.6

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value55654
Percentage of RentalRevenueResidential59.165.084.283.879.5

bxp:RentalRevenueTotal



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value741744730721713690668653649645646649625626618618659617623613613606612583569568566507469461
Percentage of RentalRevenueTotal100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementGeographical

bxp:Boston



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value250251241236229229225223215215210206193198197193187192193195186189195192186187187182175174
Percentage of RentalRevenueTotal33.833.733.032.732.133.233.834.233.133.432.631.831.031.731.931.228.531.131.031.930.431.232.033.032.733.033.236.037.537.8

bxp:SanFrancisco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value1361411361311241111029389888785848380787678777471696763606059585252
Percentage of RentalRevenueTotal18.419.018.618.217.416.215.314.313.813.713.513.213.513.313.012.711.612.812.412.111.711.411.010.910.710.710.511.611.311.3

stpr:DC



Period End2020-03-312019-03-312014-12-312014-09-302013-09-30
Value99101103105104
Percentage of RentalRevenueTotal13.414.217.117.318.4

stpr:NY



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-12-312014-09-302013-09-30
Value255249251251258244237234242233242251241239237243291244243214
Percentage of RentalRevenueTotal34.433.634.534.936.335.435.635.837.336.237.438.838.638.238.339.544.340.339.737.8

bxp:TransferOfTenantImprovementsRealEstate



Period End2020-03-312019-03-31
Value120
Percentage of TransferOfTenantImprovementsRealEstate100.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-03-31
Value120
Percentage of TransferOfTenantImprovementsRealEstate100.00.0

bxp:TransferOfTenantLeaseCostsRealEstate



Period End2020-03-312019-03-31
Value30
Percentage of TransferOfTenantLeaseCostsRealEstate100.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-03-31
Value30
Percentage of TransferOfTenantLeaseCostsRealEstate100.00.0

bxp:WeightedAverageNumberDilutedSharesOutstandingAdjustmentpershare



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.00.00.00.00.0-0.010.00.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustmentpershare0.00.00.00.00.0100.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-0.010.00.00.00.0-0.010.00.0
Percentage of WeightedAverageNumberDilutedSharesOutstandingAdjustmentpershare0.00.00.00.00.0100.00.00.0

bxp:WeightedAverageNumberOfSharesOutstandingAfterAllocationofUndistributedEarningstoParticipatingSecuritiesBasicinshares



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value155154154001541541541540001531530153153
Percentage of WeightedAverageNumberOfSharesOutstandingAfterAllocationofUndistributedEarningstoParticipatingSecuritiesBasicinshares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value17217217200171171
Percentage of WeightedAverageNumberOfSharesOutstandingAfterAllocationofUndistributedEarningstoParticipatingSecuritiesBasicinshares111.3111.4111.461.585.7111.3111.3

bxp:Writeoffoffullydepreciatedrealestate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value384325293135214929-228173649-3751163517-7815
Percentage of Writeoffoffullydepreciatedrealestate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value384225293135214929
Percentage of Writeoffoffullydepreciatedrealestate100.098.7100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

dei:EntityListingParValuePerShare

bxp:A5.25SeriesBCumulativeRedeemablePreferredStockparvalue0.01pershare



Period End2020-03-312019-12-312019-09-30
Value0.010.00.0
Percentage of EntityListingParValuePerShare100.00.00.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-30
Value0.010.00.0
Percentage of EntityListingParValuePerShare100.00.00.0

us-gaap:AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-4011851121547619459174918272-411301288811713223-157140-71498856121179669584-2
Percentage of AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-41318311015272186561725
Percentage of AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities102.899.098.498.595.296.194.698.652.9

us-gaap:AllocatedShareBasedCompensationExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1777101477714777107779555105569566256661055116613
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:AssetImpairmentCharges

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0000-22-10000
Percentage of AssetImpairmentCharges0.00.00.00.0100.0100.00.00.00.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-302012-03-31
Value0000-24-110000000000800
Percentage of AssetImpairmentCharges0.00.00.00.0107.9116.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-27-6-196549-33-12
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-27-6-19654956-12
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0-170.9100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value166-112-358730-206215-303271-50-7137185-65
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value166-112-358730-206215-303271-50
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareCashPaid



Period End2020-01-302019-10-312019-07-312019-04-302019-01-302018-10-312018-07-312018-04-302018-01-302017-10-312017-07-312017-04-282017-01-302016-10-312016-07-292016-04-292016-01-282015-10-302015-07-312015-04-302015-01-282014-10-312014-07-302014-04-302014-01-292013-10-312013-07-312013-04-302013-01-292012-10-312012-07-312012-07-312012-04-302012-04-302012-01-272012-01-272011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value0.980.950.950.950.950.950.80.80.80.750.750.750.750.650.650.651.90.650.650.655.150.650.650.652.90.650.650.650.650.550.550.550.550.550.550.550.50.50.50.50.50.50.50.5
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-01-302019-10-312019-07-312019-04-302019-01-302018-10-312018-07-312018-04-302018-01-30
Value0.980.950.950.950.950.950.80.80.8
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CumulativeEffectOnRetainedEarningsNetOfTax1



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1000-40005000-2
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax1100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:StatementEquityComponents

bxp:BostonPropertiesLimitedParntership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1000-30004
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax189.60.00.00.088.20.00.00.089.8

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1000-30004
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax189.60.00.00.089.80.00.00.089.8

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-174000.00.00.00.0-445000.00.00.00.0563000.0
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax110.40.00.00.010.20.00.00.010.2

bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.00.00.0-70000.0
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax1-0.00.00.00.01.6

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value000000000000-1
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax110.40.00.00.010.20.00.00.010.20.00.00.086.6

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-1000-300040000
Percentage of CumulativeEffectOnRetainedEarningsNetOfTax189.60.00.00.088.20.00.00.089.80.00.00.013.4

us-gaap:DepreciationAndAmortization



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value171169165177164165157156165154152151159178203153159164153167154162157154154154153134120111111111109109111109818183
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value32252324282844141412161414141299988999999927393939-424241464850505756
Percentage of DepreciationAndAmortization18.714.914.214.017.417.428.59.38.97.810.89.49.08.25.96.05.75.65.85.35.95.86.05.95.96.46.420.232.635.3-38.238.242.743.446.362.370.568.4

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value169168164175162163156154163
Percentage of DepreciationAndAmortization98.998.998.998.898.898.898.898.898.8

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-169-168-164-175-162-163-156-154-163
Percentage of DepreciationAndAmortization-98.9-98.9-98.9-98.8-98.8-98.8-98.8-98.8-98.8

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value-171-169-165-177-164-165-157-156-165-154-152-151-159-178-203-153159164153167154162157154154154153134120111111111108108110
Percentage of DepreciationAndAmortization-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.098.999.399.3

us-gaap:DirectCostsOfLeasedAndRentedPropertyOrEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value262268265257257253247237240233237230228224228217219216219214221211215202206198199179172168161161157154144139128123124
Percentage of DirectCostsOfLeasedAndRentedPropertyOrEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value262268265257257253247237240
Percentage of DirectCostsOfLeasedAndRentedPropertyOrEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss

bxp:GatewayCenter



Period End2020-01-272019-03-31
Value02
Percentage of DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss100.0100.0

bxp:NewDominionTechnologyPark



Period End2020-02-192019-03-31
Value12
Percentage of DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss0.072.4

us-gaap:Dividends



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value17217116616616616616614014014013113113113111411411432811411411488311311311349511092928280
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-03-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value1717171717171714141413131313111111111110101010
Percentage of Dividends10.110.310.310.310.310.210.210.210.210.110.110.110.410.310.310.410.49.910.410.810.912.213.4

us-gaap:RetainedEarnings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value1541541491491491491491261261261181181181181021021022941021021027911021021024469882827269
Percentage of Dividends89.989.789.789.789.789.889.889.889.889.989.989.989.689.789.789.689.689.689.789.689.789.589.789.990.190.089.689.289.187.886.6

us-gaap:EquityMethodInvestmentDividendsOrDistributions



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value5012122200185111300101041400121212870
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5012122200
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeasePrincipalPayments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.00.0-126000.0158000.0470000.00.00.00.00.0
Percentage of FinanceLeasePrincipalPayments0.00.0100.0100.0100.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.00.0-126000.0158000.0470000.00.00.00.0
Percentage of FinanceLeasePrincipalPayments0.00.0100.0100.0100.00.00.00.0

us-gaap:GainLossOnInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-52012-3100000100000-100000010000000000000
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-52012-3100
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5-20-1-23-100
Percentage of GainLossOnInvestments-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-30
Value5-20-1-23-100000-100000-1000000100000000
Percentage of GainLossOnInvestments-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-147.3100.0100.0

us-gaap:GainLossOnSaleOfInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-52012-3100000100000-1000000100000
Percentage of GainLossOnSaleOfInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-52012-3100
Percentage of GainLossOnSaleOfInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value410001059718960230012067811990951264100
Percentage of GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.00.0100.0100.0100.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value41900106391898
Percentage of GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes102.3100.0100.0108.8100.0106.8116.4102.6102.6

us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

bxp:GatewayCenter



Period End2020-01-28
Value217
Percentage of GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes0.0

bxp:NewDominionTechnologyPark



Period End2020-02-20
Value192
Percentage of GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes0.0

us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, dei:LegalEntity

bxp:GatewayCenter, srt:Subsidiaries



Period End2020-01-28
Value222
Percentage of GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes0.0

bxp:NewDominionTechnologyPark, srt:Subsidiaries



Period End2020-02-20
Value197
Percentage of GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes0.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-41900-10-63-9-18-98
Percentage of GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value-41000-10-59-7-18-960-2-300-1206781199095126410000
Percentage of GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes97.7100.0100.091.9100.093.685.997.597.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ImpairmentOfRealEstate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-12-312015-09-30
Value00002411000000100
Percentage of ImpairmentOfRealEstate0.00.00.00.0100.0100.00.00.00.00.00.00.0100.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value00002210000
Percentage of ImpairmentOfRealEstate0.00.00.00.092.786.20.00.00.0

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0004705-40040332121223142422214488921211111871177
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0004705-400403321212231424222144888921211111871177
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0004705-400
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value000-470-5400
Percentage of IncomeLossFromEquityMethodInvestments-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value000-470-5400-40-3-3-2-1-212231424222144889212111118
Percentage of IncomeLossFromEquityMethodInvestments-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-48-1915170-5164-1321013-16-1714-5-330-508-513-161-9-23
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-48-1915170-5164-13
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsReceivable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-1749-214-2731-10-2210-1016-1918-811-252611713-813-214-101-22-60
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1749-214-2731-10-22
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInFinanceReceivables



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value128000.0-380000.0126000.0125000.0125000.013000.00.00.00.0
Percentage of IncreaseDecreaseInFinanceReceivables100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value128000.0-380000.0126000.0125000.0125000.013000.00.00.00.0
Percentage of IncreaseDecreaseInFinanceReceivables100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:IncreaseDecreaseInInterestPayableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-76-600-3-4012-1513-18122912031-1022-823-1825-2211-1330363125-6
Percentage of IncreaseDecreaseInInterestPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-76-600-3-4012
Percentage of IncreaseDecreaseInInterestPayableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-2128-47-12-176-13-112320-31-26-78-42-38-3339-16-33-232-21-17-2211-708-5-10
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-2128-47-12-176-13-1123
Percentage of IncreaseDecreaseInOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value93-6654-5968-6447-6266-6549-5721-4857-17-453742-60-3-5586-45-5-54-1868-62933
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value93-6654-5968-6447-6266
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value247000.07000.0243000.0319000.0319000.017000.0238000.0156000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value247000.07000.0243000.0319000.0319000.017000.0238000.0156000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestAndOtherIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value34733322121100311031113211311422111012
Percentage of InterestAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value347333221
Percentage of InterestAndOtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-3-4-7-3-3-3-2-2-1
Percentage of InterestAndOtherIncome-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value-3-4-7-3-3-3-2-2-1-2-1-100-3-11031113211311422111
Percentage of InterestAndOtherIncome-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestCostsCapitalized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value14131613111416171717161412109998987712141717141011118
Percentage of InterestCostsCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value141316131114161717
Percentage of InterestCostsCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestPaid



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value1141011211091071121101038912189295921061101239313410613610415611015822017974671407196
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11410112110910711211010389
Percentage of InterestPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-17-41-23-34-18-41-34
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-17-41-23-34-18-41-34
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0

us-gaap:LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value0.8970.00.00.00100000000000000090.8950.00.00.00100000000000000090.8960.00.00.00200000000000000180.8950.00.00.00.8950.00.00.00.8950.00300000000000000270.890.00100000000000000090.8840.8710.859
Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.00.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1



Period End2020-03-312019-03-31
Value0122
Percentage of NoncashOrPartNoncashAcquisitionOtherAssetsAcquired10.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-03-31
Value0122
Percentage of NoncashOrPartNoncashAcquisitionOtherAssetsAcquired10.0100.0

us-gaap:NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1516131524251213
Percentage of NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1516131524251213
Percentage of NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1516131524251213
Percentage of NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value1916181718161414171314154-2-1761010115915135742-3020
Percentage of NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value191618171816141417
Percentage of NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-19-16-18-17-18-16-14-14-17
Percentage of NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value-19-16-18-17-18-16-14-14-17-13-14-15-4217-61010115915135742-3020
Percentage of NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value57161219111713142011131511179112116219202114867850410
Percentage of NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value-57-16-12-19-11-17-13-14-20-11-13-15-11-17-9-112116219202114867850410
Percentage of NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-31
Value3562436665566455404335-64264-3810
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-31
Value-3-5-6-24-3-6-6-6-5-5-6-6-4-5-5-40-4-3-3-564-2-6-438-10
Percentage of NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:OperatingLeaseLeaseIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-31
Value71070669268067900
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-31
Value71070669268067900
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.00.00.0

us-gaap:OperatingLeaseLeaseIncomeLeasePayments



Period End2020-03-312019-09-302019-06-302019-03-31
Value586566557553
Percentage of OperatingLeaseLeaseIncomeLeasePayments100.0100.0100.0100.0

us-gaap:OperatingLeasePayments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-393000.0-425000.0-411000.0-410000.0-370000.00.00.00.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-393000.0-425000.0-411000.0-410000.0-370000.00.00.00.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.00.00.00.0

us-gaap:OperatingLeaseVariableLeaseIncome



Period End2020-03-312019-09-302019-06-302019-03-31
Value123125122125
Percentage of OperatingLeaseVariableLeaseIncome100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-92-2424100-60385-32-587-3015-3
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-82-232-31
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax89.889.789.789.889.8-89.889.8

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-988000.0262000.0-231000.0-453000.0269000.0-450000.0135000.0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax10.210.310.3-10.210.2-10.210.2

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-82-2323100-30204-23-435-2313-3
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax89.889.789.789.889.889.889.80.00.053.853.953.882.973.073.676.876.484.489.6

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value000000000-20170-8-151-720
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax10.210.310.310.210.210.210.20.00.046.246.146.217.127.026.423.223.615.610.4

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value-840-20-221111-41396-31-588-2916-200000000000000
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-840-20-2211
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value00000000000-20171-8-151-720000000000000
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1000000000000000
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeOtherNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-31
Value111111111111111000000000000000
Percentage of OtherComprehensiveIncomeOtherNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value111111111
Percentage of OtherComprehensiveIncomeOtherNetOfTax90.790.790.690.790.690.790.890.790.7

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value155000.0155000.0156000.0155000.0156000.0155000.0154000.0155000.0155000.0
Percentage of OtherComprehensiveIncomeOtherNetOfTax9.39.39.49.39.49.39.29.39.3

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-31
Value111111111111111000000000000000
Percentage of OtherComprehensiveIncomeOtherNetOfTax82.182.182.082.182.082.182.182.182.182.282.287.389.789.789.789.689.689.889.689.689.689.689.689.790.190.089.889.489.487.7

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-31
Value155000.0155000.0156000.0155000.0156000.0299000.0154000.0155000.0299000.0297000.0297000.0177000.0135000.0134000.0122000.065000.065000.064000.065000.065000.065000.065000.065000.064000.062000.063000.064000.071000.069000.080000.0
Percentage of OtherComprehensiveIncomeOtherNetOfTax9.39.39.49.39.417.99.29.317.917.817.812.710.310.310.310.410.410.210.410.410.410.410.410.39.910.010.210.610.612.3

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-92-2-4-2-410000-60385-32-587-3015-30000
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-92-2-4-2-4100
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:OtherCostAndExpenseOperating



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value615000.0569000.0538000.0417000.0460000.0195000.0914000.0474000.0
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value615000.0569000.0538000.0417000.0460000.0195000.0914000.0474000.0
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

srt:Subsidiaries, us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-615000.0-569000.0-538000.0-417000.0-460000.0-195000.0-914000.0-474000.0
Percentage of OtherCostAndExpenseOperating-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-615000.0-569000.0-538000.0-417000.0-460000.0-195000.0-914000.0-474000.0
Percentage of OtherCostAndExpenseOperating-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:PaidInKindInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value55555555555-4-7-7-8-9-10-9-10-10-10-10-10-10-7-261010111314
Percentage of PaidInKindInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value555555555
Percentage of PaidInKindInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic



Period End2020-03-312019-06-302018-12-312018-09-302018-06-30
Value10000
Percentage of ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-06-302018-12-312018-09-302018-06-30
Value10000
Percentage of ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic111.4112.5114.3110.9112.5

us-gaap:StatementEquityComponents

us-gaap:PartnersCapitalAccountContributions

bxp:BostonPropertiesLimitedParntership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value615-3040001
Percentage of PartnersCapitalAccountContributions100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value615-3040001
Percentage of PartnersCapitalAccountContributions100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value39-1013400034
Percentage of PartnersCapitalAccountContributions592.1-8.3-0.0122.7713.773.0-0.8306.92359.4

us-gaap:StatementEquityComponents

us-gaap:PartnersCapitalAccountDeferredCompensation

bxp:BostonPropertiesLimitedParntership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value00-70-1000-1
Percentage of PartnersCapitalAccountDeferredCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value00-70-1000-1
Percentage of PartnersCapitalAccountDeferredCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-24768-20777-20
Percentage of PartnersCapitalAccountDeferredCompensation-2416.12443.4-94.01351.71512.21027.81001.21269.91693.1

us-gaap:StatementEquityComponents

us-gaap:PartnersCapitalAccountDistributions

bxp:BostonPropertiesLimitedParntership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-152-151-146-146-146-146-146-123-123
Percentage of PartnersCapitalAccountDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-154-154-149-149-149-149-149-126-126
Percentage of PartnersCapitalAccountDistributions101.7101.7101.8101.8101.8101.8101.8102.1102.1

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-17-17-17-17-17-17-17-14-14
Percentage of PartnersCapitalAccountDistributions11.511.611.711.711.711.611.611.611.6

us-gaap:StatementEquityComponents

us-gaap:PartnersCapitalAccountExchangesAndConversions

bxp:BostonPropertiesLimitedParntership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1530000000
Percentage of PartnersCapitalAccountExchangesAndConversions100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1530000000
Percentage of PartnersCapitalAccountExchangesAndConversions100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-15-30000000
Percentage of PartnersCapitalAccountExchangesAndConversions-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StatementEquityComponents

us-gaap:PartnersCapitalAccountRedemptions

bxp:BostonPropertiesLimitedParntership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value868-131-9100-40619748-30115
Percentage of PartnersCapitalAccountRedemptions100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value868-131-9100-40619748-30115
Percentage of PartnersCapitalAccountRedemptions100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-8681319-100406-197-4830-115
Percentage of PartnersCapitalAccountRedemptions-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:PaymentsForCapitalImprovements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value39514947324844435360615743683322252836281925201917271410884
Percentage of PaymentsForCapitalImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value395149473248444353
Percentage of PaymentsForCapitalImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForTenantImprovements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-09-30
Value646075615480453647524556506250615558342426252622312624353422
Percentage of PaymentsForTenantImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value646075615480453647
Percentage of PaymentsForTenantImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfFinancingCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-31
Value0066080006043008080100000000000
Percentage of PaymentsOfFinancingCosts100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.00.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value006608000
Percentage of PaymentsOfFinancingCosts100.0100.0100.0100.0100.0100.00.0100.0100.0

us-gaap:PaymentsToAcquireAndDevelopRealEstate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-31
Value0010504300000000-4412200-606040500002896662141
Percentage of PaymentsToAcquireAndDevelopRealEstate0.0100.0100.00.0100.00.00.00.00.00.00.00.00.0100.0100.00.00.0100.0100.0100.00.00.00.00.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value001050430000
Percentage of PaymentsToAcquireAndDevelopRealEstate0.0100.0100.00.0100.00.00.00.00.0

us-gaap:PaymentsToAcquireEquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value892115232631248164819482317285201510175122404700000136
Percentage of PaymentsToAcquireEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8921152326312481648
Percentage of PaymentsToAcquireEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:GatewayCommonsComplex



Period End2020-01-28
Value350
Percentage of PaymentsToAcquireEquityMethodInvestments0.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

bxp:GatewayCommonsComplex, bxp:JointVenturePartner



Period End2020-01-28
Value280
Percentage of PaymentsToAcquireEquityMethodInvestments0.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

bxp:GatewayCommonsComplex, us-gaap:SubsequentEvent



Period End2020-01-28
Value350
Percentage of PaymentsToAcquireEquityMethodInvestments0.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType, dei:LegalEntity

bxp:GatewayCommonsComplex, us-gaap:SubsequentEvent, bxp:JointVenturePartner



Period End2020-01-28
Value280
Percentage of PaymentsToAcquireEquityMethodInvestments0.0

us-gaap:PaymentsToAcquireMarketableSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-09-302011-03-31
Value-3000000000000000000000001000000
Percentage of PaymentsToAcquireMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-300000000
Percentage of PaymentsToAcquireMarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireOtherProductiveAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value14315518711785164149230150156154143154140116120122
Percentage of PaymentsToAcquireOtherProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value14315518711785164149230150
Percentage of PaymentsToAcquireOtherProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToMinorityShareholders



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-09-302011-03-31
Value1516131524251213301214131316121212251101817111195320000
Percentage of PaymentsToMinorityShareholders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value151613152425121330
Percentage of PaymentsToMinorityShareholders100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:PreferredStockDividendRatePercentage

bxp:SeriesBCumulativeRedeemablePreferredStockUnit



Period End2020-03-312019-12-312019-09-30
Value0.05250.00.0
Percentage of PreferredStockDividendRatePercentage100.00.00.0

us-gaap:PreferredStockDividendsIncomeStatementImpact



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-302012-03-31
Value2222222222222222222222222222000
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2222222222
Percentage of PreferredStockDividendsIncomeStatementImpact-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOrSaleOfEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value31100100000000000000000010000030
Percentage of ProceedsFromIssuanceOrSaleOfEquity100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3110010000
Percentage of ProceedsFromIssuanceOrSaleOfEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromLinesOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value2650033050165235852601104025517525000
Percentage of ProceedsFromLinesOfCredit100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value265003305016523585260
Percentage of ProceedsFromLinesOfCredit100.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromMinorityShareholders



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value3814-7499-1215131412485122000011050
Percentage of ProceedsFromMinorityShareholders100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value38147499
Percentage of ProceedsFromMinorityShareholders100.0100.0100.0-100.0100.0100.0100.0

us-gaap:StatementEquityComponents

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3814-7499-1215
Percentage of ProceedsFromMinorityShareholders100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3814-7499-1215
Percentage of ProceedsFromMinorityShareholders100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfRealEstateHeldforinvestment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value25972340202793425116012160017010421319401943161030089
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.00.0100.0100.0100.00.0100.0100.0100.00.00.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value25972340202793425116
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty

bxp:NewDominionTechnologyPark



Period End2020-02-20
Value254
Percentage of ProceedsFromSaleOfRealEstateHeldforinvestment0.0

us-gaap:RepaymentsOfLinesOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1500330503356520019065403607025000
Percentage of RepaymentsOfLinesOfCredit100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value15003305033565200190
Percentage of RepaymentsOfLinesOfCredit100.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfSecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value430545353535130353110021663475756956-16232815087
Percentage of RepaymentsOfSecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4305453535
Percentage of RepaymentsOfSecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:StockIssuedDuringPeriodSharesConversionOfUnits

us-gaap:GeneralPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3000.01000.00.00.01000.00.00.00.0
Percentage of StockIssuedDuringPeriodSharesConversionOfUnits100.0100.00.00.0100.00.00.00.0

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value458000.0101000.07000.021000.013000.022000.026000.010000.0
Percentage of StockIssuedDuringPeriodSharesConversionOfUnits15266.710100.00.00.01300.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value0000000000000000000000000000010
Percentage of StockIssuedDuringPeriodSharesConversionOfUnits15400.010300.00.00.01400.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value2000.00.02000.00.04000.00.03000.00.03000.00.03000.00.03000.00.03000.00.03000.00.04000.00.02000.00.03000.00.04000.00.03000.04000.04000.04000.05000.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:GeneralPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1000.00.00.01000.02000.00.00.00.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.00.00.0100.0100.00.00.00.0

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value63000.0116000.02000.026000.041000.0-4000.03000.039000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation6300.00.00.02600.02050.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value61000.0115000.00.027000.039000.0-5000.00.039000.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation6100.00.00.02700.01950.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value15300000000015003200328001019046290
Percentage of StockIssuedDuringPeriodValueConversionOfUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-31
Value5000.01000.00.01000.00.01000.00.00.01000.00.00.05000.00.00.01000.01000.00.00.01000.01000.03000.00.00.01000.00.06000.00.02000.02000.011000.0
Percentage of StockIssuedDuringPeriodValueConversionOfUnits0.00.00.00.10.00.10.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.00.00.00.00.00.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value-15-3000000000-1500-3-200-3-2-800-10-190-4-6-290
Percentage of StockIssuedDuringPeriodValueConversionOfUnits-100.0-100.0-100.0-100.1-100.0-100.1-100.0-100.0-100.1-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.1-100.0-100.0-100.0-100.0-100.0-100.0-100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value325000.00.0315000.00.0373000.00.0368000.00.0429000.00.0422000.00.0373000.00.0398000.00.0332000.00.0467000.00.0313000.00.0404000.00.0357000.00.0335000.0400000.0381000.0312000.0326000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-03-312010-03-31
Value325000.00.0315000.00.0373000.00.0368000.00.0429000.00.0422000.00.0373000.00.0398000.00.0332000.00.0467000.00.0313000.00.0404000.00.0357000.00.0335000.0400000.0381000.0312000.0326000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value231801016888
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value711-713000
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation32.063.11622.213.818.64.78.99.2

us-gaap:CommonStock



Period End2020-03-31
Value0.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation0.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1566913777
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation68.036.9-1522.286.281.495.391.190.8

us-gaap:StraightLineRent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-09-302012-03-312011-09-30
Value2737-1821152-419262216109139-71217151623152011101514191916
Percentage of StraightLineRent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2737-1821152-41926
Percentage of StraightLineRent100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:StraightLineRentAdjustments

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312013-03-312012-09-302012-06-302012-06-302012-03-312011-09-302011-06-30
Value-9-13-5-7-5-6-4-3-1-5-5-4-7-7-5-3-2-200-1-100000-3-4-4-22-2-4-64
Percentage of StraightLineRentAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:ColoradoCenter



Period End2020-03-312019-03-312017-03-312016-12-312016-09-30
Value-500000.0-500000.0-700000.0-700000.0-700000.0
Percentage of StraightLineRentAdjustments5.28.610.09.913.5

us-gaap:TransferOfOtherRealEstate



Period End2020-03-312019-12-312019-03-312018-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-03-312012-03-31
Value-1110000000070
Percentage of TransferOfOtherRealEstate100.00.00.00.00.00.00.00.00.0100.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value-111000
Percentage of TransferOfOtherRealEstate100.00.00.00.0

us-gaap:TransferToInvestments



Period End2020-03-312019-12-312019-03-312018-12-31
Value347000
Percentage of TransferToInvestments100.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value347000
Percentage of TransferToInvestments100.00.00.00.0

us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:SubsequentEventType

bxp:Aggregatepurchaseprice

bxp:FourHundredtwentyfiveFourthStreet, us-gaap:SubsequentEvent



Period End2020-01-28
Value134
Percentage of Aggregatepurchaseprice100.0

dei:LegalEntity

bxp:CompanyShareOfEquity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value956591569574642622593349335286291498471450449255238237219212201209208205155154167780787793799796799898925917924927
Percentage of CompanyShareOfEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:SubsequentEventType

bxp:ContractualSalesPrice

bxp:NewDominionTechnologyPark, us-gaap:SubsequentEvent



Period End2020-02-20
Value256
Percentage of ContractualSalesPrice100.0

us-gaap:ConsolidatedEntities

bxp:DistributionsMadeToOpAndLtipUnitsPerUnit

srt:Subsidiaries



Period End2020-01-302019-10-312019-07-312019-04-302019-01-302018-10-312018-07-312018-04-302018-01-30
Value0.980.950.950.950.950.950.80.80.8
Percentage of DistributionsMadeToOpAndLtipUnitsPerUnit100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

bxp:FinanceLeasefixedpurchaseprice

bxp:PlatformSixteen, us-gaap:SubsequentEvent



Period End2020-01-28
Value134
Percentage of FinanceLeasefixedpurchaseprice100.0

us-gaap:ConsolidatedEntities

bxp:GeneralAndLimitedPartnersCapitalAccount

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value462633803505356236034054
Percentage of GeneralAndLimitedPartnersCapitalAccount100.0100.0100.0100.0100.0100.0

bxp:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesnet



Period End2020-03-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1355933931593753210182
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesnet100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType

bxp:LtipUnitsIssued

bxp:LTIPUnits, us-gaap:SubsequentEvent



Period End2020-02-04
Value196927.0
Percentage of LtipUnitsIssued100.0

us-gaap:StatementEquityComponents

bxp:MYLTIPUnitsForfeited

bxp:MYLTIPtwothousandseventeen



Period End2020-02-06
Value270942.0
Percentage of MYLTIPUnitsForfeited100.0

us-gaap:SubsequentEventType, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:SubsequentEvent, bxp:MYLTIPtwothousandseventeen



Period End2020-02-06
Value270942.0
Percentage of MYLTIPUnitsForfeited100.0

us-gaap:ConsolidatedEntities

bxp:NoncontrollingInterestRedeemablePartnershipUnitsCommonUnitsLongTermIncentiveUnitsAtRedemptionValueSharesOutstanding

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value111110
Percentage of NoncontrollingInterestRedeemablePartnershipUnitsCommonUnitsLongTermIncentiveUnitsAtRedemptionValueSharesOutstanding100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

bxp:NoncontrollingInterestRedeemablePartnershipUnitsCommonUnitsSharesOutstanding

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value161616161616
Percentage of NoncontrollingInterestRedeemablePartnershipUnitsCommonUnitsSharesOutstanding100.0100.0100.0100.0100.0100.0

bxp:RealEstateInvestmentPropertyAtCostIncludingRightofUseAssets



Period End2020-03-312019-12-312018-12-31
Value227272288921649
Percentage of RealEstateInvestmentPropertyAtCostIncludingRightofUseAssets100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312018-12-31
Value223452249321251
Percentage of RealEstateInvestmentPropertyAtCostIncludingRightofUseAssets98.398.398.2

us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bxp:TwothousandtwentyMYLTIP

srt:Subsidiaries, bxp:TwothousandtwentyMYLTIPSMember



Period End2020-03-31
Value203278.0
Percentage of TwothousandtwentyMYLTIP100.0

bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

bxp:ValueOfMyltipAwards

bxp:TwothousandtwentyMYLTIPSMember



Period End2020-02-04
Value13
Percentage of ValueOfMyltipAwards100.0

us-gaap:StatementEquityComponents

bxp:MYLTIPtwothousandseventeen



Period End2020-02-06
Value17
Percentage of ValueOfMyltipAwards0.0

us-gaap:SubsequentEventType, bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:SubsequentEvent, bxp:MYLTIPtwothousandseventeen



Period End2020-02-06
Value17
Percentage of ValueOfMyltipAwards0.0

us-gaap:SubsequentEvent, bxp:TwothousandtwentyMYLTIPSMember



Period End2020-02-04
Value13
Percentage of ValueOfMyltipAwards100.0

dei:EntityCommonStockSharesOutstanding



Period End2020-02-212019-11-012019-08-022019-05-022019-02-222018-11-022018-08-022018-05-022018-02-222017-11-022017-08-032017-05-032017-02-222016-11-022016-08-022016-05-022016-02-22
Value155154154154154154154154154154154153153153153153153
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value293377421418328276315327355331325303313298312287252274245231224243253216218202212210199193163165155172173171186220
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value293377421418328276
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value284544457975
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent9.712.110.411.024.327.4

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value284544457975788012610610611613311012710982
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent9.712.110.411.024.327.425.024.535.632.232.838.342.637.040.837.932.6

us-gaap:AccountsReceivableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value8911210287928698637392798873927684739766554746435137596675694543687947445412993
Percentage of AccountsReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value89112102879286
Percentage of AccountsReceivableNet100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value192825101515
Percentage of AccountsReceivableNet22.325.624.711.817.117.9

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1928251015154217202719171623191924
Percentage of AccountsReceivableNet22.325.624.711.817.117.942.826.927.329.424.920.222.825.425.223.233.1

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value63216294627462786414640764006391638463776370636363396333632663166306630563006293628662705684567956685662524652325222519451845050493649164846477144174373
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

us-gaap:AreaOfLand

bxp:PlatformSixteen, us-gaap:SubsequentEvent



Period End2020-01-28
Value5.6
Percentage of AreaOfLand100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:AssetsFairValueDisclosure

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value9495999999
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value9996999899
Percentage of AssetsFairValueDisclosure105.0101.0100.098.8100.0

us-gaap:ConstructionInProgressGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value804789953812647578105711631262126913861348121110379548658577637258807977367151309156415231483114510369377328708188999826811073563
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value804789953812647578
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0

us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentCarryingAmount

bxp:Threepointthreefourthreepercentunsecuredseniornotes, us-gaap:SubsequentEvent



Period End2020-05-05
Value1250
Percentage of DebtInstrumentCarryingAmount100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

bxp:MetropolitanSquareAssociatesLlc, us-gaap:SubsequentEvent



Period End2020-04-22
Value156
Percentage of DebtInstrumentCarryingAmount0.0

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us-gaap:DebtInstrumentMeasurementInput

us-gaap:FinanceReceivables, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0449
Percentage of DebtInstrumentMeasurementInput100.0

us-gaap:NotesReceivable, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0362
Percentage of DebtInstrumentMeasurementInput80.6

us-gaap:LongtermDebtType, us-gaap:MeasurementInputType

us-gaap:LineOfCredit, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0184
Percentage of DebtInstrumentMeasurementInput41.0

us-gaap:Range, us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:MeasurementInputType

srt:WeightedAverage, us-gaap:FinanceReceivables, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0449
Percentage of DebtInstrumentMeasurementInput100.0

srt:WeightedAverage, us-gaap:NotesReceivable, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0362
Percentage of DebtInstrumentMeasurementInput80.6

us-gaap:Range, us-gaap:LongtermDebtType, us-gaap:MeasurementInputType

srt:Maximum, us-gaap:SecuredDebt, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0325
Percentage of DebtInstrumentMeasurementInput72.4

srt:Minimum, us-gaap:SecuredDebt, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0282
Percentage of DebtInstrumentMeasurementInput62.8

srt:WeightedAverage, us-gaap:LineOfCredit, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0184
Percentage of DebtInstrumentMeasurementInput41.0

srt:WeightedAverage, us-gaap:SecuredDebt, us-gaap:MeasurementInputDiscountRate



Period End2020-03-31
Value0.0291
Percentage of DebtInstrumentMeasurementInput64.8

us-gaap:DeferredCosts



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value667689689676666678669678681679657658666686680697693732749771806831837853861884939572588534504500445441449449436294
Percentage of DeferredCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value667689689676666678
Percentage of DeferredCosts100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value205214218226254263
Percentage of DeferredCosts30.831.231.733.538.138.8

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value205214218226254263261264272281268267277290304320323
Percentage of DeferredCosts30.831.231.733.538.138.839.139.140.041.540.940.641.642.344.745.946.6

us-gaap:DeferredRentReceivablesNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value105910381003973954934926912888861835820812799785776767754737730713691689673661651625612598579559541522508491463442363
Percentage of DeferredRentReceivablesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value105910381003973954934
Percentage of DeferredRentReceivablesNet100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value308298292283280272
Percentage of DeferredRentReceivablesNet29.128.729.229.229.429.1

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value308298292283280272269268258242232227227224221220217
Percentage of DeferredRentReceivablesNet29.128.729.229.229.429.129.129.429.128.227.827.728.028.128.128.428.3

us-gaap:DividendsPayableAmountPerShare



Period End2020-03-182019-12-172019-09-172019-06-102019-03-182018-12-172018-09-182018-06-142018-03-152017-12-182017-09-152017-06-162017-03-162016-12-192016-09-012016-06-162016-03-092016-01-282015-09-162015-06-172015-03-182014-12-082014-09-112014-06-192014-03-182013-11-272013-06-18
Value0.980.980.950.950.950.950.950.80.80.80.750.750.750.750.650.650.651.90.650.650.650.650.650.650.650.650.65
Percentage of DividendsPayableAmountPerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-182019-12-172019-09-172019-06-102019-03-18
Value0.980.980.950.950.95
Percentage of DividendsPayableAmountPerShare100.0100.0100.0100.0100.0

us-gaap:DividendsPayableCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value171170165165165165165139139139130130130130113113113327112112112882112112114497112112110110939392918383838180
Percentage of DividendsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value171170165165165165165139139139
Percentage of DividendsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:StockOptionAndIncentivePlanAndStockRepurchasePlan

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

bxp:LtipsincludingvestedMYLTIPSAndRestrictedStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value42283338273136222630222630
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:UnvestedMYLTIPUnits



Period End2020-03-31
Value19
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized46.9

dei:LegalEntity

us-gaap:EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value398341340338308
Percentage of EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:ColoradoCenter



Period End2020-03-312019-12-312018-12-31
Value310311316
Percentage of EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity77.791.2102.6

bxp:GatewayCommonsComplex



Period End2020-03-31
Value55
Percentage of EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity14.0

dei:LegalEntity

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationAssets

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value50474407428040674194408939992335222021362090191418511816175513611266132812891282126012981197118610791087111151285168516251955195521056715735575157785909
Percentage of EquityMethodInvestmentSummarizedFinancialInformationAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value209614381399141915161489143468465360059296991888387448539845042341339143442041231130833913231335134413541363136716241666164916571620
Percentage of EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2272242211721730
Percentage of FinanceLeaseLiability100.0100.0100.0100.0100.00.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-31
Value391510
Percentage of FinanceLeaseLiability172.2228.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2272242211721730
Percentage of FinanceLeaseLiability100.0100.0100.0100.0100.00.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value2020202020
Percentage of FinanceLeaseLiability8.99.09.111.611.6

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value2020202020
Percentage of FinanceLeaseLiability8.99.09.111.611.6

us-gaap:FinanceLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2372372371871870
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0100.00.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-31
Value248383
Percentage of FinanceLeaseRightOfUseAsset104.8161.7

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2372372371871870
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0100.00.0

us-gaap:FurnitureAndFixturesGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value44444444434444444137373736323129272523262423
Percentage of FurnitureAndFixturesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value444444444344
Percentage of FurnitureAndFixturesGross100.0100.0100.0100.0100.0100.0

us-gaap:GeneralPartnersCapitalAccountUnitsOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value11111111111111111
Percentage of GeneralPartnersCapitalAccountUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value111111
Percentage of GeneralPartnersCapitalAccountUnitsOutstanding100.0100.0100.0100.0100.0100.0

us-gaap:InterestPayableCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value8290838989899296968399852662432342222211902001781861631811561781671419972986197698962886276
Percentage of InterestPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value829083898989
Percentage of InterestPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentBuildingAndBuildingImprovements



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-312011-12-31
Value13517136461339613271132861335612949127201243512284121551196011904118901179211709116661106595178658
Percentage of InvestmentBuildingAndBuildingImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value132321335113101129761299113059
Percentage of InvestmentBuildingAndBuildingImprovements97.997.897.897.897.897.8

us-gaap:LandAvailableForDevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value264254246272258200205210204204212250249246243241256252264277271268276273300297290503275273270268266266284759757718
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value264254246272258200
Percentage of LandAvailableForDevelopment100.0100.0100.0100.0100.0100.0

us-gaap:LeaseholdImprovementsGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value264126562559248624442396232222782266221921862136211120602001192017521617143512621090922
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value264126562559248624442396
Percentage of LeaseholdImprovementsGross100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value153153152152152152152152152152152152152152152151151
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value153153152152152152
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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312011-12-31
Value250000001700115450010500000000000000000
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us-gaap:ConsolidatedEntities

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value25000000
Percentage of LineOfCredit100.00.00.00.00.00.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-31
Value250000001700115451050
Percentage of LineOfCredit100.00.00.00.00.00.0100.00.0100.0100.0100.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-31
Value249000001700115451050
Percentage of LineOfCredit99.90.00.00.00.00.0100.20.0100.0100.0100.10.0

us-gaap:MarketableSecurities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2836343332283130292927262523232121201920201918181816141312111111999989
Percentage of MarketableSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value283634333228
Percentage of MarketableSecurities100.0100.0100.0100.0100.0100.0

us-gaap:MinorityInterestInLimitedPartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value17001728172016961710171117111699168516831668165315291530152515521563157415901590159916027167217257264898-11-1-1-100005
Percentage of MinorityInterestInLimitedPartnerships100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:MinorityInterestInOperatingPartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value636600603608623619618621619604605604617614608612616603620614617603606601575576570540539568573557548559579594592617
Percentage of MinorityInterestInOperatingPartnerships100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesReceivableGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1515191919190
Percentage of NotesReceivableGross100.0100.0100.0100.0100.0100.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value151519191919
Percentage of NotesReceivableGross100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value151519191919
Percentage of NotesReceivableGross100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value151418181719
Percentage of NotesReceivableGross98.794.193.392.390.5100.0

us-gaap:NotesReceivableRelatedParties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value78808080808080000282282282282281280276276270270270
Percentage of NotesReceivableRelatedParties100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value788080808080
Percentage of NotesReceivableRelatedParties100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value788080808080800
Percentage of NotesReceivableRelatedParties100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value838181808080800
Percentage of NotesReceivableRelatedParties106.2102.4101.7100.4100.1100.0100.00.0

us-gaap:Range, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

srt:Maximum, bxp:SevenSevenFiveZeroWisconsinAvenue



Period End2020-03-31
Value15
Percentage of NotesReceivableRelatedParties19.0

srt:Minimum, bxp:SevenSevenFiveZeroWisconsinAvenue



Period End2020-03-31
Value0.0
Percentage of NotesReceivableRelatedParties0.0

us-gaap:RealEstateProperties

us-gaap:NumberOfRealEstateProperties

bxp:OfficePropertiesUnderConstruction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value8.09.011.010.09.09.012.09.09.08.07.06.06.06.06.06.09.09.011.012.09.09.09.012.08.08.07.06.08.07.05.07.06.07.06.0
Percentage of NumberOfRealEstateProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:PropertiesUnderConstruction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-31
Value10.011.013.012.011.011.014.012.013.012.010.09.08.08.08.08.011.011.014.013.010.010.010.013.08.09.08.07.09.0
Percentage of NumberOfRealEstateProperties125.0122.2118.2120.0122.2122.2116.7133.3144.4150.0142.9150.0133.3133.3133.3133.3122.2122.2127.3108.3111.1111.1111.1108.3100.0112.5114.3116.7112.5

bxp:ResidentialPropertiesUnderConstruction



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value2.02.02.02.02.02.02.03.04.04.03.03.02.02.02.02.02.02.02.01.01.01.01.01.01.01.01.0
Percentage of NumberOfRealEstateProperties25.022.218.220.022.222.216.733.344.450.042.950.033.333.333.333.322.222.218.212.514.316.712.514.320.014.316.7

bxp:RetailProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value12.012.012.012.012.012.013.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.05.04.04.04.04.04.03.03.03.03.03.03.0
Percentage of NumberOfRealEstateProperties150.0133.3109.1120.0133.3133.3108.355.655.662.571.483.383.383.383.383.355.655.645.541.755.655.655.641.750.050.057.166.750.042.960.042.950.042.950.0

bxp:TotalOfficeProperties



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value177.0177.0177.0174.0177.0178.0180.0166.0167.0167.0166.0164.0164.0164.0164.0158.0157.0158.0161.0162.0160.0160.0163.0171.0167.0167.0171.0149.0149.0145.0143.0146.0146.0147.0146.0
Percentage of NumberOfRealEstateProperties2212.51966.71609.11740.01966.71977.81500.01844.41855.62087.52371.42733.32733.32733.32733.32633.31744.41755.61463.61350.01777.81777.81811.11425.02087.52087.52442.92483.31862.52071.42860.02085.72433.32100.02433.3

us-gaap:CommercialRealEstate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value196.0196.0196.0193.0196.0197.0200.0178.0179.0179.0177.0175.0174.0174.0174.0168.0167.0168.0171.0170.0168.0169.0172.0180.0175.0175.0179.0157.0157.0152.0150.0153.0153.0153.0152.0
Percentage of NumberOfRealEstateProperties2450.02177.81781.81930.02177.82188.91666.71977.81988.92237.52528.62916.72900.02900.02900.02800.01855.61866.71554.51416.71866.71877.81911.11500.02187.52187.52557.12616.71962.52171.43000.02185.72550.02185.72533.3

us-gaap:ResidentialRealEstate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value6.06.06.06.06.06.06.06.06.06.05.05.04.04.04.04.04.04.04.02.02.03.03.03.03.03.03.03.03.03.03.03.03.02.02.0
Percentage of NumberOfRealEstateProperties75.066.754.560.066.766.750.066.766.775.071.483.366.766.766.766.744.444.436.416.722.233.333.325.037.537.542.950.037.542.960.042.950.028.633.3

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:AnnapolisJunctionNfmLlc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-03-312011-12-312011-09-302011-06-30
Value3.03.03.03.03.03.04.04.04.04.04.04.04.04.04.04.04.04.03.02.02.02.02.02.02.02.02.02.01.01.01.01.01.0
Percentage of NumberOfRealEstateProperties37.533.327.330.033.333.333.344.444.450.057.166.766.766.766.766.744.444.427.316.722.222.222.216.725.025.028.633.312.514.316.714.316.7

us-gaap:OperatingLeaseLiability



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312019-01-012018-12-31
Value2002001991991991990
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.00.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-31
Value1717
Percentage of OperatingLeaseLiability8.78.6

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value2002001991991990
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.00.0

dei:LegalEntity

us-gaap:OtherAssets

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value578502498515534543523397376367374315297297294237225256240243224264182175158163162645673657675658668680734745749760
Percentage of OtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherBorrowings



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value49949849849849849849849800000
Percentage of OtherBorrowings100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value499498498498498498
Percentage of OtherBorrowings100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value4994984984984984984984980
Percentage of OtherBorrowings100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value5005005005005005005025000
Percentage of OtherBorrowings100.3100.3100.4100.4100.4100.5100.8100.40.0

us-gaap:OtherLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value366387356355369503468462470443419452446450461508498483448448483502517539556578556316324309308324293244231210213127
Percentage of OtherLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value638749773656604582589126959986816867544738443235383423261928257597927918228298549079299499691071
Percentage of OtherLiabilities174.2193.2216.9184.5163.5115.5125.827.320.322.320.717.915.414.911.89.47.89.27.37.98.06.84.54.93.55.04.6239.9244.3256.0266.8255.5291.0370.9401.4451.5455.0840.5

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value366387356355369503
Percentage of OtherLiabilities100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value142140129128182200
Percentage of OtherLiabilities38.836.136.336.149.439.8

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:BpCrfNineZeroOneNewYorkAvenueLlc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value12121212131312121313109101011
Percentage of OtherLiabilities3.33.13.53.63.62.72.72.82.83.12.62.12.32.32.5

bxp:FiveZeroZeroNorthCapitolLlc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value555545444333333
Percentage of OtherLiabilities1.61.41.61.51.31.01.01.00.90.90.90.80.80.80.7

bxp:SquareFourZeroSevenLimitedPartnership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value445556677887789
Percentage of OtherLiabilities1.21.31.41.61.61.31.51.61.71.92.01.71.81.82.1

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value222225252225
Percentage of OtherLiabilities6.15.85.05.84.95.2

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value142140129128182200200183187164146159181175195195205
Percentage of OtherLiabilities38.836.136.336.149.439.842.839.639.837.135.035.240.738.942.338.441.1

us-gaap:ConsolidatedEntities

us-gaap:PartnersCapital

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value476435253647370537484200
Percentage of PartnersCapital100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

us-gaap:PartnersCapitalAttributableToNoncontrollingInterest

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value17361728172016961711
Percentage of PartnersCapitalAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest

bxp:BostonPropertiesLimitedParntership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value46263380350535623603405438473820384236643670
Percentage of PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bxp:Capital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value65005254536754015458591257065665567354915342
Percentage of PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest140.5155.4153.1151.6151.5145.8148.3148.3147.6149.9145.6

bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value17361728172016961710171117111699168516831530
Percentage of PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest37.551.149.147.647.542.244.544.543.945.941.7

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-55-48-51-51-48-47-45-47-49-50-52
Percentage of PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest-1.2-1.4-1.5-1.4-1.4-1.2-1.2-1.2-1.3-1.4-1.4

us-gaap:StatementClassOfStock

us-gaap:PreferredStockParOrStatedValuePerShare

bxp:SeriesBCumulativeRedeemablePreferredStockUnit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value0.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.010.0
Percentage of PreferredStockParOrStatedValuePerShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PreferredStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312011-12-31
Value20020020020020020020020020020020020020020020020020020020020020020020020020020020020000
Percentage of PreferredStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:PrepaidExpenseAndOtherAssets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1364111068131801338514777144931501291761441361851431171651642191331781841797190132417375102921006517
Percentage of PrepaidExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value136411106813180
Percentage of PrepaidExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value522058255626
Percentage of PrepaidExpenseAndOtherAssets38.550.252.637.342.632.8

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value5220582556266234613368416842768477
Percentage of PrepaidExpenseAndOtherAssets38.550.252.637.342.632.846.740.541.743.247.244.545.732.943.158.557.0

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value52095266516450504962489748384745467445894484437943024222411340563969392538333753364635473469336832633161299629192934284327812722264225582468241123232033
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value510751625061494948644800
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation98.098.098.098.098.098.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1082105810271011999965
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation20.820.119.920.020.119.7

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1082105810271011999965942910883854825799774758-713-712-690
Percentage of RealEstateInvestmentPropertyAccumulatedDepreciation20.820.119.920.020.119.719.519.218.918.618.418.318.018.0-17.3-17.6-17.4

us-gaap:RealEstateInvestmentPropertyAtCost



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2234222502222882194321741216492168721526213162109620859206142039220147199021869018424194811841218207181531923618362176801725818978170591350314893131651314312937133891203111786115671276411099
Percentage of RealEstateInvestmentPropertyAtCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value219592210721893215472134521251
Percentage of RealEstateInvestmentPropertyAtCost98.398.298.298.298.298.2

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value656464976462642675117481
Percentage of RealEstateInvestmentPropertyAtCost29.428.929.029.334.634.6

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value65646497646264267511748174267358727871727084700069086760661860256024
Percentage of RealEstateInvestmentPropertyAtCost29.428.929.029.334.634.634.234.234.134.034.034.033.933.633.332.232.7

us-gaap:RealEstateInvestmentPropertyNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value175181762217511172291711616752168491678016641165071637416234160891592515789157401556915555155691561215575156881588615894158601581715835122701195911534113651135210746106391058410597104419065
Percentage of RealEstateInvestmentPropertyNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value44693904378235513660354534751938184417681716159915531519146011241041107210481038103610341014101092192494944824494450445194536454249915000500650285149
Percentage of RealEstateInvestmentPropertyNet25.522.221.620.621.421.220.611.611.110.710.59.99.79.59.37.16.76.96.76.76.76.66.46.45.85.86.036.537.639.139.840.042.346.947.247.248.256.8

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value172381733017217169341681916451
Percentage of RealEstateInvestmentPropertyNet98.498.398.398.398.398.2

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount



Period End2020-03-312019-12-312019-09-302018-12-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value587000000251
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount100.0100.0100.00.00.00.00.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302018-12-31
Value5870
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount100.0100.0100.00.0

us-gaap:ConsolidatedEntities

us-gaap:RedeemableNoncontrollingInterestEquityPreferredCarryingAmount

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value16392468233523242000
Percentage of RedeemableNoncontrollingInterestEquityPreferredCarryingAmount100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

bxp:NoncontrollinginterestRedeemablepartnershipunits



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value16392468233523242414200021902235219622922262
Percentage of RedeemableNoncontrollingInterestEquityPreferredCarryingAmount100.0100.0100.0100.00.0100.00.00.00.00.00.0

bxp:OpUnits



Period End2020-03-312019-12-312019-09-302019-06-30
Value1600250023002300
Percentage of RedeemableNoncontrollingInterestEquityPreferredCarryingAmount97.6101.398.599.0

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value197465375729510125416070834751636365717390252588487153595457545555323130403630230530821
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value19746537572951012541607063
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value29192922295229562959296429672972297429792982298620462063207731893416343841324269428943094328441144304449448430533102284828772946312331793181318830472643
Percentage of SecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

bxp:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2312221821071991207420171975152414711437141186386486582682782983383283283183075374774874974530443039302630183001298831393138315131513217
Percentage of SecuredDebt79.275.971.467.370.168.166.651.349.548.247.328.942.242.039.826.024.324.320.219.519.419.317.417.016.916.816.699.798.0106.3104.9101.995.798.898.798.9103.4121.7

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value291929222952295629592964
Percentage of SecuredDebt100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:VariableInterestEntitiesByClassificationOfEntity

srt:Subsidiaries, us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value291629182921292429262929
Percentage of SecuredDebt99.999.999.098.998.998.8

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302012-12-31
Value2919292229522956295929642967297229742979298229862046206320773189341634384132426942894309432844114430444944843102
Percentage of SecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302012-12-31
Value3054298430523013294829032898293829573042304930562074209221113243347735034240440144284449446045474577454545983256
Percentage of SecuredDebt104.6102.1103.4101.999.698.097.798.999.4102.1102.3102.4101.4101.4101.6101.7101.8101.9102.6103.1103.3103.2103.0103.1103.3102.1102.5105.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

bxp:AnnapolisJunctionbuildingsevenandeight



Period End2020-03-182019-12-06
Value3434
Percentage of SecuredDebt0.00.0

us-gaap:VariableInterestEntitiesByClassificationOfEntity

us-gaap:VariableInterestEntityPrimaryBeneficiary



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value29162918292129242926292929312934293629392941294320042018203220462060
Percentage of SecuredDebt99.999.999.098.998.998.898.898.798.798.798.698.697.997.897.864.260.3

us-gaap:SeniorNotes



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value83938390838783907547754472537251724972477252725072487245724362576255528952885288528852875837583658365835583446394639463948633865386530163016301630162172
Percentage of SeniorNotes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value839383908387839075477544
Percentage of SeniorNotes100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302012-12-31
Value8393839083878390754775447253725172497247725272507248724572436257625552895288528852885287583758365836583558344639
Percentage of SeniorNotes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302012-12-31
Value8449882688488745758474697174718872627461753375167460742877616819670555475603560257495645617362296145605060935162
Percentage of SeniorNotes100.7105.2105.5104.2100.599.098.999.1100.2103.0103.9103.7102.9102.5107.2109.0107.2104.9106.0105.9108.7106.8105.8106.7105.3103.7104.4111.3

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value84208014799580208170821382058213818481028099807379227931785978987929788680627988799879027047701370027043674166845805563456855705551954135384533652894964507850685065506942594383
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-03-312018-12-31
Value6500525454585912
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest77.265.666.872.0

us-gaap:StatementEquityComponents

bxp:Noncontrollinginterestpropertypartnerships



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value17361728172016961710171117111699168516831530
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest20.621.621.521.120.920.820.920.720.620.819.3

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-55-48-51-51-48-47-45-47-49-50-51-53-50-52-73-79-56-14-201-11-9-9-10-10-11-12-12-13-13-14-14-15-16-16-17-17-18-19-20-21-21-24-23
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.7-0.6-0.7-0.6-0.6-0.6-0.6-0.6-0.6-0.6-0.6-0.7-0.6-0.7-0.9-1.0-0.7-0.2-0.30.0-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.4-0.4-0.6-0.5

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value63216294627462786414640764006391638463776370636363396333632663166306630563006293628662705684567956685662525052465232522251945184505049364916484647714417442443944381437335593416
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest75.178.578.578.378.578.078.077.878.078.778.778.880.079.880.580.079.580.078.178.878.679.380.781.080.980.477.978.590.192.791.490.991.591.291.390.890.289.087.186.786.586.383.677.9

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value11111111111111111111111111111111111111111111
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value63660060360862323302329232023052288227422582146214521332165218021772210220522162205132213221300130210581059548537566571556547558578593591616625628623570615
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest7.67.57.67.67.628.428.428.328.228.228.128.027.127.127.127.427.527.627.427.627.727.918.818.918.618.515.715.99.49.510.010.010.110.110.410.811.211.912.112.312.412.313.414.0

us-gaap:PreferredStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value2002002002002002002002002002002002002002002002002002002002002002002002002002002002002000
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest2.42.52.52.52.42.42.42.42.42.