UDR


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesAuthorized
us-gaap:SubsidiarySaleOfStock

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:Revenues

us-gaap:CostsAndExpenses
dei:LegalEntity

us-gaap:GeneralAndAdministrativeExpense
dei:LegalEntity

us-gaap:OperatingIncomeLoss
dei:LegalEntity

us-gaap:InterestExpense
dei:LegalEntity

us-gaap:InterestExpenseDebt
dei:LegalEntity

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet

us-gaap:ProfitLoss
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:Assets
dei:LegalEntity

us-gaap:Liabilities
dei:LegalEntity

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity

us-gaap:StockholdersEquity

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity

us-gaap:Land
dei:LegalEntity

us-gaap:LongTermDebt
dei:LegalEntity
us-gaap:DebtInstrument, dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:MinorityInterest

us-gaap:StockholdersEquity

us-gaap:CommonStockValue

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetIncomeLoss
dei:LegalEntity
us-gaap:StatementEquityComponents

us-gaap:ProfitLoss
dei:LegalEntity

us-gaap:DepreciationDepletionAndAmortization
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:ShareBasedCompensation

us-gaap:DeferredTaxLiabilities

us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity

udr:CasualtyRelatedRecoveriesChargesNet
dei:LegalEntity

udr:DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest
dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationDepreciationAmortization
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationInterestExpense
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeExpenses
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationPropertyOperatingExpense
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
udr:EquityMethodOfInvestmentSummarizedFinancialInformationOperatingIncomeLoss
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
udr:IncomeFromParticipatingLoan
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations

udr:InterestAndOtherIncomeIncludingDiscontinuedOperations
dei:LegalEntity
udr:LongTermIncentivePlanOperatingPartnershipUnitGrantsValue
us-gaap:PartnerCapitalComponents, dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

udr:LongTermIncentivePlanOperatingPartnershipUnitsVestingShares
us-gaap:PartnerTypeOfPartnersCapitalAccount

udr:LongTermIncentivePlanUnitGrantsVestingsNet
us-gaap:StatementEquityComponents
dei:LegalEntity
udr:NonCashLongTermIncentivePlanOperatingPartnershipUnitGrantsValue
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:NumberOfApartmentHomesAcquired
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
udr:NumberOfCommunitiesAcquired
dei:LegalEntity
udr:NumberOfCommunitiesEncumbered
us-gaap:DebtInstrument, dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity
us-gaap:LongtermDebtType

udr:OperatingLeaseLiabilitiesAmortization
dei:LegalEntity
us-gaap:StatementBusinessSegments
udr:OperatingLeaseOtherIncome
us-gaap:StatementBusinessSegments, dei:LegalEntity

udr:OperatingLeaseRightOfUseAssetAmortization
dei:LegalEntity

udr:OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

udr:OtherCostAndExpenseOperatingIncludingDiscontinuedOperations
dei:LegalEntity

udr:OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations
dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
udr:PercentageOfRevenueTotalLeaseRevenue
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:PropertyManagementCostsOperating
dei:LegalEntity

udr:RelatedPartyTransactionManagementFees
us-gaap:Ownership
udr:RentalRevenuesPercentOfParentRentalRevenue

udr:ReturnOnInvestmentInEquityMethodInvestments

udr:SameStoreCommunities
dei:LegalEntity
us-gaap:StatementBusinessSegments
udr:SegmentReportingInformationNetOperatingIncome
us-gaap:StatementBusinessSegments, dei:LegalEntity

udr:SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization
dei:LegalEntity

udr:SegmentReportingReconcilingItemsOwnedPropertyManagementCosts
dei:LegalEntity

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:LongtermDebtType
us-gaap:AmortizationOfDebtDiscountPremium

us-gaap:AmortizationOfFinancingCosts
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred

us-gaap:CapitalExpendituresIncurredButNotYetPaid
dei:LegalEntity

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
dei:LegalEntity

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ConversionOfStockSharesConverted1

us-gaap:DebtInstrumentInterestRateDuringPeriod
dei:LegalEntity
us-gaap:DebtInstrument, dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity
us-gaap:LongtermDebtType
us-gaap:Range, us-gaap:LongtermDebtType

us-gaap:DepreciationAndAmortization

us-gaap:DepreciationNonproduction
dei:LegalEntity
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:DirectCostsOfLeasedAndRentedPropertyOrEquipment
dei:LegalEntity

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:DividendsPreferredStock
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationRevenue
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

us-gaap:ExtinguishmentOfDebtAmount
us-gaap:LineOfCreditFacility
dei:LegalEntity
us-gaap:IncomeLossAttributableToNoncontrollingInterest
dei:LegalEntity
us-gaap:IncomeLossAttributableToParent

us-gaap:IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges

us-gaap:IncomeLossFromEquityMethodInvestments
dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
dei:LegalEntity
us-gaap:IncomeLossIncludingPortionAttributableToNoncontrollingInterest
us-gaap:PartnerCapitalComponents, dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:IncreaseDecreaseInOperatingAssets
dei:LegalEntity

us-gaap:IncreaseDecreaseInOperatingLiabilities
dei:LegalEntity

us-gaap:IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestCostsIncurredCapitalized
dei:LegalEntity
us-gaap:InterestExpenseRelatedParty

us-gaap:InterestIncomeRelatedParty

us-gaap:InterestPaidNet
dei:LegalEntity
dei:LegalEntity
us-gaap:LeaseCost
us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityAverageOutstandingAmount
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityInterestRateDuringPeriod
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
us-gaap:LongtermDebtType

us-gaap:MinorityInterestChangeInRedemptionValue
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToNonredeemableNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest
dei:LegalEntity
us-gaap:NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAndDiluted

us-gaap:NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable
dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:OperatingLeaseCost
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:OperatingLeaseLeaseIncome
dei:LegalEntity
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, dei:LegalEntity
us-gaap:StatementBusinessSegments
us-gaap:OperatingLeaseLeaseIncomeLeasePayments
us-gaap:StatementBusinessSegments, dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
udr:NoncontrollingInterestType

us-gaap:OtherCostAndExpenseOperating
dei:LegalEntity

us-gaap:OtherDepreciationAndAmortization

us-gaap:OtherInterestAndDividendIncome

us-gaap:OtherOperatingActivitiesCashFlowStatement
dei:LegalEntity
dei:LegalEntity
us-gaap:PartnersCapitalAccountDistributions
us-gaap:PartnerCapitalComponents, dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:PartnersCapitalAccountRedemptions

us-gaap:PaymentsForCapitalImprovements
dei:LegalEntity

us-gaap:PaymentsForProceedsFromLoansReceivable
dei:LegalEntity
us-gaap:PaymentsOfCapitalDistribution

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsMinorityInterest

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock

us-gaap:PaymentsToAcquireBuildings
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:PaymentsToAcquireBusinessesGross
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

us-gaap:PaymentsToAcquireFurnitureAndFixtures

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates

us-gaap:PaymentsToDevelopRealEstateAssets
us-gaap:StatementClassOfStock
us-gaap:PreferredStockDividendRatePercentage

us-gaap:PreferredStockDividendsIncomeStatementImpact
us-gaap:StatementEquityComponents
us-gaap:StatementClassOfStock
us-gaap:PreferredStockPerShareAmountsOfPreferredDividendsInArrears

us-gaap:ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
dei:LegalEntity
dei:LegalEntity
us-gaap:ProceedsFromPaymentsForLongTermLoansForRelatedParties

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromRepaymentsOfCommercialPaper

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ProceedsFromSaleOfRealEstate
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:StatementScenario

us-gaap:RealEstateTaxesAndInsurance
dei:LegalEntity
us-gaap:RelatedPartyTransactionsByRelatedParty, dei:LegalEntity
us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty

us-gaap:RepaymentsOfSecuredDebt

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
us-gaap:DebtInstrument
us-gaap:ShortTermDebtWeightedAverageInterestRateOverTime
us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:ShorttermDebtAverageOutstandingAmount
us-gaap:DebtInstrument
us-gaap:ShorttermDebtMaximumAmountOutstandingDuringPeriod

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:TransferToOtherRealEstate

us-gaap:VariableLeaseCost
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
dei:LegalEntity
us-gaap:WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

udr:AccumulatedDepreciationofRealEstateHeldforSale
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
udr:AggregateCommitmentOnNoteReceivable

udr:CostIncurredToDate
us-gaap:RealEstateProperties
us-gaap:RealEstateProperties, dei:LegalEntity

udr:DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentCommittedInvestment
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationAccountspayableandaccruedliabilities
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationCashandcashequivalents
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationOtherAssets
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
udr:EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
udr:EquityMethodInvestmentSummarizedFinancialInformationSecuredDebtNet
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
udr:EquityMethodInvestmentSummarizedFinancialInstrumentNoteReceivable
dei:LegalEntity
udr:GeneralPartnersCapitalAccountUnitsOwnedPercentage
us-gaap:Ownership
us-gaap:Ownership, dei:LegalEntity

udr:InvestmentBuildingAndBuildingImprovementsAndFurnitureFixturesAndEquipment
dei:LegalEntity
dei:LegalEntity
udr:LimitedPartnersCapitalAccountUnitsOutstandingPercentage
us-gaap:Ownership
us-gaap:Ownership, dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearEight
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearNine

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearSeven
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearSix
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearTen
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

udr:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearTen
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
udr:NoteReceivableInterestRate

udr:NumberOfApartmentHomesOwnedAndConsolidatedByCompany
dei:LegalEntity
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
udr:ParticipatingLoanInterestRateStatedPercentage
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:RealEstateHeldForInvestmentNetExcludingRealEstateUnderDevelopmentOrHeldForDisposition

udr:RealEstateOwnedGross
dei:LegalEntity
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, dei:LegalEntity

udr:RealEstateUnderDevelopmentAccumulatedDepreciation

udr:RealEstatesOwnedAccumulatedDepreciation
dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
udr:SecuredDebtIncludingDebtOnRealEstateHeldForSale
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FairValueByAssetClass
us-gaap:LongtermDebtType
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
udr:UnsecuredDebtInstrumentsFairValue
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
dei:LegalEntity

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent
dei:LegalEntity

us-gaap:AccumulatedDistributionsInExcessOfNetIncome

us-gaap:AdditionalPaidInCapital

us-gaap:AdvanceRent
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:DebtInstrument
us-gaap:CommercialPaperAtCarryingValue
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
us-gaap:StatementEquityComponents

us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, dei:LegalEntity
us-gaap:DebtInstrumentFairValue
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType
dei:LegalEntity
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:DebtInstrument, dei:LegalEntity
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:Range, us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass
us-gaap:LongtermDebtType
us-gaap:DebtInstrumentUnamortizedDiscount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DebtInstrumentUnamortizedPremium
us-gaap:DebtInstrument, dei:LegalEntity
us-gaap:DeferredFinanceCostsNet
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity
us-gaap:LongtermDebtType

us-gaap:DeferredGainOnSaleOfProperty
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral

us-gaap:DerivativeLiabilities

us-gaap:DevelopmentInProcess
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:DividendsPayableCurrentAndNoncurrent
dei:LegalEntity
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentOwnershipPercentage
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationAssets
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationEquity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationLiabilities
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities

us-gaap:EquityMethodInvestments
dei:LegalEntity
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity
dei:LegalEntity
us-gaap:GeneralPartnersCapitalAccount
us-gaap:Ownership
us-gaap:GeneralPartnersCapitalAccountUnitsOutstanding
us-gaap:Ownership, dei:LegalEntity
us-gaap:LongtermDebtType
us-gaap:GuaranteeObligationsMaximumExposure

us-gaap:InterestPayableCurrentAndNoncurrent
dei:LegalEntity

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure
dei:LegalEntity

us-gaap:LandImprovements
dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
dei:LegalEntity
us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LessorOperatingLeasePaymentsToBeReceived
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, dei:LegalEntity
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, dei:LegalEntity
dei:LegalEntity
us-gaap:LimitedPartnersCapitalAccount

us-gaap:LimitedPartnersCapitalAccountUnitsOutstanding
dei:LegalEntity
us-gaap:LimitedPartnersCapitalAccountByClass, dei:LegalEntity
us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:Ownership
us-gaap:Ownership, dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:LineOfCredit
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, dei:LegalEntity
us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacility
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
dei:LegalEntity
us-gaap:NotesPayableRelatedPartiesCurrentAndNoncurrent
us-gaap:DebtInstrument, dei:LegalEntity

us-gaap:NotesReceivableGross
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:NotesReceivableNet
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:NumberOfInterestRateDerivativesHeld

us-gaap:NumberOfRealEstateProperties
dei:LegalEntity
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:RealEstateProperties

us-gaap:NumberOfStatesInWhichEntityOperates
dei:LegalEntity
us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:NumberOfUnitsInRealEstateProperty
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:OperatingLeaseLiability
dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
dei:LegalEntity

us-gaap:OtherAssets
dei:LegalEntity
dei:LegalEntity
us-gaap:PartnersCapital

us-gaap:PartnersCapitalAccountUnits
dei:LegalEntity
us-gaap:Ownership
dei:LegalEntity
us-gaap:PartnersCapitalAttributableToNoncontrollingInterest
dei:LegalEntity
us-gaap:PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
us-gaap:PartnerCapitalComponents, dei:LegalEntity
us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity
us-gaap:StatementClassOfStock
us-gaap:PreferredStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:PreferredStockSharesOutstanding
us-gaap:StatementClassOfStock
us-gaap:PreferredStockValue

us-gaap:PurchaseCommitmentRemainingMinimumAmountCommitted
us-gaap:RealEstateProperties
us-gaap:RealEstateProperties, dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:RealEstateHeldforsale

us-gaap:RealEstateInvestmentPropertyAccumulatedDepreciation
dei:LegalEntity

us-gaap:RealEstateInvestmentPropertyAtCost
dei:LegalEntity

us-gaap:RealEstateInvestmentPropertyNet
dei:LegalEntity

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount

us-gaap:RedeemableNoncontrollingInterestEquityCommonCarryingAmount
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:RestrictedCashAndCashEquivalents
dei:LegalEntity

us-gaap:SecuredDebt
dei:LegalEntity
us-gaap:LongtermDebtType
us-gaap:SeniorNotes

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:UnsecuredDebt
us-gaap:LongtermDebtType

Tables

  2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:CommonStockValue ██████████████████████████▁▁▁▁▁2222222222222222222222222211111NA1NANA
us-gaap:CommonStockSharesIssued ██▆▅▂▂▂▂▂▂▁294292283281268267267267267267261NANANA255255251251250250250250250227219219196187182182163NA155NANA
us-gaap:CommonStockSharesOutstanding ██▆▅▃▃▃▃▃▃▁▂▁294292283281268267267267267267261262259NA255255251251250250250250250227219219196187182182163NA155NANA
us-gaap:CommonStockSharesAuthorized █████████████████████████▁▁▁▁▁▁350350350350350350350350350350350350350350350350350350350350350350350350350250250250250250250NA250NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▇▇▆▅▅▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▁295289282277268268269269268268266261262258256253252251251251249249234NANANANA182NA165160156NA150149
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▇▇▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▂▁294288281277267267267267266266260259257256253251250250249249249249234221NA213190182NA165160156NA150149
us-gaap:EarningsPerShareBasic ▂▂▃▂▂▂▅▂▂▂█▂▅▄▄▃▃▂▂▂▁▁█0.010.090.120.080.070.070.30.060.030.090.620.050.330.280.259999999999999950.160.120.070.010.020.0-0.040.62NANANANA-0.17-0.17000000000000004-0.16-0.18-0.17-0.16000000000000003-0.27-0.1
us-gaap:EarningsPerShareDiluted ▂▂▃▂▂▂▅▂▂▂█▂▅▄▄▃▃▂▂▂▁▁█0.010.090.120.080.070.070.30.060.030.090.610.050.330.280.249999999999999940.160.120.070.010.020.0-0.040.62NANANANA-0.17-0.17000000000000004-0.16-0.18-0.17-0.16000000000000003-0.27-0.1
  2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▁▁▁▁▁▁▁████▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅1622232251247243237221215219209206203198193191187186180175174192179169174161155146153151155
us-gaap:Revenues █▇▆▆▆▆▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▂▂▂▃▂▂▂▂▁▁▁▁▁321295281270266259253251247243237221215219209206203198193191187186180175174192179169174161155146153151155
us-gaap:CostsAndExpenses █▅▅▄▄▄▄▄▄▃▄▂▂▂▂▂▂▂▁▁▁▃▄▃▄▄▄▃▄▃▂▂▂▂▂282236221218211204205205201198202181176174175173170171159160156197204194203216208197202189182173178175169
 us-gaap:CostsAndExpenses dei:LegalEntity udr:UnitedDominionRealityLP▂▁▁▁▁▁▂▁▂▁▂▅▄▅▄▅▄▄▄▄▄██▅7874737373747574767475898687868886858483839910090NA106104NANA9085NANANANA
us-gaap:GeneralAndAdministrativeExpense ▅▄▄▄▃▄▃▄▃▄█▆▄▄▃▃▄▃▃▁▁▂▄▁141212121112111211131715131211111211119910139NANANANANANANANANANANA
 us-gaap:GeneralAndAdministrativeExpense dei:LegalEntity udr:UnitedDominionRealityLP▃▁▁▁▁▁▁▁▁▃▆██▃█▆█▆▆▃▃▁█▁544444444567757676655474NANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▆██▇▇▇▇▇▇▇▆▆▆▇▆▆▆▅▆▆▅▂▁▂▁▁▁▁▁▁▁▁▁▁▂385864525555484546453440394534333226343130-10-23-18-29-24-28-28-27-27-26-26-25-23-13
 us-gaap:OperatingIncomeLoss dei:LegalEntity udr:UnitedDominionRealityLP▇██▇█▇▇▆▆▆▆▅▆▅▄▄▄▃▄▄▄▂▂▁33373634353231302728262526222119181619191710105NANANANANANANANANANANA
us-gaap:InterestExpense ██▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▁▇▇▇▇█▇3942343334312930333033302928323331-32303030314134NANANANANANANANANANANA
 us-gaap:InterestExpense dei:LegalEntity udr:UnitedDominionRealityLP▇▇▇▇▆▆▆▆█▇▇██▁██▁█▂▁▁▁7777555511871010-101110-1010-8-9-10-9NANANANANANANANANANANANANA
us-gaap:InterestExpenseDebt ▆█▄▄▄▂▂▂▄▂▄▂▂▁3942343334312930333033302928NANANANANANANA3137393839373536373535353335
us-gaap:OtherNonoperatingIncomeExpense ▃▂▂█▂▂▃▁▁▁▁▁▁▁21191120000000NANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▃▅▅▅▄▄▄▄▄▅▃▄▃█▃▃▃▂▃▃▃▂▁▁5303828202219171126313975082-802-2-11-25-21NANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▂▂▂▂▂▂▂▂▂▂▁▂▁▂█▁▁▁▁▁▁▁0102000000-10-1034-2-2-3-2-2-1-2NA-22-60000-30NANANA0
us-gaap:IncomeTaxesPaidNet 323000.0NANA241000.0NANA-22000.0NANA171000.0NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▂▃▃▃▃▃▅▃▃▃█▃▅▅▄▄▃▃▂▂▂▂▇▅▄▂▃▁▁▁▁▁▁▁▂529382620228917112817713897667413119350-91568648-1314-28-29-24-27-25-25-39-12
 us-gaap:ProfitLoss dei:LegalEntity udr:UnitedDominionRealityLP▃▃▃▃▃▃▇▃▂▂█▂▄▃▃▂▃▃▂▂▂▁▄▁24272724282591211114115144736328243011107051-6NA-67NANA-6-2NANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▁▂▃▂▂▂▅▂▂▂█▂▅▄▄▃▃▂▁▂▁▁▇▅22630212020831610271678936757413119461-815083NA-188-28NANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▁▂▂▂▂▂▆▂▁▂█▁▃▂▂▂▂▁▁▁▁▁▄▃▁▁▁▁▁▁▁02211171021003221100000530000000NANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▂▃▃▃▃▃▅▃▂▃█▂▅▄▄▃▃▃▂▂▂▂▇▅▄▁▂▁▁▁▁22833232222901710291788966959433220471-91568648-188-28-28-23-28NANANANA
us-gaap:NetIncomeLoss ▂▃▃▃▃▃▅▃▃▃█▃▅▅▅▄▃▃▂▂▂▂▇▅▄▂▃▁▁▁▁▁▁▁▂527352418208116102516613867365403018350-91508346-1314-27-28-23-26-24-24-37-12
 us-gaap:NetIncomeLoss dei:LegalEntity udr:UnitedDominionRealityLP▃▃▃▃▃▃▇▃▂▂█▂▄▃▃▂▃▃▂▂▂▁▄▁▃▁▂▁24262723272491201013114144736328243011107051-631-67-2NA-6-2NANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:AccumulatedDistributionsInExcessOfNetIncome▁▃▄▃▂▂█5273524182081NANA2516613NANA65403018NANA0NANA8346-1314-27-28-23NANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▃▃▄▃▃▃▅▃▃▃█▃▅▅▅▄▃▃▂▃▂▂▇▅▄▂▃▁▁▁▁▁▂▁▂4263423171980159251611285726439291724-1-91458044-1512-30-30-26-28-26-24-40-14
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄00000000000000000NANANANANA00000020-1NA3-10
  2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:Assets █▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▃▄▂▂▂▂▁9691869781977955767877077709776077677735766369226939685868466898693268346756674368906910697269426721680459615501552954775079NA5132NANA
 us-gaap:Assets dei:LegalEntity udr:UnitedDominionRealityLP▂▂▁▂▁▁▁▁▂▂▃▅▅▅▆▆▆▆█████23672355234023632281230923342316234923782554278228052843287829062926294031223126312631623178NA329234263128NA2861NANANANANANA
us-gaap:Liabilities █▄▃▂▃▃▂▂▂▂▂▂▂▂▂▂▃▂▁▁▂▁▁▃▃▄▂▂▂▁▁5393435342283941407840163947396439013791381637353790373538283869398238513706363837333621361441524166426539433741380036843592NA3634NANA
 us-gaap:Liabilities dei:LegalEntity udr:UnitedDominionRealityLP▆▅▅▅▁▁▁▁▁▃▄▇▇▇▇▇▇██████1037955910906530524527528523706833110510991114114411701170118712071199121512301223NA143815151510NA1299NANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity █▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▃▄▂▂▂▂▁9691869781977955767877077709776077677735766369226939685868466898693268346756674368906910697269426721680459615501552954775079NA5132NANA
 us-gaap:LiabilitiesAndStockholdersEquity dei:LegalEntity udr:UnitedDominionRealityLP▂▂▁▂▁▁▁▁▂▂▃▅▅▅▆▆▆▆█████23672355234023632281230923342316234923782554278228052843287829062926294031223126312631623178NA329234263128NA2861NANANANANANA
us-gaap:StockholdersEquity █▇▆▆▅▆▆▆▆▇▆▆▆▆▆▆▅▆▆▆▆▇▇▅▄▄▃▂▂▂▁3464324629492948259327572877284528923036289928742857281027352778268227412828286629313051311025332314232618261633160616721369NA1395NANA
  2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▁▁▁▄█▁▁▁▂▁▁▁▁▂▁▂▁01011111126126151426151197821843121321119108195244
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 us-gaap:Land dei:LegalEntity udr:UnitedDominionRealityLP▁▁▁▁▁▁▁▇▇██711711711711711712712816814837833NANANA1008NANANANANANANA1013NA1008NANANANANANANANANANA
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 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType udr:FixedRateDebt,us-gaap:SecuredDebt█▂▁▁▃▃▃▃▃▄▆▆▆▆▆▇▇▇███1117573503505703676677681683754952971975978969106110651068107510781082NANANANANANANANANANANANANANA
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 us-gaap:LongTermDebt us-gaap:LongtermDebtType us-gaap:UnsecuredDebt█▆▆▅▅▅▅▄▄▃▂▂▂▂▂▂▂▂▁▁▁374033353272299030122952287928742828250521932166221321452221222823452185208120092073NANANANANANANANANANANANANANA
us-gaap:MinorityInterest ▅█▆▅▅▄▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂1425181314118753000000000003444433333NA3NANA
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us-gaap:StockholdersEquity █▇▆▆▅▆▆▆▆▇▆▆▆▆▆▆▅▆▆▆▆▇▇▅▄▄▃▂▂▂▁3464324629492948259327572877284528923036289928742857281027352778268227412828286629313051311025332314232618261633160616721369NA1395NANA
us-gaap:CommonStockValue ██████████████████████████▁▁▁▁▁2222222222222222222222222211111NA1NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▂▄▅▇███▆▆▆▂▁▄▁▄█▇▇▅▅▄▂▂▂▂▁▃▇▇▇▇-12-9-7-20-1-1-4-4-4-12-14-9-15-80-2-3-6-7-9-13-13-13-13-15-10-3-3-3-3NA0NANA
  2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities 135NANA137NANA132NANA12012588120961109510382NANA66NANA7061676747565560413965NA
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity udr:UnitedDominionRealityLP65NANA68NANA70NANA644763575750545448NANA42NANA45NA47NANANA46NANANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities -214NANA-459NANA-24NANA-162-10-64-114-497-21-142-136NANA-101NANA-22433-820-209-56-104-356-64-57-62-105NA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity udr:UnitedDominionRealityLP-6NANA-9NANA86NANA-747-1811-16-20-23-3128NANA-26NANA-17NA-299NANANA-15NANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities 68NANA137NANA-108NANA42-110-26-10-55-117-865039NANA29NANA145-957441521147302-729360NA
  2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities 135NANA137NANA132NANA12012588120961109510382NANA66NANA7061676747565560413965NA
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity udr:UnitedDominionRealityLP65NANA68NANA70NANA644763575750545448NANA42NANA45NA47NANANA46NANANANANA
us-gaap:NetIncomeLoss ▂▃▃▃▃▃▅▃▃▃█▃▅▅▅▄▃▃▂▂▂▂▇▅▄▂▃▁▁▁▁▁▁▁▂527352418208116102516613867365403018350-91508346-1314-27-28-23-26-24-24-37-12
 us-gaap:NetIncomeLoss dei:LegalEntity udr:UnitedDominionRealityLP▃▃▃▃▃▃▇▃▂▂█▂▄▃▃▂▃▃▂▂▂▁▄▁▃▁▂▁24262723272491201013114144736328243011107051-631-67-2NA-6-2NANANANA
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:AccumulatedDistributionsInExcessOfNetIncome▁▃▄▃▂▂█5273524182081NANA2516613NANA65403018NANA0NANA8346-1314-27-28-23NANANANANA
us-gaap:ProfitLoss ▂▃▃▃▃▃▅▃▃▃█▃▅▅▄▄▃▃▂▂▂▂▇▅▄▂▃▁▁▁▁▁▁▁▂529382620228917112817713897667413119350-91568648-1314-28-29-24-27-25-25-39-12
 us-gaap:ProfitLoss dei:LegalEntity udr:UnitedDominionRealityLP▃▃▃▃▃▃▇▃▂▂█▂▄▃▃▂▃▃▂▂▂▁▄▁24272724282591211114115144736328243011107051-6NA-67NANA-6-2NANANANA
us-gaap:DepreciationDepletionAndAmortization 157NANA114NANA109NANA10610692929093909089NANA84NANA9598989285837675737270NA
 us-gaap:DepreciationDepletionAndAmortization dei:LegalEntity udr:UnitedDominionRealityLP35NANA34NANA37NANA363743444445454444NANA45NANA51NA51NANANA41NANANANANA
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us-gaap:NetCashProvidedByUsedInInvestingActivities -214NANA-459NANA-24NANA-162-10-64-114-497-21-142-136NANA-101NANA-22433-820-209-56-104-356-64-57-62-105NA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity udr:UnitedDominionRealityLP-6NANA-9NANA86NANA-747-1811-16-20-23-3128NANA-26NANA-17NA-299NANANA-15NANANANANA
  2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities 68NANA137NANA-108NANA42-110-26-10-55-117-865039NANA29NANA145-957441521147302-729360NA
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 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:LongtermDebtType udr:ThreePointTwoFourPercentDueOnTwoThousandThirty0.0324NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value22222222222222222222222222222222222111111
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Par Or Stated Value Per Share

Shares Issued

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value294294292283281275268267267267267267267267267267267261255255251251250250250250250250250227219219196187182182163155
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value294294292283281275268267267267267267267267267267267261262259255255251251250250250250250250250227219219196187182182163155
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350350250250250250250250250
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SubsidiarySaleOfStock

udr:ForwardSalesAgreement



Period End2020-03-312019-09-30
Value21
Percentage of CommonStockSharesAuthorized0.60.4

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value2952942892822772702682682690269268268271268268264266261262258256253252251249251251249249234182165160156150149
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-312009-09-302009-06-30
Value2942932882812772702672672670267266266266266266262260259257256253251250250249249249249249234221213190182165160156150149
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value0.010.330.090.120.080.30.070.070.30.260.060.030.090.890.10.060.040.620.050.330.280.259999999999999950.160.120.070.010.020.0-0.040.62-0.17-0.17000000000000004-0.16-0.18-0.17-0.16000000000000003-0.27-0.1
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value0.010.330.090.120.080.30.070.070.30.250.060.030.090.880.10.060.040.610.050.330.280.249999999999999940.160.120.070.010.020.0-0.040.62-0.17-0.17000000000000004-0.16-0.18-0.17-0.16000000000000003-0.27-0.1
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value1622232251247243237221215219209206203198193191187186180175174192179169174161155146153151155
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value321295281270266259253251247243237221215219209206203198193191187186180175174192179169174161155146153151155
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23161.54625.69887.89839.19215.58354.68976.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Costs And Expenses

us-gaap:CostsAndExpenses



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value282236221218211204205205201198193197197196202181176174175173170171159160156197204194203216208197202189182173178175169
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20355.03704.07791.47930.97310.76579.77274.781.981.481.30.00.00.00.085.381.881.879.483.684.083.986.682.283.683.7105.8113.0110.5116.9112.5115.9116.7116.0117.2117.0118.1116.6115.7109.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value7874737373747574767472737172758986878688868584838399100901061049085
Percentage of CostsAndExpenses27.731.533.133.935.036.336.536.138.137.637.437.436.536.937.049.349.250.049.650.750.650.152.952.053.050.749.046.749.250.247.846.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5641.21166.82579.62685.92559.82389.72657.829.631.030.60.00.00.00.031.640.340.339.741.542.642.443.443.543.544.353.755.351.655.358.256.154.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value14121212111211121113131110131715131211111211119910139
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1079.1191.0433.7453.2411.9398.0416.75.04.65.40.00.00.00.07.67.16.45.55.65.66.26.15.95.15.15.47.65.3

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value5444444445443567757676655474
Percentage of GeneralAndAdministrativeExpense35.433.333.637.434.836.736.633.238.639.937.139.235.539.235.650.151.246.461.260.159.558.160.359.758.846.253.152.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax382.463.7145.9169.4143.5146.2152.71.61.82.10.00.00.00.02.73.63.32.63.43.43.73.53.53.13.02.54.02.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value38586452555548454645494541383440394534333226343130-10-23-18-29-24-28-28-27-27-26-26-25-23-13
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2806.5921.62282.11908.21904.81774.81701.418.118.618.70.00.00.00.014.718.218.220.616.416.016.113.417.816.416.3-5.8-13.0-10.5-16.9-12.5-15.9-16.7-16.0-17.2-17.0-18.1-16.6-15.7-9.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value3337363435323130272829282926262526222119181619191710105
Percentage of OperatingIncomeLoss86.963.256.965.664.759.865.868.058.961.660.462.969.668.577.364.366.850.661.358.456.262.057.561.155.9-93.7-46.4-28.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2439.8582.31299.11252.11233.11060.51119.312.311.011.50.00.00.00.011.311.712.210.410.09.49.18.310.210.09.15.46.02.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value394234333431293033302931303133302928323331-32303030314134
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2832.6665.91209.71219.31191.21016.31061.112.013.712.50.00.00.00.014.013.713.713.115.616.015.6-16.616.016.116.517.123.019.7

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value77775555118777771010-101110-1010-8-9-10-9
Percentage of InterestExpense19.017.721.422.014.816.116.816.834.428.225.423.324.724.523.336.136.8-37.433.831.6-32.1-30.5-28.4-29.4-32.3-30.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax537.8117.8258.5267.9176.6163.5178.12.04.73.50.00.00.00.03.34.95.1-4.95.35.1-5.05.1-4.5-4.7-5.3-5.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest And Debt Expense

Interest Expense Debt

us-gaap:InterestExpenseDebt



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value3942343334312930333029313031333029283137393839373536373535353335
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2832.6665.91209.71219.31191.21016.31061.112.013.712.50.00.00.00.014.013.713.713.117.120.722.322.320.620.821.121.123.023.124.023.222.422.7

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value00002212854444699999-988889121213131212
Percentage of InterestExpenseDebt1.91.30.50.66.06.46.66.725.418.215.013.814.714.618.532.332.933.40.00.00.00.00.00.00.029.433.231.934.636.333.133.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax53.58.45.76.970.965.369.90.83.52.30.00.00.00.02.64.44.54.44.74.5-4.44.54.44.64.85.06.97.17.17.57.67.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value211911200000000000
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax194.529.446.0356.741.136.397.80.20.20.20.00.00.00.00.20.20.20.2

Income Loss From Continuing Operations

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value53038282022191711265629118313975082-802-2-11-25-21
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax411.0484.21351.21047.4706.9729.4678.77.04.610.90.00.00.00.01.35.94.434.6-0.33.91.1-4.30.31.4-1.2-6.2-14.4-12.0

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

Income Loss From Continuing Operations Attributable To Noncontrolling Entity

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-06-30
Value0102000000000-10-1034-2-2-3-2-2-1-2-22-60000-300
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.823.54.480.45.57.58.00.10.10.10.00.00.0-0.6-0.3-0.7-0.216.2-1.2-1.1-1.7-1.4-1.4-1.1-1.6-13.0-3.90.20.00.0-0.0-1.90.10.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-03-312018-03-312017-03-312016-03-31
Value323000.0241000.0-22000.0171000.0267000.0
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax23.38.8-0.80.10.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value5105293826892022897517112825929191117713897667413119350-91568648-1314-28-29-24-27-25-25-39-12
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax399.10.0460.71346.9967.00.0701.5721.93161.80.07.04.511.60.00.00.00.074.66.241.634.832.320.315.39.61.72.8-0.2-5.286.549.227.6-7.28.3-17.0-16.8-15.2-17.7-17.1-16.8-26.3-8.1

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value2424272724862825916121111411115115144736328243011107051-6-67-6-2
Percentage of ProfitLoss444.823.392.772.691.596.3138.9112.2102.981.4120.1101.249.340.358.244.265.3109.253.148.148.521.179.1162.1341.6190.9-2515.9-1.332.9-8.047.950.427.89.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1775.20.0427.2977.5884.60.0974.2809.93254.60.08.44.55.70.00.00.048.76.822.116.715.74.312.115.65.75.34.20.128.4-3.9-3.44.2-4.2-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value22630212020831610272422817111678936757413119461-815083-188-28
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax201.7407.51081.0785.2700.0658.42946.96.54.111.20.00.00.00.070.73.743.130.627.420.315.410.02.33.60.8-4.683.447.2-9.64.5-16.6

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0221117102222101003221100000530000000
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.033.281.567.162.358.9269.40.60.41.00.00.00.00.04.50.11.51.11.00.70.60.40.00.10.0-0.33.31.9-0.0-0.0-0.0-0.5-0.0-0.0-0.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value22833232222901710292653118111788966959433220471-91568648-188-28-28-23-28
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax214.7440.61162.5852.3762.3717.33216.37.14.412.20.00.00.00.075.13.844.631.728.421.016.010.32.33.70.8-4.986.749.227.6-9.54.5-16.6-16.1-14.7-18.5

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value527352418208116102523726171016613867365403018350-91508346-1314-27-28-23-26-24-24-37-12
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax376.2426.01252.0890.7644.4662.62897.16.44.110.60.00.00.00.070.06.040.233.631.219.614.79.31.62.7-0.1-4.883.247.326.7-6.98.2-16.5-16.3-14.7-17.1-16.4-16.2-25.1-7.7

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value242326272385272491612010135011114114144736328243044111070051-631-67-2-6-2
Percentage of NetIncomeLoss461.90.098.676.997.70.0148.8120.2111.80.0128.1106.852.621.342.761.546.169.1110.054.649.249.921.381.4166.30.0345.4195.6-2884.00.0-0.934.0-8.367.450.051.07.328.89.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1737.60.0420.2962.9870.40.0959.0796.43239.80.08.34.45.60.00.00.00.048.46.622.016.515.64.212.015.40.05.75.34.10.00.028.3-3.918.0-3.44.2-1.2-4.2-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value527352418208125261710166136540301808346-1314-27-28-23
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax376.2426.01252.0890.7644.4662.62897.110.60.00.00.070.06.031.219.614.79.3-0.147.326.7-6.98.2-16.5-16.3-14.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedDistributionsInExcessOfNetIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value426342381171980681592523626179161128572643929173524-1-13-91458044-1512-30-30-26-28-26-24-40-14
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax299.4409.81215.7853.90.0610.8631.42863.30.06.13.710.30.00.00.00.067.95.639.833.230.819.214.38.80.01.22.2-0.60.0-5.380.646.025.3-8.16.8-17.9-17.6-16.1-18.6-18.0-16.2-26.9-9.5

Net Income Loss Available To Common Stockholders Diluted

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312009-09-302009-06-30
Value00000000000000000000000000020-13-10
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.91.71.51.11.02.8-0.00.00.00.00.00.00.0-0.0-0.00.00.0-0.0-0.00.00.00.00.00.00.00.01.7-0.5-0.72.2-1.2-0.4

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value96919636869781977955771176787707770977337760776777357679765176107601766369226939685868466898693268346807675667436890688869106972694267216804596155015529547750795132
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value236723982355234023632304228123092334239523162349237824152451248225132554278228052843287829062926294029933122312631263136316231783292342631282861
Percentage of Assets24.424.927.128.629.729.929.730.030.331.029.930.230.731.532.032.633.133.340.240.441.542.042.142.243.044.046.246.445.445.545.845.649.050.352.551.7
Percentage of Assets24.424.927.128.629.729.929.730.030.331.029.930.230.731.532.032.633.133.340.240.441.542.042.142.243.044.046.246.445.445.545.845.649.050.352.551.7
Percentage of Assets udr:UnitedDominionRealityLP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value53935228435342283941381640784016394739493964390137913673382437313657381637353790373538283869398238513777370636383733367136213614415241664265394337413800368435923634
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets55.754.350.151.649.549.553.152.151.251.151.150.249.047.850.049.048.149.854.054.654.555.956.157.456.455.554.954.054.253.352.451.859.862.062.766.268.068.767.370.770.8

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value10371032955910906818530524527520528523706797806813846833110510991114114411701170118711901207119912151217123012231438151515101299
Percentage of Liabilities19.219.821.921.523.021.513.013.113.413.213.313.418.621.721.121.823.121.829.629.029.829.930.229.430.831.532.633.032.633.234.033.934.535.538.334.2
Percentage of Assets10.710.711.011.111.410.66.96.86.86.76.86.79.110.410.510.711.110.916.015.816.316.717.016.917.417.517.917.817.617.717.817.621.422.325.323.5
Percentage of Assets udr:UnitedDominionRealityLP43.843.140.638.938.435.523.222.722.621.722.822.329.733.032.932.833.732.639.739.239.239.840.340.040.439.838.738.338.938.838.938.543.744.248.345.4

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value96919636869781977955771176787707770977337760776777357679765176107601766369226939685868466898693268346807675667436890688869106972694267216804596155015529547750795132
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value236723982355234023632304228123092334239523162349237824152451248225132554278228052843287829062926294029933122312631263136316231783292342631282861
Percentage of LiabilitiesAndStockholdersEquity24.424.927.128.629.729.929.730.030.331.029.930.230.731.532.032.633.133.340.240.441.542.042.142.243.044.046.246.445.445.545.845.649.050.352.551.7
Percentage of Assets24.424.927.128.629.729.929.730.030.331.029.930.230.731.532.032.633.133.340.240.441.542.042.142.243.044.046.246.445.445.545.845.649.050.352.551.7
Percentage of Assets udr:UnitedDominionRealityLP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value34643358324629492948290525932757287728252845289230363093292229462972289928742857281027352778268227412811282828662931299230513110253323142326182616331606167213691395
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets35.734.937.336.037.137.733.835.837.336.536.737.239.240.338.238.739.137.841.541.241.039.940.338.740.141.341.942.542.543.444.244.636.534.434.230.629.729.130.527.027.2

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302008-12-312007-12-31
Value081011851112112235361261514261530119712821843121321119108195244123
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.10.00.00.02.40.00.00.00.00.00.00.00.00.00.10.00.10.00.00.10.20.20.40.20.40.20.10.10.21.22.60.10.20.20.40.20.20.20.20.00.10.00.00.00.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-302010-06-302009-12-31
Value0000000000000001130000110123221100470000
Percentage of CashAndCashEquivalentsAtCarryingValue4.10.32.15.15.70.17.77.96.814.412.46.035.135.81.429.730.046.09.95.513.23.310.24.45.46.321.735.441.423.12.30.627.05.630.335.69.79.14.47.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.00.00.00.0
Percentage of Assets udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.00.10.00.00.00.00.10.00.00.10.10.10.10.10.10.00.00.00.10.20.00.00.00.0

Land

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2163216420201965195418491824185117731780178817881812180117871794176318331790185618391919197017991693
Percentage of Land100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets22.322.523.224.024.624.023.824.023.023.023.023.023.423.523.423.623.223.926.126.626.528.629.030.230.6

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312012-06-302011-12-31
Value711711711711711711711712712719816814837836832835833833100810131008
Percentage of Land32.932.935.236.236.438.539.038.540.240.445.645.646.246.446.646.647.345.556.354.652.5
Percentage of Assets7.37.48.28.78.99.29.39.29.29.310.510.510.810.910.911.011.010.914.714.515.0
Percentage of Assets udr:UnitedDominionRealityLP30.029.730.230.430.130.931.230.930.530.035.234.735.234.633.933.733.232.635.031.930.6

Investments In Affiliates Subsidiaries Associates And Joint Ventures

Finite Lived Intangible Assets Net

Deferred Tax Assets Liabilities Net

Long Term Debt

us-gaap:LongTermDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value4885470739353870358935473811375236803671367936343537340135443465341135703513356435163583362837473628352334633394349934093918
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets50.448.945.347.245.146.049.648.747.747.547.446.845.744.346.345.544.946.650.751.451.352.352.654.153.151.851.350.350.849.558.3

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value9999
Percentage of LongTermDebt2.02.1
Percentage of Assets1.01.0
Percentage of Assets udr:UnitedDominionRealityLP4.24.1

us-gaap:DebtInstrument, dei:LegalEntity

udr:FixedRateDebt, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value7272
Percentage of LongTermDebt1.51.5
Percentage of Assets0.70.7
Percentage of Assets udr:FixedRateDebt udr:UnitedDominionRealityLP0.00.0

udr:VariableRateDebt, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value2626
Percentage of LongTermDebt0.60.6
Percentage of Assets0.30.3
Percentage of Assets udr:VariableRateDebt udr:UnitedDominionRealityLP0.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value1117112257350350550670367667767968168375475667483195095297197597896910611065106810721075107810821086
Percentage of LongTermDebt22.923.814.613.014.114.318.518.018.418.518.518.821.322.219.024.027.926.727.727.427.827.129.328.429.530.431.131.830.931.9
Percentage of Assets11.511.66.66.16.46.69.28.88.88.88.88.89.89.88.810.912.512.414.014.014.314.215.415.415.615.815.916.015.715.8
Percentage of Assets udr:FixedRateDebt us-gaap:SecuredDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

udr:VariableRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value26262694949494123123123123123277374374424424424375375392392337337374369306306343343
Percentage of LongTermDebt0.60.60.72.42.62.72.53.33.43.43.43.47.811.010.612.212.411.910.710.511.210.99.39.010.310.58.89.09.810.1
Percentage of Assets0.30.30.31.21.21.21.21.61.61.61.61.63.64.94.95.65.65.55.45.45.75.74.94.95.55.44.54.55.05.0
Percentage of Assets udr:VariableRateDebt us-gaap:SecuredDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value11441149600598599601798799801803804806103111301048125613741376134613501370136113991402144214421381138514251430
Percentage of LongTermDebt23.424.415.315.516.716.920.921.321.821.921.922.229.233.229.636.240.338.638.337.939.038.038.637.439.840.939.940.840.741.9
Percentage of Assets11.811.96.97.37.57.810.410.410.410.410.410.413.314.713.716.518.118.019.519.520.019.920.320.221.121.220.520.520.720.8
Percentage of Assets us-gaap:SecuredDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnsecuredDebt



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
Value374035583335327229902946301229522879286828742828250522702495220920372193216622132145222122282345218520812081200920731979
Percentage of LongTermDebt76.675.684.784.583.383.179.178.778.278.178.177.870.866.870.463.859.761.461.762.161.062.061.462.660.259.160.159.259.358.1
Percentage of Assets38.636.938.339.937.638.239.238.337.337.137.036.432.429.632.629.026.828.631.331.931.332.432.333.832.030.630.829.830.128.7
Percentage of Assets us-gaap:UnsecuredDebt0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1430251813171411897533320000000000000034444333333
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.30.30.20.20.20.20.10.10.10.10.10.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.1

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value34643358324629492948290525932757287728252845289230363093292229462972289928742857281027352778268227412811282828662931299230513110253323142326182616331606167213691395
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets35.734.937.336.037.137.733.835.837.336.536.737.239.240.338.238.739.137.841.541.241.039.940.338.740.141.341.942.542.543.444.244.636.534.434.230.629.729.130.527.027.2

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value22222222222222222222222222222222222111111
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value-12-10-9-7-200-1-1-2-4-4-4-5-11-12-12-12-14-9-15-80-2-3-5-6-7-9-11-13-13-13-13-15-10-3-3-3-30
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.1-0.1-0.1-0.1-0.0-0.00.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.1-0.2-0.1-0.0-0.0-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.10.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value13513713212012588120961109510382667061676747565560413965
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9759.14992.14686.649.353.040.156.043.752.746.350.941.735.639.835.235.237.428.432.434.438.628.325.943.4

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value65687064476357575054544842454746
Percentage of NetCashProvidedByUsedInOperatingActivities48.350.053.653.538.071.747.759.945.556.852.859.063.865.170.583.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4712.22494.62510.626.420.128.826.726.224.026.326.924.622.725.924.828.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-214-459-24-162-10-64-114-497-21-142-136-101-22433-820-209-56-104-356-64-57-62-105
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15421.0-16712.1-871.2-66.8-4.3-29.1-52.9-22.53.5-10.3-70.1-69.0-54.0-127.519.3-426.2-116.5-33.6-60.0-220.2-41.6-39.1-40.7-69.9

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value-6-986-747-1811-16-20-23-3128-26-17-299-15
Percentage of NetCashProvidedByUsedInInvestingActivities2.92.1-351.34.9-465.529.0-10.034.1-279.1111.522.1-21.126.48.036.44.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-440.6-351.13060.8-3.320.1-8.45.3-7.7-9.7-11.5-15.514.6-14.2-10.2-155.3-9.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value68137-10842-110-26-10-55-117-86503929145-957441521147302-729360
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4915.45004.7-3850.017.5-46.4-11.8-4.6-25.2-55.8-41.924.620.115.782.6-55.0386.884.66.627.2187.0-4.720.32.439.7

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value-59-58-157-55-92-45-69-40-30-30-22-78-15-27247-30
Percentage of NetCashProvidedByUsedInFinancingActivities-86.7-42.6144.5-130.884.1172.9695.772.726.435.0-45.7-197.3-53.6-18.933.2-10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4261.5-2129.7-5563.8-22.9-39.0-20.3-32.3-18.3-14.8-14.7-11.3-39.7-8.4-15.6128.6-18.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value13513713212012588120961109510382667061676747565560413965
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9759.14992.14686.649.353.040.156.043.752.746.350.941.735.639.835.235.237.428.432.434.438.628.325.943.4

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value65687064476357575054544842454746
Percentage of NetCashProvidedByUsedInOperatingActivities48.350.053.653.538.071.747.759.945.556.852.859.063.865.170.583.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4712.22494.62510.626.420.128.826.726.224.026.326.924.622.725.924.828.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value527352418208116102523726171016613867365403018350-91508346-1314-27-28-23-26-24-24-37-12
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax376.2426.01252.0890.7644.4662.62897.16.44.110.60.00.00.00.070.06.040.233.631.219.614.79.31.62.7-0.1-4.883.247.326.7-6.98.2-16.5-16.3-14.7-17.1-16.4-16.2-25.1-7.7

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value242326272385272491612010135011114114144736328243044111070051-631-67-2-6-2
Percentage of NetIncomeLoss461.90.098.676.997.70.0148.8120.2111.80.0128.1106.852.621.342.761.546.169.1110.054.649.249.921.381.4166.30.0345.4195.6-2884.00.0-0.934.0-8.367.450.051.07.328.89.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1737.60.0420.2962.9870.40.0959.0796.43239.80.08.34.45.60.00.00.00.048.46.622.016.515.64.212.015.40.05.75.34.10.00.028.3-3.918.0-3.44.2-1.2-4.2-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value527352418208125261710166136540301808346-1314-27-28-23
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax376.2426.01252.0890.7644.4662.62897.110.60.00.00.070.06.031.219.614.79.3-0.147.326.7-6.98.2-16.5-16.3-14.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedDistributionsInExcessOfNetIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value5105293826892022897517112825929191117713897667413119350-91568648-1314-28-29-24-27-25-25-39-12
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax399.10.0460.71346.9967.00.0701.5721.93161.80.07.04.511.60.00.00.00.074.66.241.634.832.320.315.39.61.72.8-0.2-5.286.549.227.6-7.28.3-17.0-16.8-15.2-17.7-17.1-16.8-26.3-8.1

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value2424272724862825916121111411115115144736328243011107051-6-67-6-2
Percentage of ProfitLoss444.823.392.772.691.596.3138.9112.2102.981.4120.1101.249.340.358.244.265.3109.253.148.148.521.179.1162.1341.6190.9-2515.9-1.332.9-8.047.950.427.89.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1775.20.0427.2977.5884.60.0974.2809.93254.60.08.44.55.70.00.00.048.76.822.116.715.74.312.115.65.75.34.20.128.4-3.9-3.44.2-4.2-1.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value15711410910610310710710610692929093909089849598989285837675737270
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value35343736374344444545444445515141
Percentage of DepreciationDepletionAndAmortization22.430.434.234.635.047.647.949.248.349.649.649.453.754.352.654.3

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-214-459-24-162-10-64-114-497-21-142-136-101-22433-820-209-56-104-356-64-57-62-105
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15421.0-16712.1-871.2-66.8-4.3-29.1-52.9-22.53.5-10.3-70.1-69.0-54.0-127.519.3-426.2-116.5-33.6-60.0-220.2-41.6-39.1-40.7-69.9

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value-6-986-747-1811-16-20-23-3128-26-17-299-15
Percentage of NetCashProvidedByUsedInInvestingActivities2.92.1-351.34.9-465.529.0-10.034.1-279.1111.522.1-21.126.48.036.44.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-440.6-351.13060.8-3.320.1-8.45.3-7.7-9.7-11.5-15.514.6-14.2-10.2-155.3-9.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value68137-10842-110-26-10-55-117-86503929145-957441521147302-729360
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4915.45004.7-3850.017.5-46.4-11.8-4.6-25.2-55.8-41.924.620.115.782.6-55.0386.884.66.627.2187.0-4.720.32.439.7

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value-59-58-157-55-92-45-69-40-30-30-22-78-15-27247-30
Percentage of NetCashProvidedByUsedInFinancingActivities-86.7-42.6144.5-130.884.1172.9695.772.726.435.0-45.7-197.3-53.6-18.933.2-10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4261.5-2129.7-5563.8-22.9-39.0-20.3-32.3-18.3-14.8-14.7-11.3-39.7-8.4-15.6128.6-18.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax udr:UnitedDominionRealityLP0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments For Repurchase Of Common Stock

Debt Instrument Interest Rate Stated Percentage

us-gaap:LongtermDebtType

us-gaap:DebtInstrumentInterestRateStatedPercentage

udr:ThreePointTwoFourPercentDueOnTwoThousandThirty



Period End2020-03-31
Value0.0324
Percentage of DebtInstrumentInterestRateStatedPercentage100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.0
Percentage of LongTermDebtAndCapitalLeaseObligations udr:ThreePointTwoFourPercentDueOnTwoThousandThirty0.0

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 End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value653323333544
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities



Period End2020-03-312019-12-312019-09-302018-12-312011-12-312010-12-312009-12-31
Value1110000
Percentage of DeferredTaxLiabilities100.0100.0100.0100.00.0100.0100.0

Deferred Tax Assets Net

Unrecognized Tax Benefits

Deferred Tax Assets Valuation Allowance

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value2032041359394
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value2042051359393
Percentage of OperatingLeaseRightOfUseAsset100.6100.799.999.999.8

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
Value2233232424208283020212221222227
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



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
Value141414141413131313121212131214
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents61.842.162.359.058.26.648.442.762.759.057.858.558.556.352.5

udr:CasualtyRelatedRecoveriesChargesNet



Period End2020-03-312019-09-302018-09-30
Value1-10
Percentage of CasualtyRelatedRecoveriesChargesNet100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302018-09-30
Value0-10
Percentage of CasualtyRelatedRecoveriesChargesNet-0.2100.0-1.5

udr:DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value6113113212
Percentage of DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302018-09-302017-06-30
Value400000.0300000.00.0100000.0
Percentage of DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest5.815.80.05.9

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentSummarizedFinancialInformationDepreciationAmortization

udr:UnconsolidatedJointVentures



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value162628292928262524-23-21-21-18-18-19-19-24-24-24222121242625181716161255
Percentage of EquityMethodInvestmentSummarizedFinancialInformationDepreciationAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value202020202222
Percentage of EquityMethodInvestmentSummarizedFinancialInformationDepreciationAmortization129.279.273.168.674.877.1

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentSummarizedFinancialInformationInterestExpense

udr:UnconsolidatedJointVentures



Period End2020-03-312019-09-302019-03-312018-09-30
Value10202122
Percentage of EquityMethodInvestmentSummarizedFinancialInformationInterestExpense100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-03-312018-09-30
Value3433
Percentage of EquityMethodInvestmentSummarizedFinancialInformationInterestExpense35.020.017.714.6

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeExpenses

udr:UnconsolidatedJointVentures



Period End2020-03-312019-03-31
Value-8000.0103000.0
Percentage of EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeExpenses100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-03-31
Value11
Percentage of EquityMethodInvestmentSummarizedFinancialInformationOtherIncomeExpenses-23612.51930.1

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentSummarizedFinancialInformationPropertyOperatingExpense

udr:UnconsolidatedJointVentures



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value152729303028262422-21-16-22-23-21-21-20-24-24-25-24-23
Percentage of EquityMethodInvestmentSummarizedFinancialInformationPropertyOperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value131312131414
Percentage of EquityMethodInvestmentSummarizedFinancialInformationPropertyOperatingExpense87.047.643.643.247.550.7

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:EquityMethodOfInvestmentSummarizedFinancialInformationOperatingIncomeLoss

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-03-312018-09-30
Value-1-1-1-1
Percentage of EquityMethodOfInvestmentSummarizedFinancialInformationOperatingIncomeLoss100.0100.0100.0100.0

us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

udr:IncomeFromParticipatingLoan

udr:DevelopmentCommunity



Period End2020-03-312019-03-31
Value53
Percentage of IncomeFromParticipatingLoan100.0100.0

udr:OperatingCommunity



Period End2020-03-312019-03-31
Value-2-3
Percentage of IncomeFromParticipatingLoan-41.9-98.8

us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:DevelopmentCommunity, udr:OtherInvestmentPortalsWashingtonDc



Period End2020-03-312019-09-302019-03-312018-09-30
Value1111
Percentage of IncomeFromParticipatingLoan23.00.029.80.0

udr:DevelopmentCommunity, udr:OtherInvestmentVentures



Period End2020-03-312019-09-302019-03-312018-09-30
Value0400
Percentage of IncomeFromParticipatingLoan-2.60.03.20.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1200BroadwayNashvilleTn



Period End2020-03-312019-09-302019-03-312018-09-30
Value1110
Percentage of IncomeFromParticipatingLoan22.10.029.70.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1300FairmountPhiladelphiaPa



Period End2020-03-312019-09-302019-03-312018-09-30
Value1000
Percentage of IncomeFromParticipatingLoan20.10.07.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1532HarrisonSanFranciscoCa



Period End2020-03-312019-09-302019-03-312018-09-30
Value836000.0802000.0748000.0721000.0
Percentage of IncomeFromParticipatingLoan14.40.019.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1641LincolnSantaMonicaCa



Period End2020-03-312019-09-302019-03-312018-09-30
Value314000.0299000.0275000.0141000.0
Percentage of IncomeFromParticipatingLoan5.40.07.00.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentEssexOrlandoFl



Period End2020-03-312019-09-302019-03-312018-09-30
Value466000.0443000.0332000.046000.0
Percentage of IncomeFromParticipatingLoan8.00.08.40.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentHillsboroOregon



Period End2020-03-312019-03-31
Value-46000.0-161000.0
Percentage of IncomeFromParticipatingLoan-0.8-4.1

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentModeraLakeMerrittOakland



Period End2020-03-312019-09-30
Value574000.0366000.0
Percentage of IncomeFromParticipatingLoan9.90.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentThousandOaksCa



Period End2020-03-31
Value24000.0
Percentage of IncomeFromParticipatingLoan0.4

udr:OperatingCommunity, udr:UnconsolidatedJointVentureOneUDRMetLifePartnership



Period End2020-03-312019-03-31
Value-454000.0-576000.0
Percentage of IncomeFromParticipatingLoan-7.8-14.6

udr:OperatingCommunity, udr:UnconsolidatedJointVentureOtherMetLife



Period End2020-03-312019-03-31
Value-1-1
Percentage of IncomeFromParticipatingLoan-31.2-45.1

udr:OperatingCommunity, udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership



Period End2020-03-312019-03-31
Value-91000.0434000.0
Percentage of IncomeFromParticipatingLoan-1.611.0

udr:OperatingCommunity, udr:UnconsolidatedJointVentureWestCoastDevelopmentJv



Period End2020-03-312019-03-31
Value-77000.0-149000.0
Percentage of IncomeFromParticipatingLoan-1.3-3.8

udr:IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value0102000000-3000-10-10-7-2-2-3-2-2-1-2-2-2200
Percentage of IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

udr:InterestAndOtherIncomeIncludingDiscontinuedOperations



Period End2020-03-312019-09-302019-03-312018-09-30
Value2191
Percentage of InterestAndOtherIncomeIncludingDiscontinuedOperations100.0100.0100.0100.0

dei:LegalEntity

udr:LongTermIncentivePlanOperatingPartnershipUnitGrantsValue

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value56510227101100000
Percentage of LongTermIncentivePlanOperatingPartnershipUnitGrantsValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:PartnerCapitalComponents, dei:LegalEntity

udr:PartnershipCapital, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value5651022
Percentage of LongTermIncentivePlanOperatingPartnershipUnitGrantsValue100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

udr:LimitedPartners, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value5651022
Percentage of LongTermIncentivePlanOperatingPartnershipUnitGrantsValue100.0100.0100.0100.0100.0100.0

udr:LongTermIncentivePlanOperatingPartnershipUnitsVestingShares



Period End2020-03-312019-03-312018-03-312017-03-31
Value772000.0416579.0285619.072226.0
Percentage of LongTermIncentivePlanOperatingPartnershipUnitsVestingShares100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-03-312018-03-31
Value772000.0416579.0285619.0
Percentage of LongTermIncentivePlanOperatingPartnershipUnitsVestingShares100.0100.0100.0

udr:LongTermIncentivePlanUnitGrantsVestingsNet



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-1665-322-1
Percentage of LongTermIncentivePlanUnitGrantsVestingsNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-1665-322-1
Percentage of LongTermIncentivePlanUnitGrantsVestingsNet100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:NonCashLongTermIncentivePlanOperatingPartnershipUnitGrantsValue

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-31
Value5107
Percentage of NonCashLongTermIncentivePlanOperatingPartnershipUnitGrantsValue100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:NumberOfApartmentHomesAcquired

udr:HomeOperatingCommunity294TampaFlorida



Period End2020-01-31
Value294.0
Percentage of NumberOfApartmentHomesAcquired100.0

udr:PreferredEquityInvestmentHillsboroOregon



Period End2020-01-31
Value276.0
Percentage of NumberOfApartmentHomesAcquired93.9

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

udr:PreferredEquityInvestmentHillsboroOregon, us-gaap:SubsequentEvent



Period End2020-01-31
Value276.0
Percentage of NumberOfApartmentHomesAcquired93.9

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

udr:NumberOfCommunitiesAcquired

udr:OperatingCommunityInSt.PetersburgFlorida, us-gaap:SubsequentEvent



Period End2020-01-31
Value294.0
Percentage of NumberOfCommunitiesAcquired100.0

dei:LegalEntity

udr:NumberOfCommunitiesEncumbered

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value2.01.05.09.00.0-4.0-1.016.0-4.00.0-1.021.00.00.00.021.023.0
Percentage of NumberOfCommunitiesEncumbered100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.00.00.00.0100.0100.0

us-gaap:DebtInstrument, dei:LegalEntity

udr:FixedRateDebt, udr:UnitedDominionRealityLP



Period End2020-03-31
Value1.0
Percentage of NumberOfCommunitiesEncumbered50.0

udr:VariableRateDebt, udr:UnitedDominionRealityLP



Period End2020-03-31
Value1.0
Percentage of NumberOfCommunitiesEncumbered50.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:LineOfCredit



Period End2020-03-312019-03-312018-03-312017-09-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-03-31
Value4.01.08.08.010.00.0-8.00.018.021.021.022.022.022.022.022.022.022.022.023.028.0
Percentage of NumberOfCommunitiesEncumbered200.0100.0160.00.0111.10.0200.0-0.0112.50.0-2100.0104.80.00.00.0104.80.00.00.0100.00.0

udr:FixedRateDebt, us-gaap:Mortgages



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-03-31
Value15.07.07.07.07.07.02.00.0-3.08.07.07.07.06.08.08.08.08.08.08.08.09.0
Percentage of NumberOfCommunitiesEncumbered750.0700.0140.00.00.077.80.0-0.0300.050.00.0-700.033.30.00.00.038.10.00.00.034.80.0

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-03-312018-03-312017-09-30
Value19.08.015.015.0
Percentage of NumberOfCommunitiesEncumbered950.0800.0300.00.0

udr:VariableRateDebt, udr:TaxExemptNotesPayable



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-03-312011-12-312011-09-30
Value1.02.02.02.02.02.00.00.00.02.02.02.02.02.02.02.02.02.02.02.02.02.00.00.0
Percentage of NumberOfCommunitiesEncumbered50.0200.040.00.00.022.20.0-0.0-0.012.50.0-200.09.50.00.00.09.50.00.00.08.70.00.00.0

udr:VariableRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-03-312018-03-312017-09-302017-06-30
Value1.02.03.03.03.0
Percentage of NumberOfCommunitiesEncumbered50.0200.060.00.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity

udr:FixedRateDebt, us-gaap:Mortgages, udr:UnitedDominionRealityLP



Period End2020-03-31
Value1.0
Percentage of NumberOfCommunitiesEncumbered50.0

udr:VariableRateDebt, udr:TaxExemptNotesPayable, udr:UnitedDominionRealityLP



Period End2020-03-31
Value1.0
Percentage of NumberOfCommunitiesEncumbered50.0

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value20.010.018.018.018.024.02.0-10.0-3.037.038.038.039.040.040.041.039.039.042.0
Percentage of NumberOfCommunitiesEncumbered1000.01000.0360.00.00.0266.70.0250.0300.0231.20.0-3800.0185.70.00.0195.20.00.0182.6

udr:OperatingLeaseLiabilitiesAmortization



Period End2020-03-312019-03-31
Value700000.0100000.0
Percentage of OperatingLeaseLiabilitiesAmortization100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-31
Value900000.0
Percentage of OperatingLeaseLiabilitiesAmortization128.6

us-gaap:StatementBusinessSegments

udr:OperatingLeaseOtherIncome

udr:NonMatureCommunitiesOther



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1320230
Percentage of OperatingLeaseOtherIncome100.0100.0100.0100.0100.0100.0100.0

udr:SameCommunitiesMidAtlanticRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1442431
Percentage of OperatingLeaseOtherIncome98.1137.9155.6281.7144.3122.3261.1

udr:SameCommunitiesNortheastRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0110110
Percentage of OperatingLeaseOtherIncome31.241.648.088.643.935.787.4

udr:SameCommunitiesSoutheasternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1331331
Percentage of OperatingLeaseOtherIncome89.1108.4127.4251.5114.9103.4255.2

udr:SameCommunitiesSouthwesternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0110110
Percentage of OperatingLeaseOtherIncome36.848.155.8103.154.646.785.6

udr:SameCommunitiesWesternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value2773772
Percentage of OperatingLeaseOtherIncome172.9248.0289.8443.6256.5228.3411.7

udr:TotalCommunities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value82121919207
Percentage of OperatingLeaseOtherIncome528.1684.0776.51268.5714.0636.41200.9

us-gaap:StatementBusinessSegments, dei:LegalEntity

udr:NonMatureCommunitiesOther, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value137000.078000.0-24000.0156000.0141000.0115000.0
Percentage of OperatingLeaseOtherIncome8.52.5-0.921.95.03.6

udr:SameCommunitiesMidAtlanticRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value431000.0551000.0429000.0535000.0441000.0423000.0
Percentage of OperatingLeaseOtherIncome26.917.415.775.215.813.1

udr:SameCommunitiesNortheastRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value101000.0187000.0168000.0166000.0178000.0152000.0
Percentage of OperatingLeaseOtherIncome6.35.96.223.36.44.7

udr:SameCommunitiesSoutheasternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value644000.0799000.0727000.0775000.0658000.0691000.0
Percentage of OperatingLeaseOtherIncome40.125.226.7109.023.521.4

udr:SameCommunitiesSouthwesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value71000.087000.091000.031000.058000.090000.0
Percentage of OperatingLeaseOtherIncome4.42.73.34.42.12.8

udr:SameCommunitiesWesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value121111
Percentage of OperatingLeaseOtherIncome110.965.067.9280.662.659.1

udr:TotalCommunities, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value333333
Percentage of OperatingLeaseOtherIncome197.2118.7119.0514.5115.4104.7

udr:OperatingLeaseRightOfUseAssetAmortization



Period End2020-03-312019-03-31
Value800000.0200000.0
Percentage of OperatingLeaseRightOfUseAssetAmortization100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-31
Value900000.0
Percentage of OperatingLeaseRightOfUseAssetAmortization112.5

udr:OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-2-1-4-2101151001-46-6-711110
Percentage of OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-2-1-4-2101151001-46-6-711110
Percentage of OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:OtherCostAndExpenseOperatingIncludingDiscontinuedOperations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value4225322121211132112221111111111
Percentage of OtherCostAndExpenseOperatingIncludingDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value322222112111111111011111114411
Percentage of OtherCostAndExpenseOperatingIncludingDiscontinuedOperations77.783.688.642.570.877.877.480.689.891.564.692.280.385.641.256.284.684.437.273.866.874.278.778.784.490.0285.6292.890.891.3

udr:OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value14121212111211121113131110131715131211111211119910139111210
Percentage of OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value544444444544356775767665544456
Percentage of OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations35.433.333.637.434.836.736.633.238.639.937.139.235.539.235.650.151.246.461.260.159.558.160.359.758.846.232.852.545.548.9

us-gaap:PropertyPlantAndEquipmentByType

udr:PercentageOfRevenueTotalLeaseRevenue

udr:ApartmentHomes



Period End2020-03-31
Value0.984
Percentage of PercentageOfRevenueTotalLeaseRevenue100.0

us-gaap:AssetsLeasedToOthers



Period End2020-03-31
Value0.016
Percentage of PercentageOfRevenueTotalLeaseRevenue1.6

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:ApartmentHomes, udr:UnitedDominionRealityLP



Period End2020-03-31
Value0.984
Percentage of PercentageOfRevenueTotalLeaseRevenue100.0

udr:PropertyManagementCostsOperating



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value98877766
Percentage of PropertyManagementCostsOperating100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value33323222
Percentage of PropertyManagementCostsOperating35.038.641.338.741.641.842.642.4

udr:RelatedPartyTransactionManagementFees



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value44443333433344443333333222
Percentage of RelatedPartyTransactionManagementFees100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Ownership

udr:RentalRevenuesPercentOfParentRentalRevenue

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-06-302017-06-30
Value0.350.40.420.43
Percentage of RentalRevenuesPercentOfParentRentalRevenue100.0100.0100.0100.0

udr:ReturnOnInvestmentInEquityMethodInvestments



Period End2020-03-312019-03-31
Value11
Percentage of ReturnOnInvestmentInEquityMethodInvestments100.0100.0

udr:SameStoreCommunities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value37910.038177.038177.037959.038307.038911.038277.036540.035689.032472.034179.034017.034774.035250.036063.036268.0
Percentage of SameStoreCommunities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value15941.015941.015941.015723.016216.016216.016216.015058.015058.014001.014277.014277.019024.018969.019209.019518.0
Percentage of SameStoreCommunities42.041.841.841.442.341.742.441.242.243.141.842.054.753.853.353.8

us-gaap:StatementBusinessSegments

udr:SegmentReportingInformationNetOperatingIncome

udr:NonMatureCommunitiesOther



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value50292420149919182042383131532525213521241917191923394250362331371810
Percentage of SegmentReportingInformationNetOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:SameCommunitiesMidAtlanticRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value403940393841393940362524292826263029282728282829283427262726252525
Percentage of SegmentReportingInformationNetOperatingIncome79.2135.1161.6195.1271.2418.2439.1207.1222.4181.358.964.492.190.049.3104.6118.4136.880.2128.3115.6143.9166.7147.6146.9150.168.262.773.9114.279.1140.3251.3

udr:SameCommunitiesNortheastRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value20202120252626262726232323221616161511151510101010999
Percentage of SegmentReportingInformationNetOperatingIncome40.469.786.7104.4184.0270.3293.1136.9150.5134.354.160.874.473.631.062.663.672.732.872.363.053.961.954.451.443.024.521.9

udr:SameCommunitiesSoutheasternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value222222222121212020191918191817171718181717201818181717172020161919
Percentage of SegmentReportingInformationNetOperatingIncome44.475.189.4109.6153.2215.0232.1108.7111.298.145.849.260.060.333.768.069.986.651.881.273.2100.7108.295.695.576.344.741.355.585.751.2106.4188.4

udr:SameCommunitiesSouthwesternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value111010877666647889888888876666579468
Percentage of SegmentReportingInformationNetOperatingIncome21.735.442.144.854.278.171.233.736.733.39.618.825.726.417.434.735.239.924.539.533.641.946.435.435.228.415.713.120.139.915.238.283.6

udr:SameCommunitiesWesternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value798180787776736262615657555442585150424945444543413938353538333236
Percentage of SegmentReportingInformationNetOperatingIncome156.6275.3326.2390.5548.6780.7812.2330.2347.4309.0131.8150.8173.8176.380.6225.0200.9234.6120.5228.2186.3222.7264.9220.8211.0171.696.083.996.9161.8104.2179.1352.5

udr:TotalCommunities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value225203199189184183176174174171170167
Percentage of SegmentReportingInformationNetOperatingIncome442.3690.6806.1944.41311.21862.41947.7916.6968.2856.0444.0526.1

us-gaap:StatementBusinessSegments, dei:LegalEntity

udr:NonMatureCommunitiesOther, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value444455
Percentage of SegmentReportingInformationNetOperatingIncome8.714.218.920.040.458.4

udr:SameCommunitiesMidAtlanticRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value101010101010
Percentage of SegmentReportingInformationNetOperatingIncome21.236.042.652.472.2105.5

udr:SameCommunitiesNortheastRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value556666
Percentage of SegmentReportingInformationNetOperatingIncome11.619.525.330.942.661.4

udr:SameCommunitiesSoutheasternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value999998
Percentage of SegmentReportingInformationNetOperatingIncome18.731.837.846.166.289.9

udr:SameCommunitiesSouthwesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value111111
Percentage of SegmentReportingInformationNetOperatingIncome2.74.86.06.78.914.5

udr:SameCommunitiesWesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value494949474747
Percentage of SegmentReportingInformationNetOperatingIncome97.1168.0199.2238.0338.4478.4

udr:TotalCommunities, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value818081798079
Percentage of SegmentReportingInformationNetOperatingIncome160.0274.1329.6394.0568.6808.2

udr:SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value15512711711210710610810710810510210510510510490908891898888858388849498969184817573
Percentage of SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-03-312013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value35353434353637373936363637364445455146515150
Percentage of SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization22.727.629.630.832.534.134.734.636.235.135.434.935.034.950.253.254.457.855.354.853.855.1

udr:SegmentReportingReconcilingItemsOwnedPropertyManagementCosts



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value98877766666-6-666-5-5555555554555544444
Percentage of SegmentReportingReconcilingItemsOwnedPropertyManagementCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value333232222222222333222222222222
Percentage of SegmentReportingReconcilingItemsOwnedPropertyManagementCosts35.038.641.338.741.641.842.642.442.542.542.5-42.7-42.742.643.5-52.9-53.253.252.452.852.152.754.654.454.355.153.252.452.454.3

us-gaap:AllocatedShareBasedCompensationExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value644433333333345433322104222233
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongtermDebtType

us-gaap:AmortizationOfDebtDiscountPremium

udr:DebtAssumedAsPartOfAcquisition



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value2000000000000011111111111111
Percentage of AmortizationOfDebtDiscountPremium100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCosts



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value11111111111111211122212311222
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

udr:StockCompensationPlanAndUnvestedRestrictedStock



Period End2020-03-312019-03-31
Value703000.0555000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0

us-gaap:ConvertiblePreferredStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value333333333333333333333333333333
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount428.30.00.0542.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:EquityUnitPurchaseAgreements



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value222222242424242424242525259999999999998
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount3161.90.00.04374.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

us-gaap:BusinessCombinationConsiderationTransferredLiabilitiesIncurred

udr:PreferredEquityInvestmentHillsboroOregon, us-gaap:SubsequentEvent



Period End2020-01-31
Value35
Percentage of BusinessCombinationConsiderationTransferredLiabilitiesIncurred100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value251039341121216-9419
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value3314-2024-3022
Percentage of CapitalExpendituresIncurredButNotYetPaid13.234.24.814.0-132.121.611.621.2-47.4-10.253.315.4

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect



Period End2020-03-312019-03-312018-03-31
Value-10-1840
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-31
Value139000.0381000.0213000.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect-1.3-0.2-21.8

us-gaap:CommonStockDividendsPerShareDeclared



Period End2020-03-312019-09-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value0.360.34250.34250.32250.32250.32250.310.310.310.294999999999999930.2950.30.30.27750000000000010.27750.27750.27750.260.260.260.260.2350.2350.2350.220.220.220.215000000000000080.20.20.1850.184999999999999940.1850.180.180.184999999999999940.180.305
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConversionOfStockSharesConverted1



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-03-31
Value0100-16316120-1129102000000000
Percentage of ConversionOfStockSharesConverted1100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod



Period End2020-03-312019-10-302019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-03-312011-12-312011-09-30
Value0.03280.04630.03730.03660.03650.03670.03670.0013000000000000025-0.0010000000000000009-0.0018999999999999990.03950.03910.03580.03620.03940.03980.0390.03950.04310.04340.0420.04340.0413-0.00129999999999999569.999999999999593e-05
Percentage of DebtInstrumentInterestRateDuringPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value0.02830.0250.0480.04260.00039999999999999760.00039999999999999760.00040000000000000450.0382-0.00680000000000000050.000100000000000002860.00050000000000000040.0438-0.000899999999999998-0.000100000000000002860.000100000000000002860.04470.0451
Percentage of DebtInstrumentInterestRateDuringPeriod86.367.0131.1116.130.8-40.0-21.196.70.00.31.4121.0-2.3-0.30.3113.2103.9

us-gaap:DebtInstrument, dei:LegalEntity

udr:FixedRateDebt, udr:UnitedDominionRealityLP



Period End2020-03-31
Value0.031
Percentage of DebtInstrumentInterestRateDuringPeriod94.5

udr:VariableRateDebt, udr:UnitedDominionRealityLP



Period End2020-03-31
Value0.0191
Percentage of DebtInstrumentInterestRateDuringPeriod58.2

us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass

udr:FixedRateDebt, us-gaap:LineOfCredit



Period End2020-03-31
Value0.049
Percentage of DebtInstrumentInterestRateDuringPeriod149.4

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:LineOfCredit



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312012-03-31
Value0.0490.03950.04860.04860.04860.05060.0514
Percentage of DebtInstrumentInterestRateDuringPeriod149.4105.9132.8133.2132.4137.9124.5

udr:FixedRateDebt, us-gaap:Mortgages



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-03-31
Value0.03610.03820.04040.04040.04040.0404-0.0025999999999999980.0-0.0027000000000000010.04570.05510.0550.05490.05460.05470.05460.05450.05440.05430.05420.05410.0506
Percentage of DebtInstrumentInterestRateDuringPeriod110.1102.4110.4110.7110.1110.1-200.0-0.0142.1115.7140.9153.6151.7138.6137.4140.0138.0126.2125.1129.0124.7122.5

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-03-312018-03-312017-09-30
Value0.03850.03850.04390.0439
Percentage of DebtInstrumentInterestRateDuringPeriod117.4103.2119.9120.3

udr:VariableRateDebt, udr:TaxExemptNotesPayable



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-03-312011-12-312011-09-30
Value0.01910.02310.0190.01590.01540.0142-0.00060000000000000160.0027000000000000010.0029999999999999990.00880.00750.00840.00760.00830.00770.00860.00790.00840.00870.00890.00870.0088-0.00059999999999999980.0
Percentage of DebtInstrumentInterestRateDuringPeriod58.261.951.943.642.038.7-46.2-270.0-157.922.319.223.521.021.119.322.120.019.520.021.220.021.346.20.0

udr:VariableRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-03-312018-03-312017-09-302017-06-30
Value0.01910.02310.02210.01870.0179
Percentage of DebtInstrumentInterestRateDuringPeriod58.261.960.451.248.8

us-gaap:CommercialPaper, udr:UnsecuredRevolvingCreditFacilityDueTwoThousandTwenty



Period End2020-03-31
Value0.0158
Percentage of DebtInstrumentInterestRateDuringPeriod48.2

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity

udr:FixedRateDebt, us-gaap:Mortgages, udr:UnitedDominionRealityLP



Period End2020-03-31
Value0.031
Percentage of DebtInstrumentInterestRateDuringPeriod94.5

udr:VariableRateDebt, udr:TaxExemptNotesPayable, udr:UnitedDominionRealityLP



Period End2020-03-31
Value0.0191
Percentage of DebtInstrumentInterestRateDuringPeriod58.2

us-gaap:LongtermDebtType

udr:A2.95MediumTermNoteDueSeptember2026



Period End2020-03-31
Value0.0295
Percentage of DebtInstrumentInterestRateDuringPeriod89.9

udr:A3.75MTNDueJuly2024



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value0.03750.03750.03750.03750.03750.03750.00.00.00.03750.03750.03750.03750.03750.03750.0375
Percentage of DebtInstrumentInterestRateDuringPeriod114.3100.5102.5102.7102.2102.20.0-0.0-0.094.995.9104.7103.695.294.296.2

udr:A4.00MediumTermNoteDueOctober2025



Period End2020-03-31
Value0.04
Percentage of DebtInstrumentInterestRateDuringPeriod122.0

udr:EightPointFiveZeroPercentDebenturesDueSeptember2024



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.0850.0850.0850.0850.0850.0850.00.00.00.0850.0850.0850.0850.0850.0850.0850.0850.0850.0850.0850.085
Percentage of DebtInstrumentInterestRateDuringPeriod259.1227.9232.2232.9231.6231.60.0-0.0-0.0215.2217.4237.4234.8215.7213.6217.9215.2197.2195.9202.4195.9

udr:MediumTerm3.00PercentageNoteDueAugust2031



Period End2020-03-31
Value0.03
Percentage of DebtInstrumentInterestRateDuringPeriod91.5

udr:MediumTerm3.10PercentageNoteDueNovember2034



Period End2020-03-31
Value0.031
Percentage of DebtInstrumentInterestRateDuringPeriod94.5

udr:SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030



Period End2020-03-31
Value0.032
Percentage of DebtInstrumentInterestRateDuringPeriod97.6

udr:TermLoanFacilityDueSeptember2023



Period End2020-03-312019-03-31
Value0.02480.0339
Percentage of DebtInstrumentInterestRateDuringPeriod75.690.9

udr:UnsecuredRevolvingCreditFacilityDueTwoThousandTwentyThree



Period End2020-03-31
Value0.0175
Percentage of DebtInstrumentInterestRateDuringPeriod53.4

udr:UnsecuredWorkingCapitalCreditFacilityDueJanuary2021



Period End2020-03-312019-03-312018-03-31
Value0.01820.03320.0278
Percentage of DebtInstrumentInterestRateDuringPeriod55.589.076.0

us-gaap:SecuredDebt



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.0380.0360.04050.040.03990.038-0.0001999999999999988-0.0013999999999999985-0.00100000000000000090.03920.04210.04220.04180.04160.04270.04280.04230.04240.04330.04340.0437
Percentage of DebtInstrumentInterestRateDuringPeriod115.996.5110.7109.6108.7103.5-15.4140.052.699.2107.7117.9115.5105.6107.3109.7107.198.499.8103.3100.7

us-gaap:UnsecuredDebt



Period End2020-03-312019-03-312018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.03290.03650.03470.03450.03490.03520.0020999999999999977-0.0005999999999999964-0.00210000000000000460.03790.03720.0320.03260.03810.0380.03680.03770.04350.04350.0410.0431
Percentage of DebtInstrumentInterestRateDuringPeriod100.397.994.894.595.195.9161.560.0110.595.995.189.490.196.795.594.495.4100.9100.297.699.3

us-gaap:Range, us-gaap:LongtermDebtType

srt:WeightedAverage, udr:MediumTermNotesDueAugust2031



Period End2020-03-31
Value0.0301
Percentage of DebtInstrumentInterestRateDuringPeriod91.8

srt:WeightedAverage, udr:ThreePointOneZeroPercentSeniorUnsecuredNotesDue2034



Period End2020-03-31
Value0.0313
Percentage of DebtInstrumentInterestRateDuringPeriod95.4

us-gaap:DepreciationAndAmortization



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value211111111111111111211111111000011111101
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationNonproduction



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value155127117112107106108107108105102105105105104909088
Percentage of DepreciationNonproduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value353534343536373739363636373637434444
Percentage of DepreciationNonproduction22.727.629.630.832.534.134.734.636.235.135.434.935.034.935.648.448.850.1

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:InterestRateContract, us-gaap:CashFlowHedging, us-gaap:InterestExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-357000.0624000.0933000.0945000.0564000.0426000.0172000.0-119000.0-308000.0
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:IncomeStatementLocation

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:InterestRateContract, udr:OtherIncomeExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.00.00.00.00.00.0100000.0100000.00.0100000.0100000.0100000.0-1000.00.00.0-4000.00.00.00.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet0.00.00.00.00.00.0100.0100.00.0100.0100.0100.0100.00.00.0100.00.00.00.0

us-gaap:DirectCostsOfLeasedAndRentedPropertyOrEquipment



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value49464241444140424039404138394139373736393636373635363534
Percentage of DirectCostsOfLeasedAndRentedPropertyOrEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value16171616171616171616161715161620191918191818191918191818
Percentage of DirectCostsOfLeasedAndRentedPropertyOrEquipment34.038.138.739.439.539.840.940.640.241.741.241.041.140.740.851.751.351.351.050.949.849.753.552.252.452.953.054.1

us-gaap:DividendsCommonStockCash



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-12-312010-09-30
Value106100969686868682787878787272216-726666656558503934218-33
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-06-302011-03-312010-12-312010-09-30
Value10610096968686868278787878-72-72-71-726666656558503934218-33
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-100.0-100.0-33.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsPreferredStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value111100000000000000000
Percentage of DividendsPreferredStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss

udr:UnconsolidatedJointVentures



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0124161-6-7-5-5-5-415-3-30-1181-4-6-324233-338-8-435-17-35
Percentage of EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-3-3-3-3-3-4
Percentage of EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss575.9-2.7-19.2-274.755.154.7

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationRevenue

udr:UnconsolidatedJointVentures



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value4175768176706763615860585555555463616262626167746355514846281110
Percentage of EquityMethodInvestmentSummarizedFinancialInformationRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value323232313534
Percentage of EquityMethodInvestmentSummarizedFinancialInformationRevenue79.143.041.638.846.049.0

us-gaap:ExtinguishmentOfDebtAmount



Period End2020-04-30
Value215
Percentage of ExtinguishmentOfDebtAmount100.0

us-gaap:LineOfCreditFacility

udr:UdrBankCreditFacility



Period End2020-03-31
Value215
Percentage of ExtinguishmentOfDebtAmount0.0

dei:LegalEntity

us-gaap:IncomeLossAttributableToNoncontrollingInterest

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-09-302011-06-302010-09-302010-06-30
Value0000000000200020000000
Percentage of IncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:IncomeLossAttributableToParent

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value2426272327249120101311114144736
Percentage of IncomeLossAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value529382620221817112659291284131076
Percentage of IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value31260-1-2-11-11135150012059-200-3-30-20-2-2-2-1-1-1-10-100-160
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-1-2-1-2-2-2-5-4-4-5-4-9-10-13-4000
Percentage of IncomeLossFromEquityMethodInvestments-52.3-18.7-27.1-5591.8172.1133.2299.2-262.9305.0-48.4-12.6-61.9-3086.2-1971.6-442.90.0-0.00.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:UnconsolidatedJointVentures



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value92119211613141313132213202210-111601
Percentage of IncomeLossFromEquityMethodInvestments290.3171.8296.144163.3-1198.4-684.4-845.1746.8-950.5124.0149.14123.7-100.0100.0-100.0-100.0-507.3100.0-100.0-100.0-481.1100.0-100.0

dei:LegalEntity

us-gaap:IncomeLossIncludingPortionAttributableToNoncontrollingInterest

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312011-09-30
Value2427272428259114501111-511514473632824307-6
Percentage of IncomeLossIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerCapitalComponents, dei:LegalEntity

udr:PartnershipCapital, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value242627232724
Percentage of IncomeLossIncludingPortionAttributableToNoncontrollingInterest97.998.498.598.498.498.3

us-gaap:NoncontrollingInterest, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value522000.0448000.0416000.0388000.0440000.0420000.0
Percentage of IncomeLossIncludingPortionAttributableToNoncontrollingInterest2.11.61.51.61.61.7

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

udr:ClassLimitedPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value229000.0255000.0260000.0228000.0264000.0236000.0
Percentage of IncomeLossIncludingPortionAttributableToNoncontrollingInterest0.90.90.90.90.90.9

udr:LimitedPartners, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value000011
Percentage of IncomeLossIncludingPortionAttributableToNoncontrollingInterest3.63.33.33.34.14.1

us-gaap:GeneralPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value14000.016000.017000.014000.017000.015000.0
Percentage of IncomeLossIncludingPortionAttributableToNoncontrollingInterest0.10.10.10.10.10.1

us-gaap:LimitedPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value222526222623
Percentage of IncomeLossIncludingPortionAttributableToNoncontrollingInterest93.394.194.294.193.393.2

us-gaap:IncreaseDecreaseInOperatingAssets



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value0-2-3-32261-617-2-4-4112-83-3101954-5130-231
Percentage of IncreaseDecreaseInOperatingAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value0-2-2-110-23-2100040-17023
Percentage of IncreaseDecreaseInOperatingAssets-438.6110.258.751.367.618.3-33.2201.942.210.5-25.97.116.335.00.117.9232.0-26.911.724.5

us-gaap:IncreaseDecreaseInOperatingLiabilities



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value-31-17-7-14-1314-6-66-18-23307-17-19-15-1283-12-7154-16-1013
Percentage of IncreaseDecreaseInOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value3334-85-58-117-10-741-4-30313
Percentage of IncreaseDecreaseInOperatingLiabilities-10.5-17.2-46.2-28.460.038.089.0-129.7-183.3-531.0-12.5-0.4-188.4676.425.422.915.6-0.942.189.3

us-gaap:IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value000000000000000-1-1-10-1-1
Percentage of IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value000011121102113241021111000-12-1-1-12-1-1
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestCostsIncurredCapitalized



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value11111344444434333445456887543332223
Percentage of InterestCostsIncurredCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:InterestExpenseRelatedParty

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value66773333333333111111-110000000000
Percentage of InterestExpenseRelatedParty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestIncomeRelatedParty



Period End2020-03-312019-03-312018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-03-312012-09-30
Value0.00.00.00.00.00.00.00.0-184000.02000.0182000.00.0184000.00.095000.0
Percentage of InterestIncomeRelatedParty0.00.00.00.00.00.00.00.0100.0100.0100.00.0100.00.0100.0

us-gaap:InterestPaidNet



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value57443532283132312835264026353138413140444042394140384141
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value10537655591111111111101012111712
Percentage of InterestPaidNet18.611.49.621.820.918.117.617.334.633.245.228.544.531.035.128.128.937.538.131.3

dei:LegalEntity

us-gaap:LeaseCost

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-31
Value32
Percentage of LeaseCost100.0100.0

us-gaap:IncomeStatementLocation, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OtherOperatingIncomeExpense, us-gaap:Land



Period End2020-03-312019-09-302019-06-302019-03-31
Value3222
Percentage of LeaseCost98.90.00.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-31
Value36000.0
Percentage of LeaseCost1.1

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-31
Value3222
Percentage of LeaseCost98.90.00.0100.0

us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityAverageOutstandingAmount

udr:UdrBankCreditFacility, us-gaap:RevolvingCreditFacility



Period End2020-03-31
Value11
Percentage of LineOfCreditFacilityAverageOutstandingAmount100.0

us-gaap:LongtermDebtType

udr:UnsecuredWorkingCapitalCreditFacilityDueJanuary2021



Period End2020-03-312019-03-312018-03-31
Value252230
Percentage of LineOfCreditFacilityAverageOutstandingAmount218.50.00.0

us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityInterestRateDuringPeriod

udr:UdrBankCreditFacility, us-gaap:RevolvingCreditFacility



Period End2020-03-31
Value0.018
Percentage of LineOfCreditFacilityInterestRateDuringPeriod100.0

us-gaap:LongtermDebtType

udr:UnsecuredWorkingCapitalCreditFacilityDueJanuary2021



Period End2020-03-312019-03-312018-03-31
Value0.0220.0330.026
Percentage of LineOfCreditFacilityInterestRateDuringPeriod122.20.00.0

us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod

udr:UdrBankCreditFacility, us-gaap:RevolvingCreditFacility



Period End2020-03-31
Value50
Percentage of LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod100.0

us-gaap:LongtermDebtType

udr:UnsecuredWorkingCapitalCreditFacilityDueJanuary2021



Period End2020-03-312019-03-312018-03-31
Value466661
Percentage of LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod92.80.00.0

us-gaap:MinorityInterestChangeInRedemptionValue



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value205-857-144-77-5368031834-31-67-2418-29-3311-27-24-614023-2-6-14-13
Percentage of MinorityInterestChangeInRedemptionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value205-857-144-77-5368031834-31-67-2418-29-3311-27-24-6-14023-2-6-14-13
Percentage of MinorityInterestChangeInRedemptionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossAttributableToNonredeemableNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value10000.0-40000.0-27000.0-30000.0-21000.0-16000.0-70000.0-100000.0101000.012000.0-100000.0-100000.0306000.0-3000.0-1000.00.07000.0-5000.0-4000.02000.04000.0-37000.03000.04000.042000.043000.052000.046000.0
Percentage of NetIncomeLossAttributableToNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-31
Value10000.0-40000.0-27000.0-30000.0-21000.0-16000.0-70000.0101000.012000.09000.0-5000.0306000.0-3000.0-1000.00.07000.0-5000.0-4000.02000.04000.04000.0
Percentage of NetIncomeLossAttributableToNonredeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0-9.05.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:NetIncomeLossAttributableToRedeemableNoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value022211710222210100322110000053100000-1
Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAndDiluted

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value0.130.130.150.150.130.470.150.130.50.330.110.060.070.270.060.060.030.620.080.260.20.180.050.130.170.240.060.060.040.00.00.28-0.040.17-0.040.04-0.01-0.04-0.01
Percentage of NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302012-09-30
Value6000.056000.047000.042000.032000.030000.079000.0-35000.051000.091000.015000.0-51000.0-8000.0306000.0-3000.01000.00.07000.0-5000.0-4000.02000.04000.0-37000.03000.042000.0
Percentage of NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value522000.0448000.0416000.0388000.0440000.0420000.0418000.0374000.0343000.0350000.0382000.0368000.0350000.0344000.0687000.0335000.0347000.0394000.0255000.0238000.0178000.0280000.039000.066000.0280000.039000.0
Percentage of NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsNonredeemable8700.0800.0885.1923.81375.01400.0529.1-1068.6672.5384.62546.7-721.6-4375.0112.4-22900.033500.00.05628.6-5100.0-5950.08900.07000.0-105.42200.00.092.9

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OperatingLeaseCost

us-gaap:Land



Period End2020-03-312019-09-302019-06-302019-03-31
Value3122
Percentage of OperatingLeaseCost100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-31
Value3122
Percentage of OperatingLeaseCost100.0100.0100.0100.0

us-gaap:OperatingLeaseLeaseIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value320302289278267264263256250
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value112111111110108108109107106
Percentage of OperatingLeaseLeaseIncome35.036.838.639.640.441.041.641.842.6

us-gaap:StatementBusinessSegments

udr:NonMatureCommunitiesOther



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value76443630272222
Percentage of OperatingLeaseLeaseIncome23.815.313.011.510.39.08.8

udr:SameCommunitiesMidAtlanticRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value57575656555554
Percentage of OperatingLeaseLeaseIncome18.019.820.321.021.021.521.7

udr:SameCommunitiesNortheastRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value31313130303030
Percentage of OperatingLeaseLeaseIncome9.810.911.211.511.711.812.0

udr:SameCommunitiesSoutheasternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value32313131303030
Percentage of OperatingLeaseLeaseIncome10.011.111.411.711.811.912.0

udr:SameCommunitiesSouthwesternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value17161614161614
Percentage of OperatingLeaseLeaseIncome5.45.96.15.66.36.55.7

udr:SameCommunitiesWesternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value10510710510310210199
Percentage of OperatingLeaseLeaseIncome32.937.138.038.739.039.539.7

udr:TotalCommunities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value320289278267263256250
Percentage of OperatingLeaseLeaseIncome100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments, dei:LegalEntity

udr:NonMatureCommunitiesOther, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value777687
Percentage of OperatingLeaseLeaseIncome2.42.62.62.63.43.1

udr:SameCommunitiesMidAtlanticRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value151515151515
Percentage of OperatingLeaseLeaseIncome4.95.35.55.75.75.9

udr:SameCommunitiesNortheastRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value888887
Percentage of OperatingLeaseLeaseIncome2.62.92.93.03.13.1

udr:SameCommunitiesSoutheasternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value131313131312
Percentage of OperatingLeaseLeaseIncome4.34.74.84.95.05.0

udr:SameCommunitiesSouthwesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value112112
Percentage of OperatingLeaseLeaseIncome0.60.70.70.70.70.8

udr:SameCommunitiesWesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value656464626261
Percentage of OperatingLeaseLeaseIncome20.322.423.023.423.723.9

udr:TotalCommunities, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value112111110108109107
Percentage of OperatingLeaseLeaseIncome35.038.639.640.441.641.8

us-gaap:StatementBusinessSegments

us-gaap:OperatingLeaseLeaseIncomeLeasePayments

udr:NonMatureCommunitiesOther



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value74403330241921
Percentage of OperatingLeaseLeaseIncomeLeasePayments100.0100.0100.0100.0100.0100.0100.0

udr:SameCommunitiesMidAtlanticRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value56525254515152
Percentage of OperatingLeaseLeaseIncomeLeasePayments75.1128.9156.3180.0211.6258.8246.3

udr:SameCommunitiesNortheastRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value30302930292929
Percentage of OperatingLeaseLeaseIncomeLeasePayments41.473.788.8100.1121.7147.6138.3

udr:SameCommunitiesSoutheasternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value30282829272728
Percentage of OperatingLeaseLeaseIncomeLeasePayments41.169.784.297.9114.6137.3132.5

udr:SameCommunitiesSouthwesternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value16151514151513
Percentage of OperatingLeaseLeaseIncomeLeasePayments22.337.746.146.962.176.264.6

udr:SameCommunitiesWesternRegion



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1029997100959396
Percentage of OperatingLeaseLeaseIncomeLeasePayments137.4242.4292.3333.4393.8475.4451.9

udr:TotalCommunities



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value311267257258243236242
Percentage of OperatingLeaseLeaseIncomeLeasePayments417.3652.4767.7858.41003.81195.21133.5

us-gaap:StatementBusinessSegments, dei:LegalEntity

udr:NonMatureCommunitiesOther, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value777687
Percentage of OperatingLeaseLeaseIncomeLeasePayments10.118.221.922.335.939.8

udr:SameCommunitiesMidAtlanticRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value151414141414
Percentage of OperatingLeaseLeaseIncomeLeasePayments20.336.444.449.160.474.1

udr:SameCommunitiesNortheastRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value887777
Percentage of OperatingLeaseLeaseIncomeLeasePayments11.019.823.826.432.739.3

udr:SameCommunitiesSoutheasternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value121212121212
Percentage of OperatingLeaseLeaseIncomeLeasePayments17.431.337.941.352.061.8

udr:SameCommunitiesSouthwesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value111111
Percentage of OperatingLeaseLeaseIncomeLeasePayments2.54.65.86.47.79.9

udr:SameCommunitiesWesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value636262606059
Percentage of OperatingLeaseLeaseIncomeLeasePayments84.7153.2185.9201.5249.9301.2

udr:TotalCommunities, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value109107107104106103
Percentage of OperatingLeaseLeaseIncomeLeasePayments146.0263.4319.6347.0438.6526.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-20-4-2201
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:IncomeStatementLocation

us-gaap:InterestRateContract, us-gaap:CashFlowHedging, us-gaap:InterestExpense



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-20-4-2201
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-357000.0624000.0933000.0945000.0564000.0426000.0172000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value-2-1-5-310100162-101-56-6-8111111000-5
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-03-312018-03-312011-03-31
Value-138000.0-252000.0133000.017000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0

udr:NoncontrollingInterestType

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-03-312018-09-30
Value-100000.0-100000.0-300000.0200000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest72.50.0119.00.0

us-gaap:OtherCostAndExpenseOperating



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value422532212121113211222111111111111111112
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value32222211211111111101111111441111
Percentage of OtherCostAndExpenseOperating77.783.688.642.570.877.877.480.689.891.564.692.280.385.641.256.284.684.436.873.967.174.678.778.784.490.0285.6292.890.893.784.579.6

us-gaap:OtherDepreciationAndAmortization



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value211111111111111111
Percentage of OtherDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherInterestAndDividendIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value21111100000000000000113111000
Percentage of OtherInterestAndDividendIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-1314-151952-11466666645
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value011100001000100001
Percentage of OtherOperatingActivitiesCashFlowStatement-72.434.962.535.0-3.30.59.827.4-13.3-11.5-3.5-1.726.94.5-2.40.511.027.3

dei:LegalEntity

us-gaap:PartnersCapitalAccountDistributions

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312011-09-30
Value666363635959595754545454356-50-50-504747474743-37
Percentage of PartnersCapitalAccountDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PartnerCapitalComponents, dei:LegalEntity

udr:PartnershipCapital, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value666363635959
Percentage of PartnersCapitalAccountDistributions100.0100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

udr:ClassLimitedPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value631000.0599000.0599000.0599000.0582000.0582000.0
Percentage of PartnersCapitalAccountDistributions0.90.90.90.91.01.0

udr:LimitedPartners, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value222222
Percentage of PartnersCapitalAccountDistributions3.93.83.34.04.54.5

us-gaap:GeneralPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value40000.038000.038000.038000.036000.036000.0
Percentage of PartnersCapitalAccountDistributions0.10.10.10.10.10.1

us-gaap:LimitedPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value636060605656
Percentage of PartnersCapitalAccountDistributions95.195.295.694.994.494.5

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

us-gaap:PartnersCapitalAccountRedemptions

udr:ClassLimitedPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value17-60-10-5-3
Percentage of PartnersCapitalAccountRedemptions100.0100.0100.0100.0100.0100.0

udr:LimitedPartners, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value37-167-44-20-13
Percentage of PartnersCapitalAccountRedemptions215.8254.31090.6421.8384.2360.6

us-gaap:LimitedPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-5423-7552617
Percentage of PartnersCapitalAccountRedemptions-315.8-354.3-1190.6-521.8-484.2-460.6

us-gaap:PaymentsForCapitalImprovements



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-03-312010-12-312010-09-30
Value3231142132102424333227201424273022252330152116
Percentage of PaymentsForCapitalImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312011-09-302010-09-30
Value10147122019191016181591411129171130171815
Percentage of PaymentsForCapitalImprovements33.245.650.155.462.4186.780.143.151.058.158.247.8102.645.544.530.40.00.00.077.561.095.8

us-gaap:PaymentsForProceedsFromLoansReceivable



Period End2020-03-312019-03-312018-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0-52060-30300-1
Percentage of PaymentsForProceedsFromLoansReceivable100.0100.0100.0100.00.0100.00.0100.00.00.0100.0

dei:LegalEntity

us-gaap:PaymentsOfCapitalDistribution

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-302010-09-30
Value22222222222222222221
Percentage of PaymentsOfCapitalDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsCommonStock



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value100888378787878727271716666656558554743393433333029282727
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsMinorityInterest



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value7877777722222222222511101111
Percentage of PaymentsOfDividendsMinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDividendsPreferredStockAndPreferenceStock



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value1000000000000000022222222222
Percentage of PaymentsOfDividendsPreferredStockAndPreferenceStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireBuildings



Period End2020-03-312019-03-31
Value141403
Percentage of PaymentsToAcquireBuildings100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:PaymentsToAcquireBusinessesGross

udr:PreferredEquityInvestmentHillsboroOregon



Period End2020-01-31
Value21
Percentage of PaymentsToAcquireBusinessesGross100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

udr:OperatingCommunityInSt.PetersburgFlorida, us-gaap:SubsequentEvent



Period End2020-01-31
Value85
Percentage of PaymentsToAcquireBusinessesGross394.4

udr:PreferredEquityInvestmentHillsboroOregon, us-gaap:SubsequentEvent



Period End2020-01-31
Value21
Percentage of PaymentsToAcquireBusinessesGross100.0

us-gaap:PaymentsToAcquireFurnitureAndFixtures



Period End2020-03-312019-03-31
Value23
Percentage of PaymentsToAcquireFurnitureAndFixtures100.0100.0

us-gaap:PaymentsToAcquireInterestInSubsidiariesAndAffiliates



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value1621192410971322111582530210505016
Percentage of PaymentsToAcquireInterestInSubsidiariesAndAffiliates100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToDevelopRealEstateAssets



Period End2020-03-312019-11-302019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value2397766363417030361125224390445956855628262321121733284044
Percentage of PaymentsToDevelopRealEstateAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:PreferredStockDividendRatePercentage

us-gaap:SeriesEPreferredStock



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-03-31
Value0.080.080.080.080.00.00.00.080.08
Percentage of PreferredStockDividendRatePercentage100.0100.0100.0100.00.00.00.0100.0100.0

us-gaap:PreferredStockDividendsIncomeStatementImpact



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-30
Value111100000000002000000000
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-30
Value111100000020000000000000
Percentage of PreferredStockDividendsIncomeStatementImpact100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0300.0-100.0-100.0-100.0-33.3100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:PreferredStockPerShareAmountsOfPreferredDividendsInArrears

us-gaap:SeriesEPreferredStock



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.38980.37080.37080.37080.34920.34920.34920.33220.66440.00.33220.33220.332199999999999940.33220000000000005
Percentage of PreferredStockPerShareAmountsOfPreferredDividendsInArrears100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

us-gaap:ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital



Period End2020-03-312019-03-312018-03-312017-03-31
Value31059
Percentage of ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-312018-03-312017-03-31
Value4444
Percentage of ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital148.142.777.143.0

dei:LegalEntity

us-gaap:ProceedsFromPaymentsForLongTermLoansForRelatedParties

udr:UnitedDominionRealityLP



Period End2020-03-312019-03-31
Value-56-55
Percentage of ProceedsFromPaymentsForLongTermLoansForRelatedParties100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value-31-6-5-3-20-3-13-10-3-30-1-3-3-3
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfCommercialPaper



Period End2020-03-312019-03-31
Value-85-11
Percentage of ProceedsFromRepaymentsOfCommercialPaper100.0100.0

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value58543514-225-12182-7340-34768236
Percentage of ProceedsFromRepaymentsOfLinesOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:ProceedsFromSaleOfRealEstate

udr:OperatingCommunityInSeattle196Homes



Period End2020-05-07
Value92
Percentage of ProceedsFromSaleOfRealEstate100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:StatementScenario

udr:HomeOperatingCommunity155InSeattle, srt:ScenarioForecast



Period End2020-06-30
Value49
Percentage of ProceedsFromSaleOfRealEstate0.0

us-gaap:RealEstateTaxesAndInsurance



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-30
Value453835363431333129302828302826242526252423252423232221202022202020191918161818
Percentage of RealEstateTaxesAndInsurance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value1313121211111111101110101010101211121211111112111110101010101010
Percentage of RealEstateTaxesAndInsurance30.533.933.734.934.935.235.136.936.536.536.338.334.335.938.250.547.049.147.647.748.746.149.347.648.348.347.448.148.151.053.052.7

us-gaap:RelatedPartyTransactionsByRelatedParty, dei:LegalEntity

us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty

udr:UdrInc, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value323333
Percentage of RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfSecuredDebt



Period End2020-03-312019-03-312018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value201992220714321872223623923721131722028715117212511
Percentage of RepaymentsOfSecuredDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1



Period End2020-03-312019-03-312018-03-312017-03-31
Value231442
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1100.0100.0100.0100.0

us-gaap:DebtInstrument

us-gaap:ShortTermDebtWeightedAverageInterestRateOverTime

us-gaap:CommercialPaper



Period End2020-03-312019-03-312018-03-31
Value0.0180.0280.02
Percentage of ShortTermDebtWeightedAverageInterestRateOverTime100.0100.0100.0

us-gaap:LongtermDebtType

udr:A4.00MediumTermNoteDueOctober2025



Period End2020-03-31
Value0.0453
Percentage of ShortTermDebtWeightedAverageInterestRateOverTime251.7

us-gaap:DebtInstrument

us-gaap:ShorttermDebtAverageOutstandingAmount

us-gaap:CommercialPaper



Period End2020-03-312019-03-312018-03-312017-03-312016-03-31
Value346149306800
Percentage of ShorttermDebtAverageOutstandingAmount100.0100.0100.0100.00.0

us-gaap:DebtInstrument

us-gaap:ShorttermDebtMaximumAmountOutstandingDuringPeriod

us-gaap:CommercialPaper



Period End2020-03-312019-03-312018-03-312017-03-312016-03-31
Value5003303702200
Percentage of ShorttermDebtMaximumAmountOutstandingDuringPeriod100.0100.0100.0100.00.0

us-gaap:StockIssuedDuringPeriodValueConversionOfUnits



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-30
Value77387200111350000-30040000100000001070030
Percentage of StockIssuedDuringPeriodValueConversionOfUnits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-03-312011-12-312011-09-302010-12-312010-09-30
Value77387200111003004100107
Percentage of StockIssuedDuringPeriodValueConversionOfUnits100.0100.0100.0100.0100.099.9100.0100.0-0.0100.0-100.0-94.1100.0100.099.9100.0103.3100.099.9

us-gaap:CommonStock



Period End2020-03-312019-09-302019-06-302019-03-312018-06-302018-03-312017-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-03-31
Value2000.02000.08000.019000.01000.04000.00.0-1000.00.01000.01000.00.02000.01000.0
Percentage of StockIssuedDuringPeriodValueConversionOfUnits0.00.00.00.00.10.00.0100.00.0-0.0-5.90.00.00.1

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-30
Value-111-120-4-10210-14410530121
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-312011-09-30
Value-111-120-4-10210-14410530121
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.1100.0100.0100.0100.0100.0100.0100.1100.0100.0100.0102.699.9100.0100.099.898.3100.0100.099.299.699.9100.0

us-gaap:CommonStock



Period End2020-03-312018-09-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-03-312012-03-31
Value1000.0-1000.01000.00.0-1000.00.03000.0-1000.00.00.04000.0-1000.01000.01000.07000.05000.03000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation-0.1-0.0-0.10.0-0.00.0-2.60.10.00.00.21.70.00.00.80.40.1

us-gaap:TransferToOtherRealEstate



Period End2020-03-312019-03-312017-03-312016-03-31
Value1440320
Percentage of TransferToOtherRealEstate100.0100.0100.00.0

us-gaap:VariableLeaseCost



Period End2020-03-312019-09-302019-06-302019-03-31
Value100000.0100000.0100000.0200000.0
Percentage of VariableLeaseCost100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-09-302019-06-302019-03-31
Value43000.0187000.0143000.0139000.0
Percentage of VariableLeaseCost43.0187.0143.069.5

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-31
Value43000.0187000.0143000.0139000.0
Percentage of VariableLeaseCost43.0187.0143.069.5

dei:LegalEntity

us-gaap:WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302010-09-302010-06-30
Value184184184183183183183183183183018318318301831831830183183183184184184184184184183182179179
Percentage of WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WeightedAverageNumberOfSharesIssuedBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-30
Value294288282277268267267267267267026726726302602592580252251251250250250250234222215
Percentage of WeightedAverageNumberOfSharesIssuedBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:AccumulatedDepreciationofRealEstateHeldforSale



Period End2020-03-312019-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value410770000091000
Percentage of AccumulatedDepreciationofRealEstateHeldforSale100.00.0100.00.00.00.00.0100.0100.00.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

udr:AggregateCommitmentOnNoteReceivable

udr:NoteDueJanuary2023



Period End2020-03-31
Value20
Percentage of AggregateCommitmentOnNoteReceivable100.0

udr:CostIncurredToDate



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value161172114613510761015952970119710711255117411321025981859758647648549605432471776819726624633467332285299241
Percentage of CostIncurredToDate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RealEstateProperties

udr:PreferredEquityInvestments



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value3453372514611097
Percentage of CostIncurredToDate21.447.062.172.013.610.910.2

udr:RealEstateInvestmentOther



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value141264443732281710
Percentage of CostIncurredToDate8.911.311.312.04.23.73.42.91.51.0

udr:WhollyOwnedPropertiesRedevelopment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value171511408631429201111749083807614513411795947565
Percentage of CostIncurredToDate10.99.110.17.60.70.70.60.31.22.62.01.11.31.00.713.915.313.317.630.917.314.413.215.111.913.9

udr:WhollyOwnedPropertiesUnderDevelopment



Period End2020-03-312019-12-312019-09-302018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value95692170168565059253446539334229423819612410492196177321275222467489433452491355
Percentage of CostIncurredToDate58.840.319.165.167.568.361.044.643.431.429.126.023.320.014.413.714.330.332.353.263.847.360.259.759.772.677.676.0

us-gaap:RealEstateProperties, dei:LegalEntity

udr:RealEstateCommunitiesRedevelopment, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value9862
Percentage of CostIncurredToDate5.64.75.54.7

udr:DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-16-82316161413131010
Percentage of DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-30-33-1-2-3-3-5-5-7-7
Percentage of DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost190.9373.9-4.3-16.3-18.6-26.0-40.7-44.1-68.5-75.8

udr:VariableRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value62000.064000.066000.075000.097000.0141000.0179000.0210000.0273000.0304000.0
Percentage of DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost-0.4-0.70.30.50.60.91.41.62.63.0

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value-30-320-2-3-3-5-5-6-7
Percentage of DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost190.5373.2-4.0-15.8-18.0-25.1-39.3-42.6-65.9-72.8

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value14242418191818191717
Percentage of DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost-90.5-273.2104.0115.8118.0125.1139.3142.6165.9172.8

us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentCommittedInvestment

udr:DevelopmentCommunity, udr:OtherInvestmentVentures



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value3418181815151515
Percentage of EquityMethodInvestmentCommittedInvestment100.0100.0100.0100.0100.0100.0100.0100.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentThousandOaksCa



Period End2020-03-31
Value20
Percentage of EquityMethodInvestmentCommittedInvestment58.1

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:PreferredEquityInvestmentThousandOaks



Period End2020-02-29
Value20
Percentage of EquityMethodInvestmentCommittedInvestment0.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentSummarizedFinancialInformationAccountspayableandaccruedliabilities

udr:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value5055736559716363788568665566687465958763524449413441
Percentage of EquityMethodInvestmentSummarizedFinancialInformationAccountspayableandaccruedliabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentSummarizedFinancialInformationCashandcashequivalents

udr:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value3229564144495345463637332832302720363736293240413641
Percentage of EquityMethodInvestmentSummarizedFinancialInformationCashandcashequivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value20000.020000.022000.021000.039000.0
Percentage of EquityMethodInvestmentSummarizedFinancialInformationCashandcashequivalents0.10.10.00.10.1

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentSummarizedFinancialInformationOtherAssets

udr:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302018-12-31
Value180172165124
Percentage of EquityMethodInvestmentSummarizedFinancialInformationOtherAssets100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302018-12-31
Value5455
Percentage of EquityMethodInvestmentSummarizedFinancialInformationOtherAssets2.92.83.24.5

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value2328252326
Percentage of EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet

udr:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1868190131013065319333113267326432563236292529122904290128833169317531353074300429702941301230083009312432213235318131893556355035692908276126822692
Percentage of EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value10881106111911361167
Percentage of EquityMethodInvestmentSummarizedFinancialInformationRealEstateNet58.258.236.137.135.3

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:EquityMethodInvestmentSummarizedFinancialInformationSecuredDebtNet

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value426427428430431
Percentage of EquityMethodInvestmentSummarizedFinancialInformationSecuredDebtNet100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:EquityMethodInvestmentSummarizedFinancialInstrumentNoteReceivable

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value220222221220221
Percentage of EquityMethodInvestmentSummarizedFinancialInstrumentNoteReceivable100.0100.0100.0100.0100.0

dei:LegalEntity

udr:GeneralPartnersCapitalAccountUnitsOwnedPercentage

udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.5740.5680.5590.5540.532
Percentage of GeneralPartnersCapitalAccountUnitsOwnedPercentage100.0100.0100.0100.0100.0

us-gaap:Ownership

udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.9530.9570.9570.9570.9490.9490.949
Percentage of GeneralPartnersCapitalAccountUnitsOwnedPercentage166.0171.2172.7179.90.00.00.0

us-gaap:Ownership, dei:LegalEntity

udr:UnitedDominionRealityLP, udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.9530.9570.9570.9570.949
Percentage of GeneralPartnersCapitalAccountUnitsOwnedPercentage166.0168.5171.2172.70.0

udr:InvestmentBuildingAndBuildingImprovementsAndFurnitureFixturesAndEquipment



Period End2020-03-312019-12-312019-09-302018-12-31
Value101781010292608133
Percentage of InvestmentBuildingAndBuildingImprovementsAndFurnitureFixturesAndEquipment100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302018-12-31
Value3077306730553008
Percentage of InvestmentBuildingAndBuildingImprovementsAndFurnitureFixturesAndEquipment30.230.433.037.0

dei:LegalEntity

udr:LimitedPartnersCapitalAccountUnitsOutstandingPercentage

udr:NonAffiliatedPartners



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value0.0470.0430.0430.0430.0430.0510.0490.0490.0490.0490.0490.0490.050.050.050.0510.0510.0510.0510.0510.0510.0510.0510.0510.051
Percentage of LimitedPartnersCapitalAccountUnitsOutstandingPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value0.9530.9570.9570.9570.9570.9490.9490.9490.9490.950.950.950.950.9510.9510.9510.9510.9510.9510.9510.950.950.950.9490.9490.9490.9490.9490.9490.9490.9490.949
Percentage of LimitedPartnersCapitalAccountUnitsOutstandingPercentage2027.72225.62225.62225.62225.61860.80.00.00.00.00.00.00.00.01940.81940.81940.81940.81940.81940.81900.01900.01900.01860.81860.81860.81860.81860.81860.81860.81860.81860.8

us-gaap:Ownership

udr:UDRLighthouseDownREITL.P.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.4160.4170.4160.4160.416
Percentage of LimitedPartnersCapitalAccountUnitsOutstandingPercentage885.1969.8967.4967.4967.4

us-gaap:Ownership, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:NonAffiliatedPartners



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.4260.4320.4410.4460.468
Percentage of LimitedPartnersCapitalAccountUnitsOutstandingPercentage906.41004.71025.61037.2917.6

udr:UnitedDominionRealityLP, udr:NonAffiliatedPartners



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.0470.0430.0430.0430.051
Percentage of LimitedPartnersCapitalAccountUnitsOutstandingPercentage100.0100.0100.0100.0100.0

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

udr:NonAffiliatedPartners, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.0470.0430.0430.0430.051
Percentage of LimitedPartnersCapitalAccountUnitsOutstandingPercentage100.0100.0100.0100.0100.0

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearEight



Period End2020-03-312019-12-312019-09-30
Value301301350
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearEight100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-30
Value1150
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearEight0.40.414.3

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-30
Value1150
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearEight0.40.414.3

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearNine



Period End2020-03-312019-12-312019-09-30
Value422422300
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearNine100.0100.0100.0

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearSeven



Period End2020-03-312019-12-312019-09-30
Value351351427
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearSeven100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-30
Value5151127
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearSeven14.514.529.8

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-30
Value5151127
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearSeven14.514.529.8

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearSix



Period End2020-03-312019-12-312019-09-30
Value473473315
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearSix100.0100.0100.0

us-gaap:LongtermDebtType

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-30
Value300300315
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearSix63.463.4100.0

udr:LongTermDebtMaturitiesRepaymentOfPrincipleInYearTen



Period End2020-03-312019-12-312019-09-30
Value444444380
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearTen100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-30
Value14414480
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearTen32.532.521.1

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-30
Value14414480
Percentage of LongTermDebtMaturitiesRepaymentOfPrincipleInYearTen32.532.521.1

udr:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearTen



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value139911991189327327407327327327327
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearTen100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302018-09-30
Value727216280
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearTen5.26.013.719.7

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value9999189272710727272727
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearTen7.18.315.98.38.326.38.38.38.38.3

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value130011001000300300300300300300300
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearTen92.991.784.191.791.773.791.791.791.791.7

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

udr:NoteReceivableInterestRate

udr:NoteDueApril2020



Period End2020-04-302020-03-31
Value0.080.12
Percentage of NoteReceivableInterestRate100.0100.0

udr:NoteDueJanuary2023



Period End2020-03-31
Value0.1
Percentage of NoteReceivableInterestRate83.3

udr:NumberOfApartmentHomesOwnedAndConsolidatedByCompany



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value47579.047010.043683.042292.041041.039931.040420.040180.039834.039998.039906.039822.039698.039454.040728.040728.040728.040728.039405.039404.039956.039851.040477.040811.041455.041250.041420.041153.041750.041571.041827.041681.0
Percentage of NumberOfApartmentHomesOwnedAndConsolidatedByCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value16434.016434.016434.016434.016434.016434.016434.016434.016434.016698.016698.016698.016698.016698.016974.016974.016974.016974.020569.020569.020809.020814.020753.020482.020482.020746.021685.021660.021660.021660.021992.021846.0
Percentage of NumberOfApartmentHomesOwnedAndConsolidatedByCompany34.535.037.638.940.041.240.740.941.341.741.841.942.142.341.741.741.741.752.252.252.152.251.350.249.450.352.452.651.952.152.652.4

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udr:ParticipatingLoanInterestRateStatedPercentage

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentHillsboroOregon



Period End2020-03-31
Value0.065
Percentage of ParticipatingLoanInterestRateStatedPercentage100.0

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentThousandOaksCa



Period End2020-03-31
Value0.09
Percentage of ParticipatingLoanInterestRateStatedPercentage138.5

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:PreferredEquityInvestmentThousandOaks



Period End2020-02-29
Value0.09
Percentage of ParticipatingLoanInterestRateStatedPercentage0.0

udr:RealEstateHeldForInvestmentNetExcludingRealEstateUnderDevelopmentOrHeldForDisposition



Period End2020-03-312019-12-312019-09-302018-12-31
Value8376840075416541
Percentage of RealEstateHeldForInvestmentNetExcludingRealEstateUnderDevelopmentOrHeldForDisposition100.0100.0100.0100.0

udr:RealEstateOwnedGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value12817126021156411011106801019610327102761020910177999098889787961594219312922991908472842584538383842883378315820781168016818280557851776180538074822772986881
Percentage of RealEstateOwnedGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value388638753861384238273811380837953782381637083694368636743684366436433630425842384248423842194197416541884306426242104182415841394205
Percentage of RealEstateOwnedGross30.330.833.434.935.837.436.936.937.037.537.137.437.738.239.139.439.539.550.350.350.350.650.150.350.151.053.153.251.551.953.053.352.1

us-gaap:StatementBusinessSegments

udr:NonMatureCommunitiesOther



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3840367725342013185412611252106911962087167516001729279525392246223531051789201219812640213522162417247321342181236632912328286533353340332520961701
Percentage of RealEstateOwnedGross30.029.221.918.317.412.412.110.411.720.516.816.217.729.127.024.124.233.821.123.923.431.525.326.629.130.126.327.228.940.929.736.941.441.440.428.724.7

udr:SameCommunitiesMidAtlanticRegion



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2356235023382330232323172308246024532236244024342221140213961532149314231464154115361410140414001433143114281424142112101871134613431340127212691264
Percentage of RealEstateOwnedGross18.418.720.221.221.822.722.423.924.022.024.424.622.714.614.816.516.215.517.318.318.216.816.716.817.217.417.617.817.415.023.817.416.716.615.517.418.4

udr:SameCommunitiesNortheastRegion



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value15011500149814961494187418711869186618651863186018581634163216291648110910831081107874610731071740738736730725142140
Percentage of RealEstateOwnedGross11.711.913.013.614.018.418.118.218.318.318.718.819.017.017.317.517.912.112.812.812.88.912.712.98.99.09.19.18.91.81.7

udr:SameCommunitiesSoutheasternRegion



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value810806799792786779774768764762757752750746741737732730726738788786783791892889885880875870867862856852106110591054
Percentage of RealEstateOwnedGross6.36.46.97.27.47.67.57.57.57.57.67.67.77.87.97.97.97.98.68.89.39.49.39.510.710.810.911.010.710.811.011.110.610.612.914.515.3

udr:SameCommunitiesSouthwesternRegion



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value603456595594448297368366292292289286283283323387394450446443441440438437436350433387413346412411344343464555553
Percentage of RealEstateOwnedGross4.73.65.25.44.22.93.63.62.92.92.92.92.92.93.44.24.34.95.35.35.25.35.25.25.24.35.34.85.14.35.35.34.34.35.67.68.0

udr:SameCommunitiesWesternRegion



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3704381037973784377336663752374136352932296429542944275227882778272423712963260826262358259124192394232324962412237921942371227421742169210223172308
Percentage of RealEstateOwnedGross28.930.232.834.435.336.036.336.435.628.829.729.930.128.629.629.829.525.835.031.031.128.130.829.028.828.330.830.129.127.230.229.327.026.925.631.833.5

us-gaap:StatementBusinessSegments, dei:LegalEntity

udr:NonMatureCommunitiesOther, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value290432288285279
Percentage of RealEstateOwnedGross2.33.42.52.62.7

udr:SameCommunitiesMidAtlanticRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value671669667665663
Percentage of RealEstateOwnedGross5.25.35.86.06.5

udr:SameCommunitiesNortheastRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value408408408407406
Percentage of RealEstateOwnedGross3.23.23.53.74.0

udr:SameCommunitiesSoutheasternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value354352349345340
Percentage of RealEstateOwnedGross2.82.83.03.13.3

udr:SameCommunitiesSouthwesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value144144144143141
Percentage of RealEstateOwnedGross1.11.11.21.31.4

udr:SameCommunitiesWesternRegion, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value20172011200319951981
Percentage of RealEstateOwnedGross15.716.017.318.119.4

udr:RealEstateUnderDevelopmentAccumulatedDepreciation



Period End2020-03-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312010-09-302010-06-302009-12-31
Value0000306310000000000000012111000000001
Percentage of RealEstateUnderDevelopmentAccumulatedDepreciation100.0100.00.00.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.0100.00.0100.00.00.0100.0100.0100.0100.0100.00.00.00.0100.0100.00.0100.0100.0100.0

udr:RealEstatesOwnedAccumulatedDepreciation



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4272413140003878376436543626351934133330323731323026292329412842274426462647255725222434237923392279220821552071200719241842176918631831180417261638
Percentage of RealEstatesOwnedAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-09-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value1831179617621727169216581627159315571543152014821445140813891518144714031358131312681241123211871142109710521015976
Percentage of RealEstatesOwnedAccumulatedDepreciation42.943.544.044.545.045.444.945.345.646.447.047.347.848.247.357.457.457.657.156.155.656.257.257.356.957.057.157.453.3

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udr:SecuredDebtIncludingDebtOnRealEstateHeldForSale

udr:FixedRateDebt, us-gaap:Mortgages, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:Mortgages



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
Value903906575414416417419391393395397399401402321322440442406408411401
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value2727279494949494949494949494949494949494
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale3.03.04.722.822.722.722.624.224.123.923.623.529.529.321.521.423.323.223.023.6

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

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Period End2020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312013-12-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value203204909090285285285285285285355626631631632743744897
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale22.522.621.721.621.568.172.972.672.371.971.688.30.00.00.00.00.00.00.0

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Period End2020-03-312019-12-312019-11-302019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value883884313575414416417419391393395397399402438440443445448450453455464466552590
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale97.897.60.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value11171122573503505506703676677679681756
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale123.7123.999.6121.4121.3121.2167.8172.6172.2171.8171.5187.6

udr:VariableRateDebt, udr:TaxExemptNotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value2727279494949494949494949494949494949494949494949494
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale3.03.04.722.822.722.722.624.224.123.923.823.723.50.00.00.00.00.00.00.00.00.00.00.00.00.0

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value26262694949494123123123123123374
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale3.03.04.722.822.722.622.531.531.431.231.130.993.0

us-gaap:FairValueByAssetClass

us-gaap:LineOfCredit



Period End2020-03-31
Value203
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale22.5

us-gaap:LongtermDebtType

udr:MediumTerm3.10PercentageNoteDueNovember2034



Period End2020-03-31
Value298
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale33.1

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value114411496005985996017987998018038041031113010481256137413761346135013701361139914021442144213811385142514301891
Percentage of SecuredDebtIncludingDebtOnRealEstateHeldForSale126.7126.8104.3144.2144.0143.8190.3204.1203.6203.0202.5257.1280.6326.5389.3311.9311.1331.6330.4333.3339.40.00.00.00.00.00.00.00.00.0

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udr:UnsecuredDebtInstrumentsFairValue

us-gaap:LineOfCredit, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-31
Value24
Percentage of UnsecuredDebtInstrumentsFairValue100.0

us-gaap:RevolvingCreditFacility, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-31
Value50
Percentage of UnsecuredDebtInstrumentsFairValue201.6

us-gaap:SeniorNotes, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value3466339734152978289728292509251125422611262326112302230423832096207721082128181618522144213621541974214921571863205020392039203920391675
Percentage of UnsecuredDebtInstrumentsFairValue13977.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:LineOfCredit, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-31
Value24
Percentage of UnsecuredDebtInstrumentsFairValue100.0

us-gaap:LineOfCredit, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value24362124625976150110152
Percentage of UnsecuredDebtInstrumentsFairValue100.00.00.00.00.00.00.00.00.0

us-gaap:RevolvingCreditFacility, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-31
Value50
Percentage of UnsecuredDebtInstrumentsFairValue201.6

us-gaap:RevolvingCreditFacility, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-31
Value50
Percentage of UnsecuredDebtInstrumentsFairValue201.6

us-gaap:SeniorNotes, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value3474326332602862286228612561256125612561256125612262226122611961197220562056175617562069206820681897208120811781190319031605
Percentage of UnsecuredDebtInstrumentsFairValue14011.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:SeniorNotes, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-31
Value3466339734152978289728292509251125422611262326112302230423832096207721082128181618522144214920391675
Percentage of UnsecuredDebtInstrumentsFairValue13977.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value8290726365767374831029692741039191778156726391828976118
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



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
Value1012121413141211101212121417171620121818132223302635
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent12.713.616.723.120.718.616.415.512.712.613.013.319.116.819.118.226.915.933.325.521.824.629.033.934.530.1

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value332942232720382124183519231736231618
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value8211582115821048211542
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent26.19.527.921.931.613.129.622.934.614.630.724.736.412.131.222.625.614.8

us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value2360246224962336228120632075192918081871184317921644158517461712168515841610152515571528149314781414-1342-13211279121011431082102411261142111110751045-973895822687
Percentage of AccumulatedDistributionsInExcessOfNetIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdditionalPaidInCapital



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value57885781570252445184492046194639463846514643464046354635463146224620444744494342433442234223411441104109410641044101409840984098354333403322278225482450243720611948
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AdvanceRent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value484836353635313435313235363437373536333334
Percentage of AdvanceRent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value171714141415131515131415151415161615
Percentage of AdvanceRent36.837.140.940.841.243.542.943.742.743.743.743.643.042.641.543.845.943.8

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-31
Value160160424140454342401918171919191916161515151483640
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value151153383940474947462522212424191916161515151418448483666666640
Percentage of AssetsFairValueDisclosure94.495.990.794.199.9104.4113.9113.5115.7128.8123.5125.3126.0122.9100.9101.099.098.698.197.797.597.60.00.00.099.00.00.00.098.60.0

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-31
Value160160434343495149472522212424191916161515151483640
Percentage of AssetsFairValueDisclosure100.0100.0101.7103.9108.2110.6118.7116.7117.4129.4123.4125.3125.7122.2100.0100.0100.1100.1100.0100.1100.2100.6100.0100.00.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets

udr:HomeOperatingCommunity294TampaFlorida



Period End2020-01-31
Value83
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets100.0

udr:PreferredEquityInvestmentHillsboroOregon



Period End2020-01-31
Value67
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets81.6

us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312015-12-31
Value404040353525
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:HomeOperatingCommunity294TampaFlorida



Period End2020-01-31
Value2
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

udr:PreferredEquityInvestmentHillsboroOregon



Period End2020-01-31
Value1
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill0.0

us-gaap:DebtInstrument

us-gaap:CommercialPaperAtCarryingValue

us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-07-312018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value21530060392901014153953552753002852400
Percentage of CommercialPaperAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:CommercialPaper, udr:UnsecuredRevolvingCreditFacilityDueTwoThousandTwenty



Period End2020-03-312019-12-31
Value215300
Percentage of CommercialPaperAtCarryingValue100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

udr:CommercialBank, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2153006039290101415355275300285240
Percentage of CommercialPaperAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

udr:CommercialBank, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2153006039290101415355275300285240
Percentage of CommercialPaperAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

udr:CommercialBank, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value2153006039290101415355275300285240
Percentage of CommercialPaperAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption



Period End2020-03-31
Value-2
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDistributionsInExcessOfNetIncome



Period End2020-03-312017-12-31
Value-20
Percentage of CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption100.00.0

us-gaap:DebtInstrumentCarryingAmount



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value486946983959388636063564382637653694368436893644354534103557347734243583
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value10861089572501502503699670672673674675746747669826945947
Percentage of DebtInstrumentCarryingAmount22.323.214.512.913.914.118.317.818.218.318.318.521.121.918.823.827.626.4

udr:VariableRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value27272794949494123123123123123277375375425425425
Percentage of DebtInstrumentCarryingAmount0.60.60.72.42.62.72.53.33.33.43.43.47.811.010.612.212.411.9

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value11131116599595596597794794795796798799102311231045125213701372
Percentage of DebtInstrumentCarryingAmount22.923.815.115.316.516.820.821.121.521.621.621.928.932.929.436.040.038.3

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value375535823360329130092966303129702898288728912845252122862512222420532210
Percentage of DebtInstrumentCarryingAmount77.176.284.984.783.583.279.278.978.578.478.478.171.167.170.664.060.061.7

us-gaap:LongtermDebtType

us-gaap:DebtInstrumentFaceAmount

udr:MediumTermNotesDueAugust2031



Period End2020-03-31
Value150
Percentage of DebtInstrumentFaceAmount100.0

udr:SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030



Period End2020-02-292019-10-312019-07-31
Value200100300
Percentage of DebtInstrumentFaceAmount0.00.00.0

us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, dei:LegalEntity

us-gaap:DebtInstrumentFairValue

udr:FixedRateDebt, us-gaap:Mortgages, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-30
Value7368
Percentage of DebtInstrumentFairValue100.0100.0

us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:LineOfCredit, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:LineOfCredit



Period End2020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value213213909090288288292
Percentage of DebtInstrumentFairValue289.20.00.00.00.00.00.00.0

udr:FixedRateDebt, us-gaap:Mortgages, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:Mortgages



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value908898569425423416415386397
Percentage of DebtInstrumentFairValue1232.80.0829.10.00.00.00.00.00.0

udr:VariableRateDebt, udr:TaxExemptNotesPayable, us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, udr:TaxExemptNotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value272727949494949494
Percentage of DebtInstrumentFairValue36.70.039.30.00.00.00.00.00.0

us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, dei:LegalEntity

udr:FixedRateDebt, us-gaap:Mortgages, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-30
Value737168
Percentage of DebtInstrumentFairValue100.00.0100.0

us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:LineOfCredit, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:LineOfCredit



Period End2020-03-31
Value216
Percentage of DebtInstrumentFairValue293.5

udr:FixedRateDebt, us-gaap:LineOfCredit, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:LineOfCredit



Period End2020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value213213909090288288292
Percentage of DebtInstrumentFairValue289.20.00.00.00.00.00.00.0

udr:FixedRateDebt, us-gaap:Mortgages, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:Mortgages



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value908898569425423416415386397
Percentage of DebtInstrumentFairValue1232.80.0829.10.00.00.00.00.00.0

udr:VariableRateDebt, udr:TaxExemptNotesPayable, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, udr:TaxExemptNotesPayable



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value272727949494949494
Percentage of DebtInstrumentFairValue36.70.039.30.00.00.00.00.00.0

dei:LegalEntity

us-gaap:DebtInstrumentInterestRateEffectivePercentage

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-03-31
Value0.03280.03430.03630.03640.0373
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, dei:LegalEntity

udr:NoteDueDecember2028, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value0.03280.03430.03630.0364
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:VariableRateDebt, udr:TaxExemptSecuredNotesPayable



Period End2020-03-312019-09-30
Value0.01910.0207
Percentage of DebtInstrumentInterestRateEffectivePercentage58.257.0

us-gaap:Range, us-gaap:DebtInstrument, us-gaap:FairValueByAssetClass

srt:Minimum, udr:FixedRateDebt, us-gaap:Mortgages



Period End2020-03-312019-09-302019-06-302019-03-31
Value0.0270.0270.03150.0315
Percentage of DebtInstrumentInterestRateEffectivePercentage82.374.486.50.0

us-gaap:LongtermDebtType

us-gaap:DebtInstrumentUnamortizedDiscount

udr:A3.50MediumTermNoteDueJuly2027



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value511000.0529000.0547000.0564000.0600000.0617000.0635000.0653000.0670000.0687000.0705000.00.0
Percentage of DebtInstrumentUnamortizedDiscount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

udr:A3.50MediumTermNotesDueJanuary2028



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0001111110
Percentage of DebtInstrumentUnamortizedDiscount180.8180.3179.7179.6178.7178.6178.3177.8177.80.0

udr:A3.75MTNDueJuly2024



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value443000.0470000.0495000.0521000.0574000.0599000.0626000.0652000.0678000.0704000.0730000.0756000.0782000.0808000.0834000.0860000.0938000.0912000.0938000.0964000.0990000.01000000.01000000.0
Percentage of DebtInstrumentUnamortizedDiscount86.788.890.592.495.797.198.699.8101.2102.5103.50.00.00.00.00.00.00.00.00.00.00.00.0

udr:A4.00MediumTermNoteDueOctober2025



Period End2020-03-312019-12-312019-09-302018-12-31
Value379000.0396000.0413000.0465000.0
Percentage of DebtInstrumentUnamortizedDiscount74.274.975.577.5

udr:FourPointFourZeroPercentMediumTermNoteDueJanuaryTwoThousandTwentyNine



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value5000.05000.06000.06000.06000.00.0
Percentage of DebtInstrumentUnamortizedDiscount1.00.91.11.11.00.0

udr:MediumTerm3.00PercentageNoteDueAugust2031



Period End2020-03-312019-12-312019-09-302018-12-31
Value1110
Percentage of DebtInstrumentUnamortizedDiscount215.1212.3209.90.0

udr:MediumTerm3.10PercentageNoteDueNovember2034



Period End2020-03-312019-12-312018-12-31
Value110
Percentage of DebtInstrumentUnamortizedDiscount251.9247.40.0

udr:SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030



Period End2020-03-312019-12-312019-09-302018-12-31
Value13200
Percentage of DebtInstrumentUnamortizedDiscount2630.5431.2181.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-31
Value-30-33
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0

us-gaap:DebtInstrumentUnamortizedPremium



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value323533455678911
Percentage of DebtInstrumentUnamortizedPremium100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, dei:LegalEntity

us-gaap:DeferredFinanceCostsNet

udr:VariableRateDebt, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value62000.064000.066000.068000.071000.0
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:VariableRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value62000.064000.066000.075000.097000.0119000.0141000.0179000.0210000.0242000.0273000.0304000.0939000.0
Percentage of DeferredFinanceCostsNet100.0100.0100.0110.30.0167.60.00.00.00.00.00.00.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, dei:LegalEntity

udr:FixedRateDebt, us-gaap:Mortgages, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-30
Value356000.0365000.0370000.0
Percentage of DeferredFinanceCostsNet574.2570.3560.6

us-gaap:LongtermDebtType

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value232119151616141414141312
Percentage of DeferredFinanceCostsNet37596.833831.229442.422625.00.023116.90.00.00.00.00.00.0

us-gaap:DeferredGainOnSaleOfProperty



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value99101010111111111010109988769652427242525-25-25-29292929292929292828282828
Percentage of DeferredGainOnSaleOfProperty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral

us-gaap:OtherLiabilities, us-gaap:InterestRateContract, us-gaap:DesignatedAsHedgingInstrument



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-30
Value300020001322391710233461111
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:InterestRateContract, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value30002000132239171023346
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:InterestRateContract, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value30002002334611
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateContract, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value300020001322391710411
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral



Period End2020-03-312019-12-312019-09-302019-03-312018-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value30020001322391710233467911
Percentage of DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value3000200001322391710233467911
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DevelopmentInProcess



Period End2020-03-312019-12-312019-09-302018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value956921347335644588532465393342294238196124104921961773212752224664864324514893552822252481921571129794153318
Percentage of DevelopmentInProcess100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

udr:BuildingImprovementsFurnitureFixturesAndEquipment



Period End2020-03-312019-12-31
Value6640
Percentage of DevelopmentInProcess69.458.1

us-gaap:DividendsPayableCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value115109108105105979595959191919186868686807575756969686861616161575757535147423736363230
Percentage of DividendsPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value666363636359595959575757575454545450505050474747474343434340404039373633
Percentage of DividendsPayableCurrentAndNoncurrent58.057.958.260.060.160.962.362.562.562.462.462.462.462.362.362.362.363.467.167.867.868.868.869.769.769.970.270.270.270.470.471.178.178.186.191.8

us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentOwnershipPercentage

udr:OperatingCommunity, udr:UnconsolidatedJointVentureOneUDRMetLifePartnership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value0.50.50.50.50.50.50.50.50.50.1960.1850.1720.16410.1610.1570.1570.00.00.1390.1320.1320.1320.133
Percentage of EquityMethodInvestmentOwnershipPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0

udr:OperatingCommunity, udr:UnconsolidatedJointVentureOtherMetLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value0.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.5060.358
Percentage of EquityMethodInvestmentOwnershipPercentage101.2101.2101.2101.2101.2101.20.00.00.00.00.00.0101.2101.2101.2258.2273.5294.2308.3314.3322.3322.3271.2

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:PreferredEquityInvestmentHillsboroOregon



Period End2020-01-312019-12-312017-12-31
Value1.00.490.49
Percentage of EquityMethodInvestmentOwnershipPercentage0.098.00.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, us-gaap:SubsequentEventType

udr:PreferredEquityInvestmentHillsboroOregon, us-gaap:SubsequentEvent



Period End2020-01-31
Value1.0
Percentage of EquityMethodInvestmentOwnershipPercentage0.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationAssets

udr:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2081210333233373336534853412338033563321298029672950295231213218322232023156307430303219309030813078319832953303324832663680365536752998291628452807
Percentage of EquityMethodInvestmentSummarizedFinancialInformationAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value13141334134613611394
Percentage of EquityMethodInvestmentSummarizedFinancialInformationAssets63.163.440.540.340.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationEquity

udr:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value89590013401290127412881240123112311231105210621080109113231436147814841475147414591437137113671369142114431456150815181811181618061437132713111212
Percentage of EquityMethodInvestmentSummarizedFinancialInformationEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value863878892907936
Percentage of EquityMethodInvestmentSummarizedFinancialInformationEquity96.597.666.670.372.6

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationLiabilities

udr:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1186120319832082209121962172214821242089192719051869186117971781174317171681159915711781171917141709177618521846174017471869182318681561157415191580
Percentage of EquityMethodInvestmentSummarizedFinancialInformationLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value450455454454458
Percentage of EquityMethodInvestmentSummarizedFinancialInformationLiabilities38.037.922.921.820.9

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities

udr:UnconsolidatedJointVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-31
Value1136114819091886203221252108208120422005185718371811179416521707167816141586152915141504165916631667172217771663
Percentage of EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value585585791769749780767739732720839843818827917933944938921914763718650612517507531558490507579580213
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



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
Value69768289951035360677685941031121211341481660
Percentage of EquityMethodInvestments11.913.010.411.612.813.27.08.29.210.710.211.212.613.613.214.415.817.70.0

us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty

udr:DevelopmentCommunity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-31
Value276272247221189224198155136159272244
Percentage of EquityMethodInvestments47.346.531.328.825.328.725.821.018.722.132.429.5

udr:OperatingCommunity



Period End2020-03-312019-12-31
Value308313
Percentage of EquityMethodInvestments52.753.5

us-gaap:MortgageLoansOnRealEstateDescriptionTypeOfProperty, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:DevelopmentCommunity, udr:OtherInvestmentPortalsWashingtonDc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value494846454443413530261710
Percentage of EquityMethodInvestments8.48.25.95.95.95.55.54.84.23.72.01.3

udr:DevelopmentCommunity, udr:OtherInvestmentVentures



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value14131264422210
Percentage of EquityMethodInvestments2.52.31.60.90.60.50.40.30.30.20.1

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1200BroadwayNashvilleTn



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value6563626160584835241812
Percentage of EquityMethodInvestments11.210.97.98.08.07.66.44.83.42.51.5

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1300FairmountPhiladelphiaPa



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value555136231382
Percentage of EquityMethodInvestments9.58.74.63.01.91.10.3

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1532HarrisonSanFranciscoCa



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value3130292828242116131196
Percentage of EquityMethodInvestments5.45.23.83.83.83.22.82.31.91.61.10.8

udr:DevelopmentCommunity, udr:PreferredEquityInvestment1641LincolnSantaMonicaCa



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1010109998
Percentage of EquityMethodInvestments1.81.81.31.31.31.21.2

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentEssexOrlandoFl



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value151414131196
Percentage of EquityMethodInvestments2.62.51.81.81.61.30.8

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentModeraLakeMerrittOakland



Period End2020-03-312019-12-312019-09-302019-06-30
Value28221714
Percentage of EquityMethodInvestments4.93.92.21.9

udr:DevelopmentCommunity, udr:PreferredEquityInvestmentThousandOaksCa



Period End2020-03-31
Value5
Percentage of EquityMethodInvestments1.0

udr:OperatingCommunity, udr:UnconsolidatedJointVentureOneUDRMetLifePartnership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value28282930303029252021181514141313004147495275
Percentage of EquityMethodInvestments4.94.93.73.94.13.93.63.02.22.31.91.71.61.61.81.90.00.08.19.49.39.414.8

udr:OperatingCommunity, udr:UnconsolidatedJointVentureOtherMetLife



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value949810210711111511912413313514014215616016316417717116315814513436
Percentage of EquityMethodInvestments16.116.812.914.014.914.815.616.818.218.816.716.919.119.517.817.718.818.317.817.319.118.87.2

udr:OperatingCommunity, udr:UnconsolidatedJointVentureSevenUdrMetlifeIiPartnership



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value150150300302303296299300301303307309309311404418421425425428429431436439325327327323327
Percentage of EquityMethodInvestments25.725.838.039.340.638.039.140.741.242.136.636.737.837.644.144.944.645.346.246.856.360.067.271.862.864.661.657.964.5

udr:OperatingCommunity, udr:UnconsolidatedJointVentureWestCoastDevelopmentJv



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value34343535353636373737
Percentage of EquityMethodInvestments6.06.04.44.64.84.64.85.05.15.3

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

udr:MarketPropertiesLlcThirteenth



Period End2020-03-31
Value3
Percentage of EquityMethodInvestments0.6

us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName, dei:LegalEntity

udr:UDRLighthouseDownREITL.P., udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value69768289103
Percentage of EquityMethodInvestments11.913.010.411.613.2

dei:LegalEntity

us-gaap:GeneralPartnersCapitalAccount

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value000000000000111111111111111111111111
Percentage of GeneralPartnersCapitalAccount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Ownership

us-gaap:GeneralPartnersCapitalAccountUnitsOutstanding

udr:UnitedDominionRealityLP



Period End2020-03-31
Value100000.0
Percentage of GeneralPartnersCapitalAccountUnitsOutstanding100.0

us-gaap:Ownership, dei:LegalEntity

udr:UnitedDominionRealityLP, udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value001761760
Percentage of GeneralPartnersCapitalAccountUnitsOutstanding0.20.00.00.00.0

us-gaap:LongtermDebtType

us-gaap:GuaranteeObligationsMaximumExposure

udr:SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030



Period End2020-03-312019-09-30
Value600300
Percentage of GuaranteeObligationsMaximumExposure100.0100.0

udr:ThreePointOneZeroPercentSeniorUnsecuredNotesDue2034



Period End2020-03-31
Value300
Percentage of GuaranteeObligationsMaximumExposure50.0

us-gaap:InterestPayableCurrentAndNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value3145274229382738283330282729282628292327233427292732262929302931312323232020192019
Percentage of InterestPayableCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

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Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value000000000000111111333333333233331020
Percentage of InterestPayableCurrentAndNoncurrent0.70.50.80.10.10.12.21.62.21.92.02.14.24.84.85.14.75.313.411.413.89.611.811.011.810.312.710.012.511.611.712.28.13.79.12.5

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value588588791769749780767739732720839843818827917933944938
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



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
Value6976828995103536067768594112
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure11.813.010.411.612.813.27.08.29.210.710.211.213.6

us-gaap:LandImprovements



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
Value225224220217214213195194190189186183180178175178175173189
Percentage of LandImprovements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value9796959392929089888984
Percentage of LandImprovements43.343.143.143.143.243.146.446.046.647.047.4

dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value515519
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value514517403335337
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue99.799.70.00.00.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value11
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue0.30.3

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value514517403335
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue99.799.70.00.0

dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value456456
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value455455370313313
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive99.899.80.00.00.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value795000.0869000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive0.20.2

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value455455370313
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive99.899.80.00.0

dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value1212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value1212744
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive98.898.70.00.00.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value156000.0166000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive1.21.3

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value121274
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive98.898.70.00.0

dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value1212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value1212744
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour98.898.70.00.00.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value153000.0163000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour1.21.3

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value121274
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour98.898.70.00.0

dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value1212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value1212744
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree98.898.70.00.00.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value150000.0159000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree1.21.3

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value121274
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree98.898.70.00.0

dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value1212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value1212744
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo98.898.80.00.00.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value147000.0156000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo1.21.2

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value121274
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo98.898.80.00.0

dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

udr:UnitedDominionRealityLP



Period End2020-03-31
Value9
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-09-302019-06-302019-03-31
Value9123
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear98.90.00.00.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-31
Value108000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear1.1

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value912
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear98.90.00.0

dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value316319
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Land



Period End2020-03-312019-12-312019-09-302019-06-302019-03-31
Value316318273248249
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount99.999.90.00.00.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

udr:EquipmentLeases, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-31
Value189000.0222000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount0.10.1

us-gaap:Land, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-30
Value316318273248
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount99.999.90.00.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceived

us-gaap:AssetsLeasedToOthers



Period End2020-03-312019-09-302019-06-302019-03-31
Value178172178171
Percentage of LessorOperatingLeasePaymentsToBeReceived100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:AssetsLeasedToOthers, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value465051
Percentage of LessorOperatingLeasePaymentsToBeReceived26.029.128.8

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFiveYears

us-gaap:AssetsLeasedToOthers



Period End2020-03-312019-09-302019-06-302019-03-31
Value17161615
Percentage of LessorOperatingLeasePaymentsToBeReceivedFiveYears100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:AssetsLeasedToOthers, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value566
Percentage of LessorOperatingLeasePaymentsToBeReceivedFiveYears32.438.738.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears

us-gaap:AssetsLeasedToOthers



Period End2020-03-312019-09-302019-06-302019-03-31
Value19181817
Percentage of LessorOperatingLeasePaymentsToBeReceivedFourYears100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:AssetsLeasedToOthers, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value666
Percentage of LessorOperatingLeasePaymentsToBeReceivedFourYears32.937.837.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear

us-gaap:AssetsLeasedToOthers



Period End2020-03-312019-09-302019-06-302019-03-31
Value1641014
Percentage of LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:AssetsLeasedToOthers, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value513
Percentage of LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear33.736.536.1

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter

us-gaap:AssetsLeasedToOthers



Period End2020-03-312019-09-302019-06-302019-03-31
Value81929285
Percentage of LessorOperatingLeasePaymentsToBeReceivedThereafter100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:AssetsLeasedToOthers, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value141919
Percentage of LessorOperatingLeasePaymentsToBeReceivedThereafter18.121.421.2

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears

us-gaap:AssetsLeasedToOthers



Period End2020-03-312019-09-302019-06-302019-03-31
Value20191918
Percentage of LessorOperatingLeasePaymentsToBeReceivedThreeYears100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:AssetsLeasedToOthers, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value677
Percentage of LessorOperatingLeasePaymentsToBeReceivedThreeYears32.237.636.8

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears

us-gaap:AssetsLeasedToOthers



Period End2020-03-312019-09-302019-06-302019-03-31
Value22202019
Percentage of LessorOperatingLeasePaymentsToBeReceivedTwoYears100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType, dei:LegalEntity

us-gaap:AssetsLeasedToOthers, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value777
Percentage of LessorOperatingLeasePaymentsToBeReceivedTwoYears32.537.837.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:LiabilitiesFairValueDisclosure

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-31
Value300020000132239171041113
Percentage of LiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-31
Value4903485341064014365035313773371636793746376437053597346337093663356936713626366236593711364636434091
Percentage of LiabilitiesFairValueDisclosure159479.43417743.0875561.41586593.3159741.5992064.00.0816730.50.00.00.00.039968933.3838553.5202566.9103075.4157881.8173824.4113151.640207.921383.535794.273437.633054.629949.8

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, dei:LegalEntity

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value10098952727
Percentage of LiabilitiesFairValueDisclosure3273.669701.420398.510671.97584.3

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value4913473139583887360935663827376836973688369436503552341835633484343135903516357335333593363037513632352834693402350834203935
Percentage of LiabilitiesFairValueDisclosure159796.63332109.2843952.91536565.2157977.51001690.40.0828195.20.00.00.00.039472055.6827622.0194599.898052.8151755.8170020.3109717.339230.620650.934659.30.00.00.071070.90.00.00.031032.128807.0

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-312011-12-31
Value4907485341064014365235323773371636793746376437053597346337103666357136733629367136763721365136544104
Percentage of LiabilitiesFairValueDisclosure159579.43417843.0875661.41586693.3159841.5992164.00.0816830.50.00.00.00.039969033.3838653.5202666.9103175.4157981.8173924.4113251.640307.921483.535894.273537.633154.630049.8

us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, dei:LegalEntity

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value9999992727
Percentage of LiabilitiesFairValueDisclosure3235.870070.421215.410671.97584.3

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value10098952727
Percentage of LiabilitiesFairValueDisclosure3273.669701.420398.510671.97584.3

dei:LegalEntity

us-gaap:LimitedPartnersCapitalAccount

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value131013471381141114411471144114701502146314571491153515771577161916631712164816841688170217181757178017971819185218851921196220032040204820442046
Percentage of LimitedPartnersCapitalAccount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LimitedPartnersCapitalAccountUnitsOutstanding



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-312012-12-312012-03-312011-12-312011-09-302011-06-302010-12-312009-12-31
Value18418418418418418318318318318318318318318318318318318499975179
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

udr:NonAffiliatedPartners



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value077779999999999999999999
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding0.04.34.34.34.30.00.00.04.90.00.00.05.00.00.00.05.10.00.00.05.10.00.0100.0

udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value176176176176175174174174174174174174174174174174174174174174174174174173173174174174174174174174
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding95.395.795.795.795.694.894.894.894.895.095.095.095.095.00.00.00.095.00.00.00.094.90.00.094.90.00.00.094.80.00.01854.8

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value184183183183183183183183183183183183183183183183183183183183183183183183183183184184184184184184184184182179
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding99.999.999.999.999.999.999.999.999.999.999.999.999.999.90.00.00.099.90.00.00.099.90.00.00.099.90.00.00.099.90.00.01954.81953.22390.23551.9

us-gaap:LimitedPartnersCapitalAccountByClass, dei:LegalEntity

udr:ClassLimitedPartner, udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-31
Value100000.0100000.0121661.0121661.0121661.0121000.0121000.0
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding0.10.10.10.10.10.10.1

udr:ClassLimitedPartner, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value11111
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding1.01.01.01.01.0

us-gaap:LimitedPartnersCapitalAccountByClass, us-gaap:PartnerTypeOfPartnersCapitalAccount

udr:ClassLimitedPartner, udr:NonAffiliatedPartners



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-312013-12-31
Value11111111111111111
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding1.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.01.0

us-gaap:Ownership

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value0176176176176174174174174174174
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding0.095.795.795.795.794.994.994.994.995.095.1

us-gaap:Ownership, dei:LegalEntity

udr:UnitedDominionRealityLP, udr:NonAffiliatedPartners



Period End2020-03-312019-12-312019-09-302019-06-30
Value0777
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding0.04.34.34.3

us-gaap:PartnerTypeOfPartnersCapitalAccount

us-gaap:LimitedPartner



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value666667777777777734
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding3.73.33.33.33.44.24.24.24.24.04.04.04.04.14.181.465.42.4

us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

udr:ClassLimitedPartner, udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value121000.0121000.0121661.0121661.0121661.0
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding0.10.10.10.10.1

udr:NonAffiliatedPartners, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value87779
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding4.74.34.34.35.1

us-gaap:GeneralPartner, udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-31
Value111000.0111000.0110883.0110883.0110883.0111000.0111000.0
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding0.10.10.10.10.10.10.1

us-gaap:LimitedPartner, udr:UdrInc



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312017-12-312016-12-31
Value175175175175174174173
Percentage of LimitedPartnersCapitalAccountUnitsOutstanding95.295.695.695.694.894.994.9

us-gaap:LineOfCredit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value2222333333332222222211222222233
Percentage of LineOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

udr:UdrBankCreditFacility, us-gaap:RevolvingCreditFacility



Period End2020-03-31
Value50
Percentage of LineOfCredit2000.0

us-gaap:LongtermDebtType

udr:UnsecuredRevolvingCreditFacility



Period End2020-03-312019-12-31
Value500
Percentage of LineOfCredit2000.00.0

udr:UnsecuredRevolvingCreditFacilityDueTwoThousandTwentyThree



Period End2020-03-31
Value50
Percentage of LineOfCredit2000.0

udr:UnsecuredWorkingCapitalCreditFacilityDueJanuary2021



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value2416343354051495721
Percentage of LineOfCredit991.9571.81230.21236.21645.80.51545.81469.01748.7659.6

us-gaap:LongtermDebtType, dei:LegalEntity

udr:UnsecuredCommercialPaper, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value21530060392101
Percentage of LineOfCredit8600.010344.82142.914518.53063.6

us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityInterestRateAtPeriodEnd

us-gaap:CommercialPaper



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.0160.020.0230.0260.0280.0290.0240.0250.0230.02
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:PartnerTypeOfPartnersCapitalAccount, dei:LegalEntity

udr:VariableRateDebt, us-gaap:Mortgages, udr:OperatingPartnership, udr:UnitedDominionRealityLP



Period End2020-03-312019-09-302019-06-30
Value0.01910.02070.0213
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd119.490.081.9

us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

udr:UdrBankCreditFacility, us-gaap:RevolvingCreditFacility



Period End2020-03-31
Value0.018
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd112.5

us-gaap:LongtermDebtType

udr:UnsecuredWorkingCapitalCreditFacilityDueJanuary2021



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value0.0180.0260.0280.0320.0330.0330.0310.030.0280.025
Percentage of LineOfCreditFacilityInterestRateAtPeriodEnd112.5130.0121.7123.1117.9113.8129.2120.0121.7125.0

us-gaap:LineOfCreditFacility

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

udr:UdrBankCreditFacility



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-10-252011-09-302011-06-302010-12-31
Value200020002000200020002000200020002000200020002000200020002000200020009009009009009009009009009009009009009009009009001350600600600
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive



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
Value410410391391391391401401401401351401351351650725540620313313313316874874875875243243243244
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value95954141414111111111170170170170245245245248176176176176178178178179
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive23.223.210.510.510.510.50.30.30.30.30.30.30.30.326.223.531.627.578.478.478.478.620.220.220.220.273.373.373.373.5

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value95954141414111111111170170170170313313313316226226226226243243243244
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive23.223.210.510.510.510.50.30.30.30.30.30.30.30.326.223.531.627.5100.0100.0100.0100.025.925.925.925.9100.0100.0100.0100.0

us-gaap:UnsecuredDebt



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
Value31531535035035035040040040040035040035035048055537045000006486486486480000
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive76.876.889.589.589.589.599.799.799.799.799.799.799.799.773.876.568.472.50.00.00.00.074.174.174.174.10.00.00.00.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour



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
Value69566040140140140152401408351498351498498382319321315857858874874402519530243568568570568
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value295310111111111981198198247247247247121121121120177177177178136136138136
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour42.547.00.30.30.30.32.10.30.30.339.80.339.839.864.877.577.078.514.214.213.913.844.234.333.573.324.024.024.224.0

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value295310111111111981198198315315315315209209226225242242242243136136138136
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour42.547.00.30.30.30.32.10.30.30.339.80.339.839.882.598.798.0100.024.424.425.925.860.346.845.8100.024.024.024.224.0

us-gaap:UnsecuredDebt



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
Value40035040040040040051399407350300350300300664606486486486481602762870432432432432
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour57.553.099.799.799.799.797.999.799.799.760.299.760.260.217.51.32.00.075.675.674.174.239.753.254.20.076.076.075.876.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree



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
Value933534551498498498498357498353338511511511511384731663395250250288282521750691597
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value93111119819819819824919824924973737373177177177177136136138136197197197197
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0100.03.13.22.098.639.839.839.839.869.739.870.673.714.314.314.314.346.324.326.845.054.554.547.948.337.826.328.533.0

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value931111198198198198317198317317211211211211274274274242167167206200197197197197
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree100.0100.03.13.22.098.639.839.839.839.888.639.889.893.741.341.341.341.371.437.541.361.467.167.171.470.837.826.328.533.0

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo



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
Value332010849849849826731731733833335751051270275275275242242242248521521520521359359357359
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value83108198198198199249249249424974742417917917914814814813519719719619748474647
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo26.118.6100.039.839.839.874.778.678.673.61.469.814.614.634.465.065.065.061.161.161.154.337.937.937.737.813.413.313.013.3

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value83108198198198267317317317333172102127027527527514814814816619719719619748474647
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo26.118.6100.039.839.839.8100.0100.0100.093.610.188.841.341.5100.0100.0100.0100.061.161.161.166.937.937.937.737.813.413.313.013.3

us-gaap:UnsecuredDebt



Period End2020-03-312019-12-312019-06-302019-03-312018-12-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value24163003003002130040300300000094949482323323324324311311311311
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo73.981.460.260.260.26.489.911.258.758.50.00.00.00.038.938.938.933.162.162.162.362.286.686.787.086.7

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value32760461160415386307286242
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

udr:FixedRateDebt, us-gaap:SecuredDebt



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value11201202312
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear34.41.60.41.80.20.61.10.40.9

us-gaap:LongtermDebtType

us-gaap:SecuredDebt



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value112069700313212
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear34.41.615.143.90.28.110.60.40.9

us-gaap:UnsecuredDebt



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value2156039290415355275285240
Percentage of LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear65.698.484.956.199.891.989.499.699.1

dei:LegalEntity

us-gaap:NotesPayableRelatedPartiesCurrentAndNoncurrent

udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-31
Value635637623698690700273273273273273273273273273273273273888888888888888888888888888888837878
Percentage of NotesPayableRelatedPartiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, dei:LegalEntity

udr:NoteDueDecember2028, udr:UnitedDominionRealityLP



Period End2020-03-312019-12-312019-09-302019-06-302018-12-31
Value229230217291293
Percentage of NotesPayableRelatedPartiesCurrentAndNoncurrent36.136.234.841.841.9

us-gaap:NotesReceivableGross



Period End2020-03-312019-12-31
Value152153
Percentage of NotesReceivableGross100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

udr:NoteDueJanuary2023



Period End2020-03-312019-12-31
Value1716
Percentage of NotesReceivableGross11.410.7

us-gaap:NotesReceivableNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-31
Value1511533737364241403919181719191919161615151514184484836666666463391307777777
Percentage of NotesReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0