<?xml version="1.0" encoding="utf-8"?>
<!--XBRL document created with Toppan Merrill Bridge  11.4.0.1 -->
<!--Based on XBRL 2.1-->
<!--Created on: 7/27/2026 11:13:17 PM-->
<!--Modified on: 7/27/2026 11:13:17 PM-->
<xsd:schema targetNamespace="http://www.udr.com/20260630" attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:deprecated="http://www.xbrl.org/2009/role/deprecated" xmlns:us-roles="http://fasb.org/us-roles/2026" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:utr="http://www.xbrl.org/2009/utr" xmlns:us-gaap="http://fasb.org/us-gaap/2026" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:net="http://www.xbrl.org/2009/role/net" xmlns:dei="http://xbrl.sec.gov/dei/2026" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:attributeFormDefault="unqualified" xmlns:srt="http://fasb.org/srt/2026" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:udr="http://www.udr.com/20260630" xmlns:dtr="http://www.xbrl.org/2009/dtr" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:ecd="http://xbrl.sec.gov/ecd/2026" xmlns:ecd-sub="http://xbrl.sec.gov/ecd-sub/2026">
  <xsd:annotation>
    <xsd:appinfo>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedBalanceSheets" id="StatementConsolidatedBalanceSheets">
        <link:definition>995200100 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedStatementsOfOperations" id="StatementConsolidatedStatementsOfOperations">
        <link:definition>995200200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeLoss" id="StatementConsolidatedStatementsOfComprehensiveIncomeLoss">
        <link:definition>995200300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedStatementsOfCashFlows" id="StatementConsolidatedStatementsOfCashFlows">
        <link:definition>995200500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedStatementsOfCashFlowsCashReconciliation" id="StatementConsolidatedStatementsOfCashFlowsCashReconciliation">
        <link:definition>995200501 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS - CASH RECONCILIATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSignificantAccountingPoliciesNotesReceivablesDetails" id="DisclosureSignificantAccountingPoliciesNotesReceivablesDetails">
        <link:definition>99940202 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Notes Receivables (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureRealEstateOwnedSummarizesCarryingAmountsForOurRealEstateOwnedDetails" id="DisclosureRealEstateOwnedSummarizesCarryingAmountsForOurRealEstateOwnedDetails">
        <link:definition>99940301 - Disclosure - REAL ESTATE OWNED - Summarizes the carrying amounts for our real estate owned (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureJointVenturesAndPartnershipsAdditionalInformationDetails" id="DisclosureJointVenturesAndPartnershipsAdditionalInformationDetails">
        <link:definition>99940503 - Disclosure - JOINT VENTURES AND PARTNERSHIPS - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureLeasesLesseeFutureMinimumPaymentsDetails" id="DisclosureLeasesLesseeFutureMinimumPaymentsDetails">
        <link:definition>99940601 - Disclosure - LEASES - Lessee Future Minimum Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureLeasesLesseeExpensesDetails" id="DisclosureLeasesLesseeExpensesDetails">
        <link:definition>99940602 - Disclosure - LEASES - Lessee Expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureLeasesLesseeExpensesDefaultDetails" id="DisclosureLeasesLesseeExpensesDefaultDetails">
        <link:definition>40602 - Disclosure - LEASES - Lessee Expenses Default (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureLeasesLessorDetails" id="DisclosureLeasesLessorDetails">
        <link:definition>99940603 - Disclosure - LEASES - Lessor (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureLeasesLesseeFutureMinimumPaymentsDetailsCalc2" id="DisclosureLeasesLesseeFutureMinimumPaymentsDetailsCalc2">
        <link:definition>40604 - Disclosure - LEASES - Lessee Future Minimum Payments (Details)(Calc2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNetUnsecuredMaturitiesDetails" id="DisclosureSecuredAndUnsecuredDebtNetUnsecuredMaturitiesDetails">
        <link:definition>99940705 - Disclosure - SECURED AND UNSECURED DEBT, NET - Unsecured Maturities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNetUnsecuredMaturitiesDefaultDetails" id="DisclosureSecuredAndUnsecuredDebtNetUnsecuredMaturitiesDefaultDetails">
        <link:definition>40705 - Disclosure - SECURED AND UNSECURED DEBT, NET - Unsecured Maturities Default (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureIncomeLossPerShareDetails" id="DisclosureIncomeLossPerShareDetails">
        <link:definition>99940801 - Disclosure - INCOME/(LOSS) PER SHARE (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureFairValueOfDerivativesAndFinancialInstrumentsDetails" id="DisclosureFairValueOfDerivativesAndFinancialInstrumentsDetails">
        <link:definition>99941001 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivityOffsettingAssetsAndLiabilitiesDetails" id="DisclosureDerivativesAndHedgingActivityOffsettingAssetsAndLiabilitiesDetails">
        <link:definition>99941105 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Offsetting Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureReportableSegmentsDetails" id="DisclosureReportableSegmentsDetails">
        <link:definition>99941401 - Disclosure - REPORTABLE SEGMENTS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DocumentDocumentAndEntityInformation" id="DocumentDocumentAndEntityInformation">
        <link:definition>995200090 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedBalanceSheetsParenthetical" id="StatementConsolidatedBalanceSheetsParenthetical">
        <link:definition>995200105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedStatementOfChangesInEquity" id="StatementConsolidatedStatementOfChangesInEquity">
        <link:definition>995200400 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedStatementOfChangesInEquityParenthetical" id="StatementConsolidatedStatementOfChangesInEquityParenthetical">
        <link:definition>995200405 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/StatementConsolidatedStatementsOfCashFlowsParenthetical" id="StatementConsolidatedStatementsOfCashFlowsParenthetical">
        <link:definition>995200502 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureBasisOfPresentation" id="DisclosureBasisOfPresentation">
        <link:definition>995210101 - Disclosure - BASIS OF PRESENTATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSignificantAccountingPolicies" id="DisclosureSignificantAccountingPolicies">
        <link:definition>995210201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureRealEstateOwned" id="DisclosureRealEstateOwned">
        <link:definition>995210301 - Disclosure - REAL ESTATE OWNED</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureVariableInterestEntities" id="DisclosureVariableInterestEntities">
        <link:definition>995210401 - Disclosure - VARIABLE INTEREST ENTITIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureJointVenturesAndPartnerships" id="DisclosureJointVenturesAndPartnerships">
        <link:definition>995210501 - Disclosure - JOINT VENTURES AND PARTNERSHIPS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNet" id="DisclosureSecuredAndUnsecuredDebtNet">
        <link:definition>995210701 - Disclosure - SECURED AND UNSECURED DEBT, NET</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureIncomeLossPerShare" id="DisclosureIncomeLossPerShare">
        <link:definition>995210801 - Disclosure - INCOME/(LOSS) PER SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureNoncontrollingInterests" id="DisclosureNoncontrollingInterests">
        <link:definition>995210901 - Disclosure - NONCONTROLLING INTERESTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureFairValueOfDerivativesAndFinancialInstruments" id="DisclosureFairValueOfDerivativesAndFinancialInstruments">
        <link:definition>995211001 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivity" id="DisclosureDerivativesAndHedgingActivity">
        <link:definition>995211101 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureStockBasedCompensation" id="DisclosureStockBasedCompensation">
        <link:definition>995211201 - Disclosure - STOCK BASED COMPENSATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureCommitmentsAndContingencies" id="DisclosureCommitmentsAndContingencies">
        <link:definition>995211301 - Disclosure - COMMITMENTS AND CONTINGENCIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureReportableSegments" id="DisclosureReportableSegments">
        <link:definition>995211401 - Disclosure - REPORTABLE SEGMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSignificantAccountingPoliciesPolicies" id="DisclosureSignificantAccountingPoliciesPolicies">
        <link:definition>99920202 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSignificantAccountingPoliciesTables" id="DisclosureSignificantAccountingPoliciesTables">
        <link:definition>99930203 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureRealEstateOwnedTables" id="DisclosureRealEstateOwnedTables">
        <link:definition>99930303 - Disclosure - REAL ESTATE OWNED (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureJointVenturesAndPartnershipsTables" id="DisclosureJointVenturesAndPartnershipsTables">
        <link:definition>99930503 - Disclosure - JOINT VENTURES AND PARTNERSHIPS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNetTables" id="DisclosureSecuredAndUnsecuredDebtNetTables">
        <link:definition>99930703 - Disclosure - SECURED AND UNSECURED DEBT, NET (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureIncomeLossPerShareTables" id="DisclosureIncomeLossPerShareTables">
        <link:definition>99930803 - Disclosure - INCOME/(LOSS) PER SHARE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureNoncontrollingInterestsTables" id="DisclosureNoncontrollingInterestsTables">
        <link:definition>99930903 - Disclosure - NONCONTROLLING INTERESTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureFairValueOfDerivativesAndFinancialInstrumentsTables" id="DisclosureFairValueOfDerivativesAndFinancialInstrumentsTables">
        <link:definition>99931003 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivityTables" id="DisclosureDerivativesAndHedgingActivityTables">
        <link:definition>99931103 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureCommitmentsAndContingenciesTables" id="DisclosureCommitmentsAndContingenciesTables">
        <link:definition>99931303 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureReportableSegmentsTables" id="DisclosureReportableSegmentsTables">
        <link:definition>99931403 - Disclosure - REPORTABLE SEGMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureBasisOfPresentationDetails" id="DisclosureBasisOfPresentationDetails">
        <link:definition>99940101 - Disclosure - BASIS OF PRESENTATION (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSignificantAccountingPoliciesDetails" id="DisclosureSignificantAccountingPoliciesDetails">
        <link:definition>99940201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureRealEstateOwnedAdditionalInformationDetails" id="DisclosureRealEstateOwnedAdditionalInformationDetails">
        <link:definition>99940302 - Disclosure - REAL ESTATE OWNED - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureJointVenturesAndPartnershipsSummaryDetails" id="DisclosureJointVenturesAndPartnershipsSummaryDetails">
        <link:definition>99940501 - Disclosure - JOINT VENTURES AND PARTNERSHIPS - Summary (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureJointVenturesAndPartnershipsCommitmentsDetails" id="DisclosureJointVenturesAndPartnershipsCommitmentsDetails">
        <link:definition>99940502 - Disclosure - JOINT VENTURES AND PARTNERSHIPS - Commitments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureJointVenturesAndPartnershipsCommitmentsDefaultDetails" id="DisclosureJointVenturesAndPartnershipsCommitmentsDefaultDetails">
        <link:definition>40502 - Disclosure - JOINT VENTURES AND PARTNERSHIPS - Commitments Default (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNetSummaryDetails" id="DisclosureSecuredAndUnsecuredDebtNetSummaryDetails">
        <link:definition>99940701 - Disclosure - SECURED AND UNSECURED DEBT, NET - Summary (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNetCreditFacilitiesDetails" id="DisclosureSecuredAndUnsecuredDebtNetCreditFacilitiesDetails">
        <link:definition>99940702 - Disclosure - SECURED AND UNSECURED DEBT, NET - Credit Facilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNetShortTermDebtDetails" id="DisclosureSecuredAndUnsecuredDebtNetShortTermDebtDetails">
        <link:definition>99940703 - Disclosure - SECURED AND UNSECURED DEBT, NET - Short Term Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNetWorkingCapitalCreditFacilityDetails" id="DisclosureSecuredAndUnsecuredDebtNetWorkingCapitalCreditFacilityDetails">
        <link:definition>99940704 - Disclosure - SECURED AND UNSECURED DEBT, NET - Working Capital Credit Facility (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSecuredAndUnsecuredDebtNetNarrativeDetails" id="DisclosureSecuredAndUnsecuredDebtNetNarrativeDetails">
        <link:definition>99940706 - Disclosure - SECURED AND UNSECURED DEBT, NET - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureNoncontrollingInterestsDetails" id="DisclosureNoncontrollingInterestsDetails">
        <link:definition>99940901 - Disclosure - NONCONTROLLING INTERESTS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivityInterestRateDerivativesDetails" id="DisclosureDerivativesAndHedgingActivityInterestRateDerivativesDetails">
        <link:definition>99941101 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Interest Rate Derivatives (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivityUndesignatedInterestRateDerivativesDetails" id="DisclosureDerivativesAndHedgingActivityUndesignatedInterestRateDerivativesDetails">
        <link:definition>99941102 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Undesignated Interest Rate Derivatives (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivityUndesignatedInterestRateDerivativesDefaultDetails" id="DisclosureDerivativesAndHedgingActivityUndesignatedInterestRateDerivativesDefaultDetails">
        <link:definition>41102 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Undesignated Interest Rate Derivatives Default (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivityFairValueDetails" id="DisclosureDerivativesAndHedgingActivityFairValueDetails">
        <link:definition>99941103 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Fair Value (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivityFairValueDefaultDetails" id="DisclosureDerivativesAndHedgingActivityFairValueDefaultDetails">
        <link:definition>41103 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Fair Value Default (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureDerivativesAndHedgingActivityEffectivenessDetails" id="DisclosureDerivativesAndHedgingActivityEffectivenessDetails">
        <link:definition>99941104 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Effectiveness (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureStockBasedCompensationDetails" id="DisclosureStockBasedCompensationDetails">
        <link:definition>99941201 - Disclosure - STOCK BASED COMPENSATION (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureStockBasedCompensationDefaultDetails" id="DisclosureStockBasedCompensationDefaultDetails">
        <link:definition>41201 - Disclosure - STOCK BASED COMPENSATION Default (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureCommitmentsAndContingenciesDetails" id="DisclosureCommitmentsAndContingenciesDetails">
        <link:definition>99941301 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureLeases" id="DisclosureLeases">
        <link:definition>995210601 - Disclosure - LEASES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureLeasesTables" id="DisclosureLeasesTables">
        <link:definition>99930603 - Disclosure - LEASES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.udr.com/role/DisclosureSignificantAccountingPoliciesScheduleOfAllowanceForCreditLossesDetails" id="DisclosureSignificantAccountingPoliciesScheduleOfAllowanceForCreditLossesDetails">
        <link:definition>99940203 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Schedule of allowance for credit losses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:href="udr-20260630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="udr-20260630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="udr-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="udr-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:roleType roleURI="http://www.udr.com/role/DisclosureStandardAndCustomAxisDomainDefaults" id="DisclosureStandardAndCustomAxisDomainDefaults">
        <link:definition>99900 - Disclosure - Standard And Custom Axis Domain Defaults</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:import namespace="https://xbrl.org/2023/calculation-1.1" schemaLocation="https://www.xbrl.org/2023/calculation-1.1.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-roles-2026.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd" />
  <xsd:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/ecd-sub/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-sub-2026.xsd" />
  <xsd:element name="AccountingPoliciesLineItems" id="udr_AccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccountingPoliciesTable" id="udr_AccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AggregateCommitmentOnNoteReceivable" id="udr_AggregateCommitmentOnNoteReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ApartmentHomesSold" id="udr_ApartmentHomesSold" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CombinedSummaryOfBalanceSheetsRelatingToUnconsolidatedJointVenturesTableTextBlock" id="udr_CombinedSummaryOfBalanceSheetsRelatingToUnconsolidatedJointVenturesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialPaperMaximumBorrowingAmount" id="udr_CommercialPaperMaximumBorrowingAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CommunityThresholdPeriodAboveOccupancyThreshold" id="udr_CommunityThresholdPeriodAboveOccupancyThreshold" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConditionForCommunityConsideredToHaveStabilizedOccupancy" id="udr_ConditionForCommunityConsideredToHaveStabilizedOccupancy" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CostIncurredToDate" id="udr_CostIncurredToDate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DebtAssumedAsPartOfAcquisitionMember" id="udr_DebtAssumedAsPartOfAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DepreciablePropertyHeldAndUsedAbstract" id="udr_DepreciablePropertyHeldAndUsedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DerivativesAndHedgingActivityTextualAbstract" id="udr_DerivativesAndHedgingActivityTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DetailsOfAssetsOfCompanysReportableSegmentsAbstract" id="udr_DetailsOfAssetsOfCompanysReportableSegmentsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentSummarizedFinancialInformationBalanceSheetsAbstract" id="udr_EquityMethodInvestmentSummarizedFinancialInformationBalanceSheetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueAssetsMeasuredOnRecurringBasisAbstract" id="udr_FairValueAssetsMeasuredOnRecurringBasisAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FixedRateDebtMember" id="udr_FixedRateDebtMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GeneralPartnersCapitalAccountUnitsOwnedPercentage" id="udr_GeneralPartnersCapitalAccountUnitsOwnedPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations" id="udr_IncomeTaxExpenseBenefitOfReitSubsidiaryNetIncludingDiscontinuedOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="JointVenturesAbstract" id="udr_JointVenturesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LimitedPartnersCapitalAccountUnitsOutstandingPercentage" id="udr_LimitedPartnersCapitalAccountUnitsOutstandingPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="LongTermIncentivePlanOperatingPartnershipUnitVestingValue" id="udr_LongTermIncentivePlanOperatingPartnershipUnitVestingValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="MaturitiesOfUnsecuredDebtAbstract" id="udr_MaturitiesOfUnsecuredDebtAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonAffiliatedPartnersMember" id="udr_NonAffiliatedPartnersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonMatureCommunitiesOtherMember" id="udr_NonMatureCommunitiesOtherMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NoteReceivableInterestRate" id="udr_NoteReceivableInterestRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfApartmentHomesAcquired" id="udr_NumberOfApartmentHomesAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfApartmentHomesOwnedAndConsolidatedByCompany" id="udr_NumberOfApartmentHomesOwnedAndConsolidatedByCompany" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfCommunitiesEncumbered" id="udr_NumberOfCommunitiesEncumbered" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfMarketsOperatingWithin" id="udr_NumberOfMarketsOperatingWithin" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="OperatingCommunityMember" id="udr_OperatingCommunityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" id="udr_OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OtherCostAndExpenseOperatingIncludingDiscontinuedOperations" id="udr_OtherCostAndExpenseOperatingIncludingDiscontinuedOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations" id="udr_OtherGeneralAndAdministrativeExpenseIncludingDiscontinuedOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OwnershipPercentageAxis" id="udr_OwnershipPercentageAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OwnershipPercentageDomain" id="udr_OwnershipPercentageDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ParticipatingLoanInterestRateStatedPercentage" id="udr_ParticipatingLoanInterestRateStatedPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RealEstateHeldForSaleNetofDepreciation" id="udr_RealEstateHeldForSaleNetofDepreciation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RealEstateOwnedGross" id="udr_RealEstateOwnedGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RealEstateUnderDevelopmentAbstract" id="udr_RealEstateUnderDevelopmentAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateUnderDevelopmentAccumulatedDepreciation" id="udr_RealEstateUnderDevelopmentAccumulatedDepreciation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="RealEstatesOwnedAccumulatedDepreciation" id="udr_RealEstatesOwnedAccumulatedDepreciation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReconciliationItemToConsolidatedAbstract" id="udr_ReconciliationItemToConsolidatedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReportableApartmentHomeSegmentAssetsAbstract" id="udr_ReportableApartmentHomeSegmentAssetsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReportableSegmentTextualAbstract" id="udr_ReportableSegmentTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SameCommunitiesMember" id="udr_SameCommunitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SameCommunitiesMidAtlanticRegionMember" id="udr_SameCommunitiesMidAtlanticRegionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SameCommunitiesNortheastRegionMember" id="udr_SameCommunitiesNortheastRegionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SameCommunitiesSoutheasternRegionMember" id="udr_SameCommunitiesSoutheasternRegionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SameCommunitiesSouthwesternRegionMember" id="udr_SameCommunitiesSouthwesternRegionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SameCommunitiesWesternRegionMember" id="udr_SameCommunitiesWesternRegionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SameStoreCommunities" id="udr_SameStoreCommunities" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebtEncumbersRealEstateOwnedPercent" id="udr_SecuredDebtEncumbersRealEstateOwnedPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="SecuredDebtIncludingDebtOnRealEstateHeldForSale" id="udr_SecuredDebtIncludingDebtOnRealEstateHeldForSale" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="SecuredDebtTextualAbstract" id="udr_SecuredDebtTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SecuredDebtUnencumberedRealEstateOwnedPercent" id="udr_SecuredDebtUnencumberedRealEstateOwnedPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="SegmentReportingInformationNetOperatingIncome" id="udr_SegmentReportingInformationNetOperatingIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization" id="udr_SegmentReportingReconcilingItemsCostOfServicesDepreciationAndAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SegmentReportingReconcilingItemsOwnedPropertyManagementCosts" id="udr_SegmentReportingReconcilingItemsOwnedPropertyManagementCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SignificantAccountingPoliciesTextualAbstract" id="udr_SignificantAccountingPoliciesTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockBasedCompensationTextualAbstract" id="udr_StockBasedCompensationTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SummarizedIncomeStatementRelatingToUnconsolidatedJointVenturesTableTextBlock" id="udr_SummarizedIncomeStatementRelatingToUnconsolidatedJointVenturesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SummaryOfCarryingAmountsForRealEstateOwnedAbstract" id="udr_SummaryOfCarryingAmountsForRealEstateOwnedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SummaryOfRentalIncomeAndNoiForReportableSegmentsAndReconciliationOfNoiToLossFromContinuingOperationsAbstract" id="udr_SummaryOfRentalIncomeAndNoiForReportableSegmentsAndReconciliationOfNoiToLossFromContinuingOperationsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SummaryOfShortTermBankBorrowingsUnderBankCreditFacilityAbstract" id="udr_SummaryOfShortTermBankBorrowingsUnderBankCreditFacilityAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TaxExemptNotesPayableMember" id="udr_TaxExemptNotesPayableMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TaxExemptSecuredNotesPayableMember" id="udr_TaxExemptSecuredNotesPayableMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TotalCommunitiesMember" id="udr_TotalCommunitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UDRLighthouseDownREITL.P.Member" id="udr_UDRLighthouseDownREITL.P.Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnconsolidatedJointVenturesMember" id="udr_UnconsolidatedJointVenturesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnitedDominionRealityLPMember" id="udr_UnitedDominionRealityLPMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VariableRateDebtMember" id="udr_VariableRateDebtMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WhollyOwnedPropertiesUnderDevelopmentMember" id="udr_WhollyOwnedPropertiesUnderDevelopmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidationAndBasisOfPresentationTable" id="udr_ConsolidationAndBasisOfPresentationTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidationAndBasisOfPresentationLineItems" id="udr_ConsolidationAndBasisOfPresentationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidationAndBasisOfPresentationTextualAbstract" id="udr_ConsolidationAndBasisOfPresentationTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RedeemableNoncontrollingInterestsTemporaryEquityRollForwardAbstract" id="udr_RedeemableNoncontrollingInterestsTemporaryEquityRollForwardAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GroundLeasesMember" id="udr_GroundLeasesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost" id="udr_DebtInstrumentUnamortizedFairMarketValueAdjustmentDiscountPremiumDeferredFinancingCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="A3.50MediumTermNoteDueJuly2027Member" id="udr_A3.50MediumTermNoteDueJuly2027Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentCommittedInvestment" id="udr_EquityMethodInvestmentCommittedInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="A3.50MediumTermNotesDueJanuary2028Member" id="udr_A3.50MediumTermNotesDueJanuary2028Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpirationPeriodAxis" id="udr_ExpirationPeriodAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpirationPeriodDomain" id="udr_ExpirationPeriodDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PreferredEquityInvestmentsMember" id="udr_PreferredEquityInvestmentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingPartnershipUnitsIssued" id="udr_OperatingPartnershipUnitsIssued" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest" id="udr_DevelopmentCostsExcludingDirectCostsAndCapitalizedInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="MinimumHoldingPeriodOfRedeemableUnitsForRedemption" id="udr_MinimumHoldingPeriodOfRedeemableUnitsForRedemption" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnsecuredRevolvingCreditFacilityDueTwoThousandTwentyThreeMember" id="udr_UnsecuredRevolvingCreditFacilityDueTwoThousandTwentyThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TermLoanFacilityDueSeptember2023Member" id="udr_TermLoanFacilityDueSeptember2023Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PropertyManagementCostsOperating" id="udr_PropertyManagementCostsOperating" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FourPointFourZeroPercentMediumTermNoteDueJanuaryTwoThousandTwentyNineMember" id="udr_FourPointFourZeroPercentMediumTermNoteDueJanuaryTwoThousandTwentyNineMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateTransactionsRevenueRecognitionPolicyPolicyTextBlock" id="udr_RealEstateTransactionsRevenueRecognitionPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ManagementAndOtherFeesMember" id="udr_ManagementAndOtherFeesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TotalJointVenturesAndPartnershipsMember" id="udr_TotalJointVenturesAndPartnershipsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TransfersBetweenLevelsFairValueHierarchy" id="udr_TransfersBetweenLevelsFairValueHierarchy" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeaseOtherIncome" id="udr_OperatingLeaseOtherIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LeaseDisclosureTextBlock" id="udr_LeaseDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCommunitiesSubjectToGroundLeases" id="udr_NumberOfCommunitiesSubjectToGroundLeases" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ApartmentHomesMember" id="udr_ApartmentHomesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RetailAndCommercialSpaceMember" id="udr_RetailAndCommercialSpaceMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AtMarketOfferingMember" id="udr_AtMarketOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LeasePracticalExpedientLessorSingleLeaseComponentTrueFalse" id="udr_LeasePracticalExpedientLessorSingleLeaseComponentTrueFalse" type="xbrli:booleanItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfRevenueTotalLeaseRevenue" id="udr_PercentageOfRevenueTotalLeaseRevenue" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030Member" id="udr_SeniorUnsecuredMediumTermNotes3.2PercentDueJanuary2030Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeaseLiabilitiesAmortization" id="udr_OperatingLeaseLiabilitiesAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="MediumTerm3.00PercentageNoteDueAugust2031Member" id="udr_MediumTerm3.00PercentageNoteDueAugust2031Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForwardSalesAgreementsPolicyTextBlock" id="udr_ForwardSalesAgreementsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ThreePointOneZeroPercentSeniorUnsecuredNotesDue2034Member" id="udr_ThreePointOneZeroPercentSeniorUnsecuredNotesDue2034Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateHeldForInvestmentNetExcludingRealEstateUnderDevelopmentOrHeldForDisposition" id="udr_RealEstateHeldForInvestmentNetExcludingRealEstateUnderDevelopmentOrHeldForDisposition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="CasualtyRelatedRecoveriesChargesNet" id="udr_CasualtyRelatedRecoveriesChargesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ReturnOnInvestmentInEquityMethodInvestments" id="udr_ReturnOnInvestmentInEquityMethodInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InvestmentBuildingAndBuildingImprovementsAndFurnitureFixturesAndEquipment" id="udr_InvestmentBuildingAndBuildingImprovementsAndFurnitureFixturesAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfCommunitiesAcquired" id="udr_NumberOfCommunitiesAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeFromParticipatingLoan" id="udr_IncomeFromParticipatingLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="A2.95MediumTermNoteDueSeptember2026Member" id="udr_A2.95MediumTermNoteDueSeptember2026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermDebtMaturitiesRepaymentOfPrincipleInYearSix" id="udr_LongTermDebtMaturitiesRepaymentOfPrincipleInYearSix" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LongTermDebtMaturitiesRepaymentOfPrincipleInYearSeven" id="udr_LongTermDebtMaturitiesRepaymentOfPrincipleInYearSeven" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LongTermDebtMaturitiesRepaymentOfPrincipleInYearEight" id="udr_LongTermDebtMaturitiesRepaymentOfPrincipleInYearEight" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfExtensionsOfLoan" id="udr_NumberOfExtensionsOfLoan" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ExtensionPeriodOfOptionOnLoan" id="udr_ExtensionPeriodOfOptionOnLoan" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PortionOfMediumTermNoteSubjectToInterestRateSwaps" id="udr_PortionOfMediumTermNoteSubjectToInterestRateSwaps" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="InterestAndOtherIncomeIncludingDiscontinuedOperations" id="udr_InterestAndOtherIncomeIncludingDiscontinuedOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NoncontrollingInterestTypeAxis" id="udr_NoncontrollingInterestTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NoncontrollingInterestTypeDomain" id="udr_NoncontrollingInterestTypeDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCommunitiesSold" id="udr_NumberOfCommunitiesSold" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MediumTerm3.10PercentageNoteDueNovember2034Member" id="udr_MediumTerm3.10PercentageNoteDueNovember2034Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfApartmentHomesWithOwnershipInterestThroughPreferredEquityInvestments" id="udr_NumberOfApartmentHomesWithOwnershipInterestThroughPreferredEquityInvestments" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockCompensationPlanAndUnvestedRestrictedStockMember" id="udr_StockCompensationPlanAndUnvestedRestrictedStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="JointVentureNumberOfCompletedOrToBeCompletedApartmentHomesInOperatingCommunities" id="udr_JointVentureNumberOfCompletedOrToBeCompletedApartmentHomesInOperatingCommunities" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BuildingImprovementsFurnitureFixturesAndEquipmentMember" id="udr_BuildingImprovementsFurnitureFixturesAndEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MarketPropertiesLlcThirteenthMember" id="udr_MarketPropertiesLlcThirteenthMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TwoPointOneZeroPercentMediumTermNoteDueAugust12032Member" id="udr_TwoPointOneZeroPercentMediumTermNoteDueAugust12032Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestRateSwapAndCapsMember" id="udr_InterestRateSwapAndCapsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LesseeOperatingLeaseLiabilityToBePaidInYearFiveAndAfterYearFive" id="udr_LesseeOperatingLeaseLiabilityToBePaidInYearFiveAndAfterYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LessorOperatingLeasePaymentToBeReceivedInFifthYearAndAfterYearFive" id="udr_LessorOperatingLeasePaymentToBeReceivedInFifthYearAndAfterYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AccumulatedDepreciationOfRealEstateHeldForSale" id="udr_AccumulatedDepreciationOfRealEstateHeldForSale" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NoncontrollingsInterestTypeAxis" id="udr_NoncontrollingsInterestTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NoncontrollingsInterestDomain" id="udr_NoncontrollingsInterestDomain" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MediumTerm1.90PercentageNoteDueMarch2033Member" id="udr_MediumTerm1.90PercentageNoteDueMarch2033Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorUnsecuredMediumTerm2.10PercentNoteDue2033Member" id="udr_SeniorUnsecuredMediumTerm2.10PercentNoteDue2033Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityAdjustedMaximumBorrowingCapacity" id="udr_LineOfCreditFacilityAdjustedMaximumBorrowingCapacity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="UnsecuredWorkingCapitalCreditFacilityMember" id="udr_UnsecuredWorkingCapitalCreditFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingPartnershipUnitsIssuedForRealEstateNet" id="udr_OperatingPartnershipUnitsIssuedForRealEstateNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentBasisSpreadOnVariableRateSubtracted" id="udr_DebtInstrumentBasisSpreadOnVariableRateSubtracted" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NoteDueDecember2026Member" id="udr_NoteDueDecember2026Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NoteDueJune2027Member" id="udr_NoteDueJune2027Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HomeCommunityRiversideCaliforniaMember" id="udr_HomeCommunityRiversideCaliforniaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HomeCommunityMenifeeCaliforniaMember" id="udr_HomeCommunityMenifeeCaliforniaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NotesReceivableExtensionsOptionsTerm" id="udr_NotesReceivableExtensionsOptionsTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NotesReceivableNumberOfExtensionOptions" id="udr_NotesReceivableNumberOfExtensionOptions" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="UnconsolidatedJointVentureUdrMetLifeMember" id="udr_UnconsolidatedJointVentureUdrMetLifeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NumberOfInvestmentsWhichReceiveVariablePercentage" id="udr_NumberOfInvestmentsWhichReceiveVariablePercentage" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PropertyManagementCostsOperatingPercentage" id="udr_PropertyManagementCostsOperatingPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="UnconsolidatedJointVentureUdrLasalleMember" id="udr_UnconsolidatedJointVentureUdrLasalleMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RealEstateOwnedIncreaseFromAcquisition" id="udr_RealEstateOwnedIncreaseFromAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="RealEstateInPlaceLeaseIntangibles" id="udr_RealEstateInPlaceLeaseIntangibles" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="RealEstateTechnologyAndSustainabilityInvestmentsMember" id="udr_RealEstateTechnologyAndSustainabilityInvestmentsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NoteDueSeptember2027Member" id="udr_NoteDueSeptember2027Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HomeCommunitySantaMonicaCaliforniaMember" id="udr_HomeCommunitySantaMonicaCaliforniaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="MediumTerm5.125PercentageNoteDueSeptember2034Member" id="udr_MediumTerm5.125PercentageNoteDueSeptember2034Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtAndPreferredEquityProgramCommunityMember" id="udr_DebtAndPreferredEquityProgramCommunityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NumberOfPreferredEquityInvestmentsAgreementsRedeemed" id="udr_NumberOfPreferredEquityInvestmentsAgreementsRedeemed" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NotesReceivableOriginalAmount" id="udr_NotesReceivableOriginalAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="UtilitiesExpense" id="udr_UtilitiesExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="SegmentReportingInformationTotalSegmentAndConsolidatedOperatingExpenses" id="udr_SegmentReportingInformationTotalSegmentAndConsolidatedOperatingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="NotesReceivablesSettledInExchangeForRealEstateOwned" id="udr_NotesReceivablesSettledInExchangeForRealEstateOwned" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ConversionOfNotesReceivableToEquitySecuritiesUponSaleOfBorrowerAssetsToUnaffiliatedThirdParty" id="udr_ConversionOfNotesReceivableToEquitySecuritiesUponSaleOfBorrowerAssetsToUnaffiliatedThirdParty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TermLoanFacilityDueJanuary2029Member" id="udr_TermLoanFacilityDueJanuary2029Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="UnsecuredRevolvingCreditFacilityDueAugust2028Member" id="udr_UnsecuredRevolvingCreditFacilityDueAugust2028Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HomeOperatingCommunity232PortlandOregonMember" id="udr_HomeOperatingCommunity232PortlandOregonMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="FourOperatingCommunitiesInVariousMarketsMember" id="udr_FourOperatingCommunitiesInVariousMarketsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RepaymentsOfJointVenturesLoan" id="udr_RepaymentsOfJointVenturesLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="RealEstateSaleProceedsHeldByQualifiedIntermediary" id="udr_RealEstateSaleProceedsHeldByQualifiedIntermediary" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="NoteDueMay2031Member" id="udr_NoteDueMay2031Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HomeOperatingApartmentCommunity286PortlandOregonMember" id="udr_HomeOperatingApartmentCommunity286PortlandOregonMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="OperatingCommunityNashvilleTennesseeMember" id="udr_OperatingCommunityNashvilleTennesseeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="UnconsolidatedJointVentureUdrCarmelPartnersMember" id="udr_UnconsolidatedJointVentureUdrCarmelPartnersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HomeOperatingCommunity66SantaMonicaCaliforniaMember" id="udr_HomeOperatingCommunity66SantaMonicaCaliforniaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HomeOperatingCommunity286PortlandOregonMember" id="udr_HomeOperatingCommunity286PortlandOregonMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="HomeOperatingCommunity710NewYorkMember" id="udr_HomeOperatingCommunity710NewYorkMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="EquityInvestmentsSettledUponLiquidation" id="udr_EquityInvestmentsSettledUponLiquidation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="GainLossFromConsolidationAndRemeasurementOfUnconsolidatedEntities" id="udr_GainLossFromConsolidationAndRemeasurementOfUnconsolidatedEntities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="NumberOfInvestmentsRemeasuredToLiquidationValue" id="udr_NumberOfInvestmentsRemeasuredToLiquidationValue" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NoncontrollingInterestIncreaseFromContribution" id="udr_NoncontrollingInterestIncreaseFromContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="PreferredEquityInvestmentSettledInExchangeForAcquisitionOfRealEstateOwned" id="udr_PreferredEquityInvestmentSettledInExchangeForAcquisitionOfRealEstateOwned" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="HomeOperatingCommunity235InSeattleWaMember" id="udr_HomeOperatingCommunity235InSeattleWaMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="ApartmentHomesAgreedToBeSold" id="udr_ApartmentHomesAgreedToBeSold" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="AggregateSalePriceForApartmentsToBeSold" id="udr_AggregateSalePriceForApartmentsToBeSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="NumberOfCommunitiesAgreedToSell" id="udr_NumberOfCommunitiesAgreedToSell" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="HomeOperatingCommunity573Member" id="udr_HomeOperatingCommunity573Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="NumberOfUnitsTransferred" id="udr_NumberOfUnitsTransferred" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
</xsd:schema>
