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  <xsd:element name="AcreageOfRealEstateProperty" id="snh_AcreageOfRealEstateProperty" type="num:areaItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="CurrentFederalAndStateTaxExpenseBenefit" id="snh_CurrentFederalAndStateTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
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  <xsd:element name="NumberOfPropertiesInLongLivedAssetsHeldForUse" id="snh_NumberOfPropertiesInLongLivedAssetsHeldForUse" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
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  <xsd:element name="MissouriNewYorkAndSouthCarolinaMember" id="snh_MissouriNewYorkAndSouthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ColoradoIdahoAndWashingtonMember" id="snh_ColoradoIdahoAndWashingtonMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="RehabilitationHospitalsMember" id="snh_RehabilitationHospitalsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="MinimumCombinationLeasesNumber" id="snh_MinimumCombinationLeasesNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="NumberOfIndependentTrusteesAlsoServingAsIndependentTrusteesOfRelatedParty" id="snh_NumberOfIndependentTrusteesAlsoServingAsIndependentTrusteesOfRelatedParty" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
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  <xsd:element name="AverageLeaseTerm" id="snh_AverageLeaseTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="SeniorUnsecuredNotes6.75PercentDue2021Member" id="snh_SeniorUnsecuredNotes6.75PercentDue2021Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorUnsecuredNotes5.625PercentDue2042Member" id="snh_SeniorUnsecuredNotes5.625PercentDue2042Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="MortgagesClosedIn2009Member" id="snh_MortgagesClosedIn2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateUnitsTypeDomain" id="snh_RealEstateUnitsTypeDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateUnitsByTypeAxis" id="snh_RealEstateUnitsByTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfBusinessDaysBeforeWhichNoticeRequiredForTerminationOfPropertyManagementAgreementUponChangeInControl" id="snh_NumberOfBusinessDaysBeforeWhichNoticeRequiredForTerminationOfPropertyManagementAgreementUponChangeInControl" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IndependentLivingUnitsMember" id="snh_IndependentLivingUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AlzheimersCareUnitsMember" id="snh_AlzheimersCareUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LivingUnitsMember" id="snh_LivingUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentOwnershipPercentage" id="snh_InvestmentOwnershipPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfRealEstatePropertiesImpaired" id="snh_NumberOfRealEstatePropertiesImpaired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentOwnershipPercentageHeld" id="snh_EquityMethodInvestmentOwnershipPercentageHeld" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="EquityMethodInvestmentAdditionalInvestment" id="snh_EquityMethodInvestmentAdditionalInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InvestmentBuildingImprovementsCIPAndInvestments" id="snh_InvestmentBuildingImprovementsCIPAndInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ScheduleOfSummaryFinancialInformationOfMajorCustomerTableTextBlock" id="snh_ScheduleOfSummaryFinancialInformationOfMajorCustomerTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesOfLessorLesseeDomain" id="snh_OperatingLeasesOfLessorLesseeDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LeasesAcquiredInPlaceAboveMarketMember" id="snh_LeasesAcquiredInPlaceAboveMarketMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LeasesAcquiredInPlaceBelowMarketMember" id="snh_LeasesAcquiredInPlaceBelowMarketMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseOperatingLeasesAnnualRent" id="snh_IncreaseDecreaseOperatingLeasesAnnualRent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RealEstateImprovementsByLesseePurchased" id="snh_RealEstateImprovementsByLesseePurchased" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesAnnualRent" id="snh_OperatingLeasesAnnualRent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInCapitalizedAboveAndBelowMarketLeasesRentalIncome" id="snh_IncreaseDecreaseInCapitalizedAboveAndBelowMarketLeasesRentalIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RealEstateAggregatePurchasePriceOfPropertiesToBeAcquired" id="snh_RealEstateAggregatePurchasePriceOfPropertiesToBeAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RentsReceivable" id="snh_RentsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RealEstatePropertiesAcquiredIntangibleLeaseAssets" id="snh_RealEstatePropertiesAcquiredIntangibleLeaseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RealEstatePropertiesAcquiredIntangibleLeaseLiabilities" id="snh_RealEstatePropertiesAcquiredIntangibleLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NoncashOrPartNoncashAcquisitionPremiumOnDebtAssumed1" id="snh_NoncashOrPartNoncashAcquisitionPremiumOnDebtAssumed1" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RealEstatePropertiesAcquiredPropertyPlantAndEquipment" id="snh_RealEstatePropertiesAcquiredPropertyPlantAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfUnitsInRealEstatePropertyHeldForSale" id="snh_NumberOfUnitsInRealEstatePropertyHeldForSale" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DeferredDebtIssuanceCosts" id="snh_DeferredDebtIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="SeniorNotesFairValueInExcessOfBookValue" id="snh_SeniorNotesFairValueInExcessOfBookValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NumberOfRealEstatePropertiesCollateralized" id="snh_NumberOfRealEstatePropertiesCollateralized" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DebtInstrumentNumberOfMortgagesClosed" id="snh_DebtInstrumentNumberOfMortgagesClosed" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentNumberOfMortgages" id="snh_DebtInstrumentNumberOfMortgages" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CumulativeImpairmentOfLongLivedAssetsToBeDisposed" id="snh_CumulativeImpairmentOfLongLivedAssetsToBeDisposed" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AllOtherSegmentsAndCorporateMember" id="snh_AllOtherSegmentsAndCorporateMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidatedMember" id="snh_ConsolidatedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorLivingAndOtherRevenue" id="snh_SeniorLivingAndOtherRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ResidentsFeesAndServicesRevenue" id="snh_ResidentsFeesAndServicesRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="MedicalOfficeBuildingOperatingExpenses" id="snh_MedicalOfficeBuildingOperatingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SeniorLivingOperatingExpenses" id="snh_SeniorLivingOperatingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeShareInOtherComprehensiveIncomeOfInvesteeNetOfTaxPeriodIncreaseDecrease" id="snh_OtherComprehensiveIncomeShareInOtherComprehensiveIncomeOfInvesteeNetOfTaxPeriodIncreaseDecrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityPeriodForWhichFacilityCanBeExtended" id="snh_LineOfCreditFacilityPeriodForWhichFacilityCanBeExtended" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentExtensionTermOfMaturityTerm" id="snh_DebtInstrumentExtensionTermOfMaturityTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentSharesOfCommonStockAcquiredInPublicOffering" id="snh_InvestmentSharesOfCommonStockAcquiredInPublicOffering" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentAggregatePurchasePrice" id="snh_InvestmentAggregatePurchasePrice" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InvestmentSharesOfCommonStockAcquiredInUnderwrittenPublicOffering" id="snh_InvestmentSharesOfCommonStockAcquiredInUnderwrittenPublicOffering" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentNetPurchasePrice" id="snh_InvestmentNetPurchasePrice" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfSharesToBeIssuedInPublicOffering" id="snh_NumberOfSharesToBeIssuedInPublicOffering" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PriorLineOfCreditMember" id="snh_PriorLineOfCreditMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentOwnedPercentageOfTotalSharesOutstanding" id="snh_InvestmentOwnedPercentageOfTotalSharesOutstanding" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MortgageLoansOnRealEstateBorrowerAxis" id="snh_MortgageLoansOnRealEstateBorrowerAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageLoansOnRealEstateBorrowerNameDomain" id="snh_MortgageLoansOnRealEstateBorrowerNameDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageLoansOnRealEstatePropertyLocationDomain" id="snh_MortgageLoansOnRealEstatePropertyLocationDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IndianaMember" id="snh_IndianaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NorthCarolinaMember" id="snh_NorthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageLoansOnRealEstateDescriptionLocationOfPropertyAxis" id="snh_MortgageLoansOnRealEstateDescriptionLocationOfPropertyAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPropertiesAgreedToBeAcquiredByBorrower" id="snh_NumberOfPropertiesAgreedToBeAcquiredByBorrower" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPropertiesAgreedToBeSold" id="snh_NumberOfPropertiesAgreedToBeSold" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MortgageLoansOnRealEstateAmountAvailableForBorrowing" id="snh_MortgageLoansOnRealEstateAmountAvailableForBorrowing" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="MortgageLoansOnRealEstateNumberOfPropertiesAcquiredByBorrowerMortgaged" id="snh_MortgageLoansOnRealEstateNumberOfPropertiesAcquiredByBorrowerMortgaged" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MortgageLoansOnRealEstateNumberOfPropertiesOwnedByBorrowerMortgaged" id="snh_MortgageLoansOnRealEstateNumberOfPropertiesOwnedByBorrowerMortgaged" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MortgageLoansOnRealEstateNumberOfUnitsToBeMortgaged" id="snh_MortgageLoansOnRealEstateNumberOfUnitsToBeMortgaged" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfManagingTrusteesAlsoServingAsManagingTrusteeOfRelatedParty" id="snh_NumberOfManagingTrusteesAlsoServingAsManagingTrusteeOfRelatedParty" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfManagingTrusteesAlsoServingAsPresidentOfRelatedParty" id="snh_NumberOfManagingTrusteesAlsoServingAsPresidentOfRelatedParty" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MedicalOfficeBuildingRevenue" id="snh_MedicalOfficeBuildingRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SeniorUnsecuredNotes8.625PercentMember" id="snh_SeniorUnsecuredNotes8.625PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorUnsecuredNotes6.4PercentDue2019Member" id="snh_SeniorUnsecuredNotes6.4PercentDue2019Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Mortgages6.65PercentMember" id="snh_Mortgages6.65PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProFormaInformationDisclosureAbstract" id="snh_ProFormaInformationDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProFormaInformationDisclosureTextBlock" id="snh_ProFormaInformationDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BasisOfPresentationPolicyTextBlock" id="snh_BasisOfPresentationPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EarningsAndDividendPerShareAbstract" id="snh_EarningsAndDividendPerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateInvestmentPropertyAtCostMember" id="snh_RealEstateInvestmentPropertyAtCostMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateRevenueNetMember" id="snh_RealEstateRevenueNetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OwnershipPercentageHeldInSubsidiary" id="snh_OwnershipPercentageHeldInSubsidiary" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="PersonalPropertyMember" id="snh_PersonalPropertyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashAndCashEquivalentsMaximumMaturityPeriod" id="snh_CashAndCashEquivalentsMaximumMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PeriodOfExtensionOfLineOfCreditFacility" id="snh_PeriodOfExtensionOfLineOfCreditFacility" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredFinanceCostsWeightedAverageAmortizationPeriod" id="snh_DeferredFinanceCostsWeightedAverageAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredFinanceCostsFutureAmortizationExpenseAbstract" id="snh_DeferredFinanceCostsFutureAmortizationExpenseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredFinanceCostsFutureAmortizationExpenseYearOne" id="snh_DeferredFinanceCostsFutureAmortizationExpenseYearOne" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredFinanceCostsFutureAmortizationExpenseYearTwo" id="snh_DeferredFinanceCostsFutureAmortizationExpenseYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredFinanceCostsFutureAmortizationExpenseYearThree" id="snh_DeferredFinanceCostsFutureAmortizationExpenseYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredFinanceCostsFutureAmortizationExpenseYearFour" id="snh_DeferredFinanceCostsFutureAmortizationExpenseYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredFinanceCostsFutureAmortizationExpenseYearFive" id="snh_DeferredFinanceCostsFutureAmortizationExpenseYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DeferredFinanceCostsFutureAmortizationExpenseAfterYearFive" id="snh_DeferredFinanceCostsFutureAmortizationExpenseAfterYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SignificantAcquisitionsAndDisposalsProFormaRevenue" id="snh_SignificantAcquisitionsAndDisposalsProFormaRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SignificantAcquisitionsAndDisposalsProFormaInformationAbstract" id="snh_SignificantAcquisitionsAndDisposalsProFormaInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SignificantAcquisitionsAndDisposalsProFormaEarningsPerShareAbstract" id="snh_SignificantAcquisitionsAndDisposalsProFormaEarningsPerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SignificantAcquisitionsAndDisposalsProFormaEarningsPerShareBasic" id="snh_SignificantAcquisitionsAndDisposalsProFormaEarningsPerShareBasic" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SignificantAcquisitionsAndDisposalsNetIncomeLoss" id="snh_SignificantAcquisitionsAndDisposalsNetIncomeLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RevenueRecognitionTable" id="snh_RevenueRecognitionTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RevenueRecognitionLineItems" id="snh_RevenueRecognitionLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FurnitureFixturesAndEquipmentMember" id="snh_FurnitureFixturesAndEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FiniteLivedIntangibleLeaseAssetsAndLiabilitiesFutureAmortizationExpenseAbstract" id="snh_FiniteLivedIntangibleLeaseAssetsAndLiabilitiesFutureAmortizationExpenseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfSecuredAndOtherDebtTableTextBlock" id="snh_ScheduleOfSecuredAndOtherDebtTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfServiceAgreements" id="snh_NumberOfServiceAgreements" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageOfAverageBookValueOfAssets" id="snh_RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageOfAverageBookValueOfAssets" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageOfAverageHistoricalCostOfOtherRealEstateInvestments" id="snh_RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageOfAverageHistoricalCostOfOtherRealEstateInvestments" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageInExcessOfHistoricalCostOfOtherRealEstateInvestments" id="snh_RelatedPartyTransactionBusinessManagementAgreementCompensationAsPercentageInExcessOfHistoricalCostOfOtherRealEstateInvestments" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionBusinessManagementAgreementCompensationAverageHistoricalCostOfOtherRealEstateInvestments" id="snh_RelatedPartyTransactionBusinessManagementAgreementCompensationAverageHistoricalCostOfOtherRealEstateInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionPropertyManagementAgreementManagementFeesAsPercentageOfGrossRents" id="snh_RelatedPartyTransactionPropertyManagementAgreementManagementFeesAsPercentageOfGrossRents" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionPropertyManagementAgreementConstructionSupervisionFeesAsPercentageOfConstructionCosts" id="snh_RelatedPartyTransactionPropertyManagementAgreementConstructionSupervisionFeesAsPercentageOfConstructionCosts" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareOwnershipRestrictionsMaximumPercentageOfEquitySharesThatCanBeAcquiredWithoutApproval" id="snh_ShareOwnershipRestrictionsMaximumPercentageOfEquitySharesThatCanBeAcquiredWithoutApproval" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MinimumInvestmentOwnershipPercentageEligibleForOptionToCancelRightsOfLessee" id="snh_MinimumInvestmentOwnershipPercentageEligibleForOptionToCancelRightsOfLessee" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyTransactionBusinessManagementAndPropertyManagementFees" id="snh_RelatedPartyTransactionBusinessManagementAndPropertyManagementFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionIncentiveFee" id="snh_RelatedPartyTransactionIncentiveFee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionProRataShareOfInternalAuditCosts" id="snh_RelatedPartyTransactionProRataShareOfInternalAuditCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PeriodByWhichTermOfServiceAgreementsIsAutomaticallyRenewed" id="snh_PeriodByWhichTermOfServiceAgreementsIsAutomaticallyRenewed" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PeriodBeforeWhichWrittenNoticeRequiredForTerminationOfServiceAgreements" id="snh_PeriodBeforeWhichWrittenNoticeRequiredForTerminationOfServiceAgreements" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsToBeVestedOnEachOfNextFourAnniversaries" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsToBeVestedOnEachOfNextFourAnniversaries" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentOwnershipPercentageSubjectToInvestmentRestrictionsMinimum" id="snh_InvestmentOwnershipPercentageSubjectToInvestmentRestrictionsMinimum" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MaximumNumberOfAdditionalPropertiesThatCanBePurchased" id="snh_MaximumNumberOfAdditionalPropertiesThatCanBePurchased" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ValueInvestmentOwnedPurchasedFromUnderwriters" id="snh_ValueInvestmentOwnedPurchasedFromUnderwriters" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CommonStockDividendsOrdinaryIncomeDistributionPercentage" id="snh_CommonStockDividendsOrdinaryIncomeDistributionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonStockDividendsReturnOfCapitalDistributionPercentage" id="snh_CommonStockDividendsReturnOfCapitalDistributionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonStockDividendsCapitalGainDistributionPercentage" id="snh_CommonStockDividendsCapitalGainDistributionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonStockDividendsUnrecapturedSection1250GainDistributionPercentage" id="snh_CommonStockDividendsUnrecapturedSection1250GainDistributionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareAwardPlansMember" id="snh_ShareAwardPlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationArrangementShareBasedPaymentAwardByTitleOfIndividualAxis" id="snh_ScheduleOfShareBasedCompensationArrangementShareBasedPaymentAwardByTitleOfIndividualAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationArrangementShareBasedPaymentAwardTitleOfIndividualWithRelationshipToEntityDomain" id="snh_ScheduleOfShareBasedCompensationArrangementShareBasedPaymentAwardTitleOfIndividualWithRelationshipToEntityDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OfficersAndEmployeesMember" id="snh_OfficersAndEmployeesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrusteesMember" id="snh_TrusteesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateMarketValueOfSharesIssuedInPeriod" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateMarketValueOfSharesIssuedInPeriod" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMarketValueOfSharesIssuedInPeriodToEachIndividual" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardMarketValueOfSharesIssuedInPeriodToEachIndividual" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LesseeLeasePercentageInRealEstatePropertiesAcquired" id="snh_LesseeLeasePercentageInRealEstatePropertiesAcquired" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentPrepaymentPremium" id="snh_DebtInstrumentPrepaymentPremium" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AgreementToAcquireMember" id="snh_AgreementToAcquireMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AgreementToSellMember" id="snh_AgreementToSellMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfMutualFundsManagedByAffiliateOfRelatedParty" id="snh_NumberOfMutualFundsManagedByAffiliateOfRelatedParty" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfExecutiveOfficersAlsoServingAsOfficers" id="snh_NumberOfExecutiveOfficersAlsoServingAsOfficers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyEmployeesNumber" id="snh_RelatedPartyEmployeesNumber" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NoncashOrPartNoncashAcquisitionDebtAssumedInterestRate" id="snh_NoncashOrPartNoncashAcquisitionDebtAssumedInterestRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredTaxAssetsValuationAllowanceAsPercentageOfAggregateDeferredTaxAssets" id="snh_DeferredTaxAssetsValuationAllowanceAsPercentageOfAggregateDeferredTaxAssets" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ScheduleOfQuarterlyRevenueReclassificationsTableTextBlock" id="snh_ScheduleOfQuarterlyRevenueReclassificationsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionBusinessManagementAgreementMaximumNumberOfCommonSharesToBeIssuedForIncentiveFeeWeightedAverageNumberOfCommonSharesOutstandingMultiplier" id="snh_RelatedPartyTransactionBusinessManagementAgreementMaximumNumberOfCommonSharesToBeIssuedForIncentiveFeeWeightedAverageNumberOfCommonSharesOutstandingMultiplier" type="num:perShareItemType" us-gaap-att:deprecatedDate="2011-01-31" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentOwnedAdditionalNumberOfSharesAcquired" id="snh_InvestmentOwnedAdditionalNumberOfSharesAcquired" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentPropertyInsuranceCoverageAmount" id="snh_EquityMethodInvestmentPropertyInsuranceCoverageAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InvestmentOwnedAdditionalInvestment" id="snh_InvestmentOwnedAdditionalInvestment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AvailableForSaleSecuritiesInUnrealizedLossPositionsPeriod" id="snh_AvailableForSaleSecuritiesInUnrealizedLossPositionsPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfOtherCompaniesWhichAreShareholdersOfRelatedParty" id="snh_NumberOfOtherCompaniesWhichAreShareholdersOfRelatedParty" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="IncomeTaxAbstract" id="snh_IncomeTaxAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TaxBenefitsRecognitionBasisForUncertainTaxPositionLikelihoodRealizationGreaterThanPercentage" id="snh_TaxBenefitsRecognitionBasisForUncertainTaxPositionLikelihoodRealizationGreaterThanPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LeasesCommittedExpenditure" id="snh_LeasesCommittedExpenditure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LeaseCommittedButUnspentTenantRelatedObligations" id="snh_LeaseCommittedButUnspentTenantRelatedObligations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ImpairmentOfLongLivedAssetsSold" id="snh_ImpairmentOfLongLivedAssetsSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedScheduleAbstract" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedScheduleAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestInNextFiscalYear" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestInNextFiscalYear" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestInTwoYears" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestInTwoYears" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestInThreeYears" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestInThreeYears" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestInFourYears" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestInFourYears" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedClosingPrice" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedClosingPrice" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AllowanceForDoubtfulAccountsPolicyTextBlock" id="snh_AllowanceForDoubtfulAccountsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityOptionToIncreaseMaximumBorrowingCapacity" id="snh_LineOfCreditFacilityOptionToIncreaseMaximumBorrowingCapacity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="InterestExpenseAndOtherAssociatedCostsIncured" id="snh_InterestExpenseAndOtherAssociatedCostsIncured" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfMortgageLoansRepaid" id="snh_NumberOfMortgageLoansRepaid" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfRealEstatePropertiesSecuredByDebtInstrument" id="snh_NumberOfRealEstatePropertiesSecuredByDebtInstrument" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomeLossAttributableToEquityMethodInvesteeNetOfTax" id="snh_OtherComprehensiveIncomeLossAttributableToEquityMethodInvesteeNetOfTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LongLivedAssetsHeldForUseFairValueDisclosure" id="snh_LongLivedAssetsHeldForUseFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RealEstatePropertiesAcquiredIntangibleAssets" id="snh_RealEstatePropertiesAcquiredIntangibleAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="SaleOfAssetsMember" id="snh_SaleOfAssetsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPoolingAgreements" id="snh_NumberOfPoolingAgreements" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfPropertiesUnderAcceleratedLeaseTermination" id="snh_NumberOfPropertiesUnderAcceleratedLeaseTermination" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCommunitiesUnderAcceleratedLeaseTermination" id="snh_NumberOfCommunitiesUnderAcceleratedLeaseTermination" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCommunitiesUnderLongTermManagementAgreements" id="snh_NumberOfCommunitiesUnderLongTermManagementAgreements" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MountPleasantSouthCarolinaMember" id="snh_MountPleasantSouthCarolinaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FloridaAndMinnesotaMember" id="snh_FloridaAndMinnesotaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ColoradoIdahoMissouriNewYorkAndWashingtonMember" id="snh_ColoradoIdahoMissouriNewYorkAndWashingtonMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AdditionalSeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" id="snh_AdditionalSeriesOfIndividuallyImmaterialBusinessAcquisitionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementsRecurringAndNonrecurringMember" id="snh_FairValueMeasurementsRecurringAndNonrecurringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCommunitiesLeaseToBeTerminated" id="snh_NumberOfCommunitiesLeaseToBeTerminated" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfCommunitiesRemainingUnderLeaseTermination" id="snh_NumberOfCommunitiesRemainingUnderLeaseTermination" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EarlyRepaymentOfSeniorSecuredDebtVariablePortion" id="snh_EarlyRepaymentOfSeniorSecuredDebtVariablePortion" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="EarlyRepaymentOfSeniorSecuredDebtFixedPortion" id="snh_EarlyRepaymentOfSeniorSecuredDebtFixedPortion" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfRealEstatePropertiesReleasedFromMortgageCollateral" id="snh_NumberOfRealEstatePropertiesReleasedFromMortgageCollateral" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RealEstateAgreementsByTypeAxis" id="snh_RealEstateAgreementsByTypeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateAgreementsByTypeDomain" id="snh_RealEstateAgreementsByTypeDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingSegmentsNumber" id="snh_OperatingSegmentsNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="VariousMember" id="snh_VariousMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Mortgage5.81PercentDueOctober2015TwoMember" id="snh_Mortgage5.81PercentDueOctober2015TwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Mortgage6.015PercentDueMarch2015Member" id="snh_Mortgage6.015PercentDueMarch2015Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Mortgage5.64PercentDueJanuary2016Member" id="snh_Mortgage5.64PercentDueJanuary2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Mortgage6.15PercentDueJanuary2017Member" id="snh_Mortgage6.15PercentDueJanuary2017Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Mortgage5.86PercentDueMarch2017Member" id="snh_Mortgage5.86PercentDueMarch2017Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Mortgage4.375PercentDueSeptember2043Member" id="snh_Mortgage4.375PercentDueSeptember2043Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentVestedOnGrantDate" id="snh_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentVestedOnGrantDate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredLeasingCostsPolicyTextBlock" id="snh_DeferredLeasingCostsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredCostsLeasingWeightedAverageAmortizationPeriod" id="snh_DeferredCostsLeasingWeightedAverageAmortizationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredCostsLeasingExpectedFutureAmortizationAbstract" id="snh_DeferredCostsLeasingExpectedFutureAmortizationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredCostsLeasingExpectedFutureAmortizationYearOne" id="snh_DeferredCostsLeasingExpectedFutureAmortizationYearOne" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredCostsLeasingExpectedFutureAmortizationYearTwo" id="snh_DeferredCostsLeasingExpectedFutureAmortizationYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredCostsLeasingExpectedFutureAmortizationYearThree" id="snh_DeferredCostsLeasingExpectedFutureAmortizationYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredCostsLeasingExpectedFutureAmortizationYearFour" id="snh_DeferredCostsLeasingExpectedFutureAmortizationYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredCostsLeasingExpectedFutureAmortizationYearFive" id="snh_DeferredCostsLeasingExpectedFutureAmortizationYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DeferredCostsLeasingExpectedFutureAmortizationYearAfterYearFive" id="snh_DeferredCostsLeasingExpectedFutureAmortizationYearAfterYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="RealEstateAcquisition2011Member" id="snh_RealEstateAcquisition2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RealEstateAcquisition2012Member" id="snh_RealEstateAcquisition2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvestmentOwnedPurchasedFromUnderwritersShares" id="snh_InvestmentOwnedPurchasedFromUnderwritersShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
</xsd:schema>
