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        <TitleTxt>Vice Chair</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>6.15</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Marina Kellen French</PersonNm>
        <TitleTxt>Member</TitleTxt>
        <AverageHoursPerWeekRt>0.04</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.66</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Craig Ivey</PersonNm>
        <TitleTxt>Member</TitleTxt>
        <AverageHoursPerWeekRt>0.06</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>1.08</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Winfield P Jones</PersonNm>
        <TitleTxt>Member</TitleTxt>
        <AverageHoursPerWeekRt>0.03</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.48</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Warren Kanders</PersonNm>
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        <AverageHoursPerWeekRt>0.03</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.52</AverageHoursPerWeekRltdOrgRt>
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        <PersonNm>Monica Keany</PersonNm>
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        <PersonNm>Thomas J Kelly</PersonNm>
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        <PersonNm>David H Koch</PersonNm>
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        <PersonNm>Laurie Hodges Lapeyre</PersonNm>
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        <PersonNm>Pablo Legorreta</PersonNm>
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        <PersonNm>Lara Lerner</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kathy Leventhal</PersonNm>
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        <AverageHoursPerWeekRt>0.1</AverageHoursPerWeekRt>
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        <PersonNm>Marylin B Levitt</PersonNm>
        <TitleTxt>Member</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Thomas Lister</PersonNm>
        <TitleTxt>Vice Chair</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Alan S MacDonald</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>David M Madden</PersonNm>
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        <PersonNm>Richard L Menschel</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mary Kathryn Navab</PersonNm>
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        <PersonNm>Dean R O'Hare</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Terrence O'Toole</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Aldo Papone</PersonNm>
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        <PersonNm>Gordon Pattee</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Steven Rattner</PersonNm>
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        <PersonNm>Susan W Rose</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jonathan Sobel</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Deirdre Stanley</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robert K Steel</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Patricia Warner</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sanford I Weill</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kendrick R Wilson III</PersonNm>
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        <PersonNm>Ellen M Wright</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Louis A Shapiro</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Lisa Goldstein</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Stacey Malakoff</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Irene Koch</PersonNm>
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      <TotReportableCompRltdOrgAmt>6901284</TotReportableCompRltdOrgAmt>
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          <PersonNm>MICHAEL ANTHONY CONTRACTING</PersonNm>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>161 RAILROAD AVENUE</AddressLine1Txt>
            <CityNm>GARDEN CITY PARK</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>11040</ZIPCd>
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        <ServicesDesc>CONSTRUCTION</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>SKYLINE RESTORATION INC</PersonNm>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>11-20 37TH AVENUE</AddressLine1Txt>
            <CityNm>LONG ISLAND CITY</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>11101</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSTRUCTION</ServicesDesc>
        <CompensationAmt>1590414</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>CROTHALL HEALTHCARE INC</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>1500 LIBERTY RIDGE DRIVE SUITE 210</AddressLine1Txt>
            <CityNm>WAYNE</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>19087</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>HOUSEKEEPING</ServicesDesc>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>MERRITT ENGINEERING CONSULTANT</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>28-08 BAYSIDE LANE</AddressLine1Txt>
            <CityNm>BAYSIDE</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>11358</ZIPCd>
          </USAddress>
        </ContractorAddress>
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      <ContractorCompensationGrp>
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          <PersonNm>SPECIALTY MANAGEMENT COMPANY</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO BOX 68</AddressLine1Txt>
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            <StateAbbreviationCd>NJ</StateAbbreviationCd>
            <ZIPCd>07028</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSULTING</ServicesDesc>
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      <ProgramServiceRevenueGrp>
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      <ProgramServiceRevenueGrp>
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        <TotalRevenueColumnAmt>3949273</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>3949273</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
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        <BusinessCd>531110</BusinessCd>
        <TotalRevenueColumnAmt>1210109</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1210109</RelatedOrExemptFuncIncomeAmt>
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      <NetIncmFromFundraisingEvtGrp>
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      <GrantsToDomesticIndividualsGrp>
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      <ForeignGrantsGrp>
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      </ForeignGrantsGrp>
      <BenefitsToMembersGrp>
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      <PensionPlanContributionsGrp>
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        <ProgramServicesAmt>98445</ProgramServicesAmt>
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      <PayrollTaxesGrp>
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      <FeesForServicesManagementGrp>
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      <FeesForServicesLegalGrp>
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        <ManagementAndGeneralAmt>17884</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>62059</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesLobbyingGrp>
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      </FeesForServicesLobbyingGrp>
      <FeesForServicesProfFundraising>
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      </FeesForServicesProfFundraising>
      <FeesForSrvcInvstMgmntFeesGrp>
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        <ProgramServicesAmt>1462936</ProgramServicesAmt>
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      <PymtTravelEntrtnmntPubOfclGrp>
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      <ConferencesMeetingsGrp>
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      <InterestGrp>
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        <ProgramServicesAmt>527734</ProgramServicesAmt>
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      <PaymentsToAffiliatesGrp>
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        <ProgramServicesAmt>2602758</ProgramServicesAmt>
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      <OtherExpensesGrp>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>781813</ProgramServicesAmt>
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      <OtherExpensesGrp>
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      <TotalFunctionalExpensesGrp>
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      <PledgesAndGrantsReceivableGrp>
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        <EOYAmt>3174604</EOYAmt>
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      <FSAuditedInd>true</FSAuditedInd>
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    <IRS990ScheduleA documentId="IRS990ScheduleA">
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        <Contribution35ControlledInd>false</Contribution35ControlledInd>
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        <FormAndLineReferenceDesc>Part I, Line 11g (A), column v, vi</FormAndLineReferenceDesc>
        <ExplanationTxt>HSS Properties Corporation (Properties), a controlled subsidiary of The Hospital for Special Surgery Fund, Inc, is a not-for-profit corporation organized under the Not-for-Profit Corporation Law of the State of New York for the purpose of managing and operating real estate for the New York Society for the Relief of the Ruptured and Crippled, Maintaining the Hospital for Special Surgery (the Hospital).</ExplanationTxt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>TENANT IMPROVEMENT PAYABLE</Desc>
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      <TotalRevEtcAuditedFinclStmtAmt>49691282</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueSubtotalAmt>49691282</RevenueSubtotalAmt>
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      <RevenueNotReportedFinclStmtAmt>-871381</RevenueNotReportedFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B &amp; PART XII, LINE 2D - OTHER "REV/EXP RECONCILIATION"</FormAndLineReferenceDesc>
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      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="IRS990ScheduleJ">
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      <CompensationSurveyInd>X</CompensationSurveyInd>
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        <OtherCompensationRltdOrgsAmt>418</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>11700</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>29850</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>164930</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Bryan Kelly</PersonNm>
        <TitleTxt>Member/Attending Physician</TitleTxt>
        <CompensationBasedOnRltdOrgsAmt>115013</CompensationBasedOnRltdOrgsAmt>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationRltdOrgsAmt>955</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>11700</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>36495</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>164163</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Linda Russell - Left CY16'</PersonNm>
        <TitleTxt>Member/ Attending Physician</TitleTxt>
        <CompensationBasedOnRltdOrgsAmt>271122</CompensationBasedOnRltdOrgsAmt>
        <BonusRelatedOrganizationsAmt>112500</BonusRelatedOrganizationsAmt>
        <OtherCompensationRltdOrgsAmt>178568</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>23850</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>38389</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>624429</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Louis A Shapiro</PersonNm>
        <TitleTxt>President &amp; CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>59124</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>1123349</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>81689</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>1552083</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1875</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>35631</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>994</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>18881</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>2466</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>46848</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>146148</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>2776792</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Lisa Goldstein</PersonNm>
        <TitleTxt>Executive VP &amp; COO</TitleTxt>
        <BaseCompensationFilingOrgAmt>80031</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>720277</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>53540</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>481856</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>3276</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>29489</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>2385</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>21465</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>3330</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>29968</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>142562</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1283055</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Stacey Malakoff</PersonNm>
        <TitleTxt>Executive VP &amp; CFO</TitleTxt>
        <BaseCompensationFilingOrgAmt>112881</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>827791</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>66692</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>489078</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>3732</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>27370</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>2862</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>20988</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>4005</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>29369</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>190172</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1394596</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Irene Koch</PersonNm>
        <TitleTxt>Exec VP &amp; Chief Legal Officer</TitleTxt>
        <BaseCompensationFilingOrgAmt>48771</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>438941</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>19785</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>178062</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>108</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>963</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>1988</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>17888</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>3779</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>34025</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>74431</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>669879</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 5B</FormAndLineReferenceDesc>
        <ExplanationTxt>Certain Employed Physicians listed on Part VII, Section A, Line 1A receive compensation in part, based on professional service generated from services they personally performed in their individual practices. In 2016, no Physician was paid compensation contingent upon the organization's overall revenue or net earnings.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 6B</FormAndLineReferenceDesc>
        <ExplanationTxt>Performance based incentive awards are paid to officers and key employees based on a number of important quality, satisfaction, efficiency, and financial measures, of which achieving budget is a factor.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A - LINE 6 &amp; 7A - "MEMBERSHIP"</FormAndLineReferenceDesc>
        <ExplanationTxt>HSS PROPERTIES CORPORATION IS A MEMBERSHIP CORPORATION WITH THE HOSPITAL FOR SPECIAL SURGERY FUND, INC, AS ITS SOLE MEMBER. THE HOSPITAL FOR SPECIAL SURGERY FUND, INC., AS THE MEMBER OF HSS PROPERTIES CORPORATION, ELECTS THE BOARD OF TRUSTEES OF HSS PROPERTIES CORPORATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B - LINE 11B, "REVIEW PROCESS"</FormAndLineReferenceDesc>
        <ExplanationTxt>PRIOR TO SUBMITTING THE FORM 990 TO THE INTERNAL REVENUE SERVICE (IRS), THERE IS AN ESTABLISHED PROCESS FOR REVIEW OF THE DOCUMENT IN ITS ENTIRETY BY THE GOVERNING BODY WHOSE EVALUATIONS ARE MADE IN THE BEST INTEREST OF HSS PROPERTIES CORPORATION. THE FORM 990 IS FIRST REVIEWED WITH THE EXECUTIVE COMPENSATION COMMITTEE OF THE BOARD OF TRUSTEES. THE REVIEWED FORM 990 IS THEN SUBMITTED TO THE FULL BOARD OF TRUSTEES. THE TRUSTEES ARE PROVIDED A COPY OF THE FORM 990 VIA COMPACT DISC PRIOR TO SUBMISSION OF THE FORM. IN ADDITION, SIGNIFICANT AREAS OF FORM 990 ARE DISCUSSED AT A BOARD OF TRUSTEES MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B - LINE 12C, "CONFLICT OF INTEREST POLICY"</FormAndLineReferenceDesc>
        <ExplanationTxt>ON AN ANNUAL BASIS, FINANCIAL INTEREST DISCLOSURE STATEMENTS ARE SENT TO ALL BOARD MEMBERS, OFFICERS, AND MANAGEMENT. OUR CONFLICT OF INTEREST POLICY ALSO REQUIRES THAT ANY CHANGES BE COMMUNICATED TO THE OFFICE OF CORPORATE COMPLIANCE WITHIN 30 DAYS. THE INFORMATION RECEIVED IS ENTERED INTO A DATABASE AND REVIEWED FOR POTENTIAL CONFLICTS OF INTEREST. THE DATABASE INFORMATION IS ALSO REVIEWED BY THE EXECUTIVE VICE PRESIDENT FOR LEGAL AFFAIRS, THE CHIEF EXECUTIVE OFFICER, AND THE AUDIT AND CORPORATE COMPLIANCE COMMITTEE OF THE BOARD OF TRUSTEES. IN ADDITION TO SENDING DISCLOSURE STATEMENTS DIRECTLY TO THE GROUP NOTED ABOVE, INDUSTRY WEBSITES ARE MONITORED FOR DISCLOSURES RELATED TO EMPLOYEES OF HSS PROPERTIES. THIS INFORMATION IS ENTERED INTO THE DATABASE, AS WELL. HSS PROPERTIES HAS A CONFLICT OF INTEREST TASK FORCE THAT MEETS THREE TIMES A YEAR, OR AS NECESSARY, TO REVIEW AND UPDATE THE CONFLICTS OF INTEREST POLICIES AND PROCEDURES. HSS' POLICY ON CONFLICT OF INTEREST IN DAY-TO-DAY OPERATIONS STATES THAT IF HSS IS CONTEMPLATING A TRANSACTION WHICH MIGHT POSSIBLY BENEFIT (OR APPEAR TO BENEFIT) A COVERED PERSON OR ANY MEMBER OF HIS/HER IMMEDIATE FAMILY, THEN THE POTENTIAL BENEFIT OR CONFLICT MUST BE DISCLOSED TO, AND APPROVED BY, A DISINTERESTED OFFICER OF HSS BEFORE THE TRANSACTION MAY PROCEED. ACCORDINGLY, A COVERED PERSON MAY NOT PLACE BUSINESS WITH ANY THIRD PARTY (E.G., A VENDOR, COMPETITOR, OR OTHER ORGANIZATION) IN WHICH THAT PERSON OR ANY MEMBER OF HIS/HER IMMEDIATE FAMILY HAS AN INTEREST, UNLESS THAT INTEREST IS DISCLOSED TO, AND THE TRANSACTION IS APPROVED BY, THE VICE PRESIDENT FOR CORPORATE COMPLIANCE AND INTERNAL AUDIT ("CORPORATE COMPLIANCE OFFICER").</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECT B - LINE 15A &amp; 15B, "PROCESS FOR DETERMINING COMP"</FormAndLineReferenceDesc>
        <ExplanationTxt>HSS PROPERTIES CORPORATION IS COMMITTED TO ENSURING THAT ITS EXECUTIVE COMPENSATION PROGRAM ADHERES TO THE HIGHEST STANDARDS OF REGULATORY COMPLIANCE AND BEST CORPORATE GOVERNANCE. THE HSS PROPERTIES CORPORATION BOARD HAS CHARGED THE COMPENSATION COMMITTEE (WHICH IS COMPOSED OF INDEPENDENT BOARD MEMBERS WITH NO CONFLICTS OF INTEREST IN REGARD TO EXECUTIVE COMPENSATION) WITH MAKING ALL DECISIONS RELATED TO COMPENSATION FOR OFFICERS AND KEY EMPLOYEES. THE COMMITTEE RETAINS AN INDEPENDENT COMPENSATION CONSULTANT TO ASSIST IT IN THIS PROCESS. COMPENSATION LEVELS ARE ESTABLISHED CONSIDERING DATA FOR FUNCTIONALLY COMPARABLE ROLES IN COMPARABLE ORGANIZATIONS, AN ASSESSMENT OF PERFORMANCE, AND OTHER BUSINESS JUDGMENT FACTORS, CONSISTENT WITH HSS PROPERTIES CORPORATION'S EXECUTIVE COMPENSATION PHILOSOPHY. THE COMMITTEE'S DECISIONS ARE MADE IN THE BEST INTERESTS OF HSS PROPERTIES CORPORATION, AND ARE INTENDED TO ENSURE THE RECRUITMENT AND RETENTION OF KEY EXECUTIVE TALENT, CONSISTENT WITH THE MARKET PRACTICES OF OTHER NOT-FOR-PROFIT HEALTH CARE ORGANIZATIONS OF COMPARABLE MISSION AND COMPLEXITY, CONSIDERING BOTH LOCAL AND NATIONAL MARKET CHALLENGES IN SUCH REGARD. ON AN ANNUAL BASIS (INCLUDING 2016), THE COMMITTEE PROVIDES THE FULL BOARD WITH AN OVERVIEW OF ITS DETERMINATIONS AND PROCESS. HSS PROPERTIES CORPORATION ESTABLISHED THIS PROCESS IN AN EFFORT TO COMPLY WITH THE INTERMEDIATE SANCTIONS GUIDELINES FOR QUALIFYING FOR THE REBUTTABLE PRESUMPTION OF REASONABLENESS, AS WELL AS BEST CORPORATE GOVERNANCE PRACTICES IN ENSURING THE TRANSPARENCY OF THE EXECUTIVE COMPENSATION DECISION-MAKING PROCESS WITH THE BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B - LINE 19, "DISCLOSURE GOVERNING DOCUMENTS"</FormAndLineReferenceDesc>
        <ExplanationTxt>HSS PROPERTIES CORPORATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS AVAILABLE TO THE GENERAL PUBLIC UPON REQUEST FROM THE OFFICE OF LEGAL AFFAIRS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="IRS990ScheduleR">
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          <BusinessNameLine1Txt>NY SOC REL RUPT CRIPLD MAINTAING HSS</BusinessNameLine1Txt>
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          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
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        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
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        <PublicCharityStatusTxt>3</PublicCharityStatusTxt>
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          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
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      <IdRelatedTaxExemptOrgGrp>
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          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>136714749</EIN>
        <PrimaryActivitiesTxt>FUNDRAISING</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501 (C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>false</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>HSS HORIZONS INC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>134152131</EIN>
        <PrimaryActivitiesTxt>RESEARCH SUPP</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501 (C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>12 TYPE I</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>HSS FUND INC</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>true</ControlledOrganizationInd>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>TJA ORTHOPEDIC SURGERY PC</BusinessNameLine1Txt>
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          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
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        <EIN>815178969</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501 (C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>PENDING</PublicCharityStatusTxt>
        <DirectControllingEntityName>
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        <ControlledOrganizationInd>false</ControlledOrganizationInd>
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      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS ASC OF MANHATTAN LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>1233 2ND AVE</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10065</ZIPCd>
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        <EIN>471353602</EIN>
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        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <PredominantIncomeTypeTxt>N/A</PredominantIncomeTypeTxt>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblPartnershipGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS WESTSIDE ASC LLC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>600 WEST 58TH STREET</AddressLine1Txt>
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          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10019</ZIPCd>
        </USAddress>
        <EIN>814351390</EIN>
        <PrimaryActivitiesTxt>HEALTH CARE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <PredominantIncomeTypeTxt>N/A</PredominantIncomeTypeTxt>
      </IdRelatedOrgTxblPartnershipGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>MIAC</BusinessNameLine1Txt>
        </RelatedOrganizationName>
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          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>981050215</EIN>
        <PrimaryActivitiesTxt>SELF-INDEMNITY</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CJ</LegalDomicileForeignCountryCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C CORP</EntityTypeTxt>
        <ShareOfTotalIncomeAmt>0</ShareOfTotalIncomeAmt>
        <ShareOfEOYAssetsAmt>0</ShareOfEOYAssetsAmt>
        <ControlledOrganizationInd>true</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>HSS VENTURES</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>535 EAST 70TH STREET</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10021</ZIPCd>
        </USAddress>
        <EIN>061624300</EIN>
        <PrimaryActivitiesTxt>HLTH CARE SERVICE</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C CORP</EntityTypeTxt>
        <ShareOfTotalIncomeAmt>0</ShareOfTotalIncomeAmt>
        <ShareOfEOYAssetsAmt>0</ShareOfEOYAssetsAmt>
        <ControlledOrganizationInd>true</ControlledOrganizationInd>
      </IdRelatedOrgTxblCorpTrGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>false</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>false</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>false</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>false</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>false</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>false</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>false</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>false</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>false</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>true</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>false</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>false</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>false</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>false</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>false</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>true</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>false</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>false</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>false</TransferFromOtherOrgInd>
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          <BusinessNameLine1Txt>HOSPITAL FOR SPECIAL SURGERY</BusinessNameLine1Txt>
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        <TransactionTypeTxt>J</TransactionTypeTxt>
        <InvolvedAmt>38978689</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FMV</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HOSPITAL FOR SPECIAL SURGERY</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>P</TransactionTypeTxt>
        <InvolvedAmt>31543593</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FMV</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HSS ASC OF MANHATTAN LLC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>J</TransactionTypeTxt>
        <InvolvedAmt>689471</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FMV</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HSS ASC OF MANHATTAN LLC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>Q</TransactionTypeTxt>
        <InvolvedAmt>428794</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FMV</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>