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      <Form990PartVIISectionAGrp>
        <PersonNm>ROGER HAYNES</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>TIMOTHY CODRINGTON</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>PERRIN GRAYSON</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SARAH PERRY</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NANCY MAULL</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>AMY RYAN</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>2.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CREELEA HENDERSON PANGARO</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CATHERINE POWELL</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>AUSTIN V SHAPARD</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>2.00</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>WINSTON LANGLEY</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ANNIE MACLACHLAN LEWIS</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>2.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>GEORGE RAINE</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LEAH ROSOVSKY</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CHRISTOPHER J BOUDROT</PersonNm>
        <TitleTxt>DIRECTOR OF FINANCE</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>2.00</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BRIDGET KEANE</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN BUCHTEL</PersonNm>
        <TitleTxt>CURATOR,RARE BOOKS/SPEC. COLLECTIONS</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <OtherCompensationAmt>32009</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>GREGORY MORRIS</PersonNm>
        <TitleTxt>DIRECTOR OF FACILITIES AND SECURITY</TitleTxt>
        <AverageHoursPerWeekRt>35.00</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JACQUELINE CHAMBERS</PersonNm>
        <TitleTxt>MAJOR GIFT OFFICER</TitleTxt>
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        <OtherCompensationAmt>27158</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ANDRIA LAURIA</PersonNm>
        <TitleTxt>I.T. MANAGER</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.00</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <TotalReportableCompFromOrgAmt>1337275</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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      <IndivRcvdGreaterThan100KCnt>8</IndivRcvdGreaterThan100KCnt>
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      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>TG GALLAGHER MECHANICAL CONTRACTORS</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>309 WAVERLY OAKS ROAD SUITE 200</AddressLine1Txt>
            <CityNm>WALTHAM</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02452</ZIPCd>
          </USAddress>
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        <ServicesDesc>HVAC</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>THE CATERED AFFAIR</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>70 LEDGEWOOD PLACE</AddressLine1Txt>
            <CityNm>ROCKLAND</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02370</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>EVENT CATERING</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>MINELLI INC</BusinessNameLine1Txt>
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        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>175 PORTLAND STREET 5TH FLOOR</AddressLine1Txt>
            <CityNm>BOSTON</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02114</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>BRANDING &amp; MARKETING CONSULTING</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>ONE DIVERSIFIED LLC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>2975 NORTHWOODS PKWY</AddressLine1Txt>
            <CityNm>PEACHTREE CORNERS</CityNm>
            <StateAbbreviationCd>GA</StateAbbreviationCd>
            <ZIPCd>30071</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>AV TECHNOLOGY IMPLEMENTATION</ServicesDesc>
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      <TotalContributionsAmt>4134636</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>FEES FOR LIBRARY USE</Desc>
        <BusinessCd>713990</BusinessCd>
        <TotalRevenueColumnAmt>1875781</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1875781</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>GENERAL ADMISSION</Desc>
        <BusinessCd>713990</BusinessCd>
        <TotalRevenueColumnAmt>188196</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>188196</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>LECTURES, CONCERTS &amp; EXHIBITIONS</Desc>
        <BusinessCd>713990</BusinessCd>
        <TotalRevenueColumnAmt>61284</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>61284</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>OTHER PROGRAM REVENUE</Desc>
        <BusinessCd>713990</BusinessCd>
        <TotalRevenueColumnAmt>49918</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>49918</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>PHOTOGRAPHIC SERVICES</Desc>
        <BusinessCd>713990</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>3938</RelatedOrExemptFuncIncomeAmt>
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      <TotalProgramServiceRevenueAmt>2179117</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>1989566</TotalRevenueColumnAmt>
        <ExclusionAmt>1989566</ExclusionAmt>
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      <GrossRentsGrp>
        <RealAmt>536981</RealAmt>
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      <LessRentalExpensesGrp>
        <RealAmt>59930</RealAmt>
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      <RentalIncomeOrLossGrp>
        <RealAmt>477051</RealAmt>
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        <SecuritiesAmt>944562</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>944562</TotalRevenueColumnAmt>
        <ExclusionAmt>944562</ExclusionAmt>
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        <ExclusionAmt>22381</ExclusionAmt>
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        <ExclusionAmt>3448409</ExclusionAmt>
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        <ProgramServicesAmt>175519</ProgramServicesAmt>
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        <FundraisingAmt>153579</FundraisingAmt>
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        <ProgramServicesAmt>164367</ProgramServicesAmt>
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        <ProgramServicesAmt>697973</ProgramServicesAmt>
        <ManagementAndGeneralAmt>91854</ManagementAndGeneralAmt>
        <FundraisingAmt>135115</FundraisingAmt>
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        <ProgramServicesAmt>228381</ProgramServicesAmt>
        <ManagementAndGeneralAmt>44651</ManagementAndGeneralAmt>
        <FundraisingAmt>45806</FundraisingAmt>
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        <ManagementAndGeneralAmt>17875</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>56718</ManagementAndGeneralAmt>
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        <FundraisingAmt>55129</FundraisingAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>134906</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>94166</ManagementAndGeneralAmt>
        <FundraisingAmt>88260</FundraisingAmt>
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        <ProgramServicesAmt>26387</ProgramServicesAmt>
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        <ProgramServicesAmt>120322</ProgramServicesAmt>
        <ManagementAndGeneralAmt>50153</ManagementAndGeneralAmt>
        <FundraisingAmt>13645</FundraisingAmt>
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        <ProgramServicesAmt>334456</ProgramServicesAmt>
        <ManagementAndGeneralAmt>23818</ManagementAndGeneralAmt>
        <FundraisingAmt>127055</FundraisingAmt>
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        <ProgramServicesAmt>2744099</ProgramServicesAmt>
        <ManagementAndGeneralAmt>61507</ManagementAndGeneralAmt>
        <FundraisingAmt>22165</FundraisingAmt>
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        <ProgramServicesAmt>11695</ProgramServicesAmt>
        <ManagementAndGeneralAmt>11700</ManagementAndGeneralAmt>
        <FundraisingAmt>1185</FundraisingAmt>
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        <ProgramServicesAmt>1672853</ProgramServicesAmt>
        <ManagementAndGeneralAmt>22213</ManagementAndGeneralAmt>
        <FundraisingAmt>13670</FundraisingAmt>
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        <TotalAmt>714437</TotalAmt>
        <ProgramServicesAmt>714437</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>EVENT PROGRAMMING</Desc>
        <TotalAmt>249473</TotalAmt>
        <ProgramServicesAmt>199460</ProgramServicesAmt>
        <FundraisingAmt>50013</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>ART EXHIBITIONS</Desc>
        <TotalAmt>218550</TotalAmt>
        <ProgramServicesAmt>218550</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>CATALOGING AND COLLECTI</Desc>
        <TotalAmt>155953</TotalAmt>
        <ProgramServicesAmt>155953</ProgramServicesAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
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        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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        <CurrentTaxYearMinus1YearAmt>2997595</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>4134636</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus1YearAmt>2997595</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>4134636</CurrentTaxYearAmt>
        <TotalAmt>19226878</TotalAmt>
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        <CurrentTaxYearMinus3YearsAmt>751086</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>2175690</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>2397446</CurrentTaxYearMinus1YearAmt>
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      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
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        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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    </IRS990ScheduleB>
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      <CollUsedScholarlyRsrchInd>X</CollUsedScholarlyRsrchInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <CollUsedLoanOrExchProgInd>X</CollUsedLoanOrExchProgInd>
      <SolicitedAssetsSaleInd>0</SolicitedAssetsSaleInd>
      <CYEndwmtFundGrp>
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        <InvestmentEarningsOrLossesAmt>8160056</InvestmentEarningsOrLossesAmt>
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        <EndYearBalanceAmt>87121460</EndYearBalanceAmt>
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      <CYMinus1YrEndwmtFundGrp>
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        <ContributionsAmt>713406</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>17044581</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>6066730</OtherExpendituresAmt>
        <EndYearBalanceAmt>84112651</EndYearBalanceAmt>
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        <InvestmentEarningsOrLossesAmt>10024523</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>7347228</OtherExpendituresAmt>
        <EndYearBalanceAmt>72421394</EndYearBalanceAmt>
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        <ContributionsAmt>60498</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-17807086</InvestmentEarningsOrLossesAmt>
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        <EndYearBalanceAmt>66890422</EndYearBalanceAmt>
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        <EndYearBalanceAmt>92938942</EndYearBalanceAmt>
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      <EndowmentsHeldRelatedOrgInd>1</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>1</RelatedOrgListSchRInd>
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      <OtherAssetsOrgGrp>
        <Desc>OTHER ASSETS</Desc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COLLECTIONS WHICH WERE ACQUIRED THROUGH PURCHASES AND CONTRIBUTIONS SINCE THE ATHENAEUM'S INCEPTION ARE NOT RECOGNIZED AS ASSETS ON THE CONSOLIDATED STATEMENT OF FINANCIAL POSITION. PURCHASES OF COLLECTION ITEMS ARE RECORDED AS DECREASES IN NET ASSETS WITHOUT DONOR RESTRICTIONS IN THE YEAR IN WHICH THE ITEMS ARE ACQUIRED AND AS RELEASES OF RESTRICTED NET ASSETS IF THE ASSETS USED TO PURCHASE THE ITEMS WERE USED TO FUND THE PURCHASE. CONTRIBUTED COLLECTION ITEMS ARE NOT REFLECTED AS REVENUE IN THE CONSOLIDATED FINANCIAL STATEMENTS. PROCEEDS FROM DE-ACCESSIONS OR INSURANCE RECOVERIES ARE REFLECTED AS INCREASES IN NET ASSETS. THE ATHENAEUM'S COLLECTIONS ARE MADE UP OF BOOKS, ARTIFACTS OF HISTORICAL SIGNIFICANCE AND ART OBJECTS THAT ARE HELD FOR EDUCATIONAL, RESEARCH, SCIENTIFIC AND CURATORIAL PURPOSES. EACH OF THE ITEMS IS CATALOGED, PRESERVED AND CARED FOR, AND ACTIVITIES VERIFYING THEIR EXISTENCE AND ACCESSING THEIR CONDITION ARE PERFORMED CONTINUOUSLY.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM'S COLLECTIONS COMPRISE OVER HALF A MILLION VOLUMES, EXTENSIVE HOLDINGS OF PAINTINGS, SCULPTURES, PRINTS, AND PHOTOGRAPHS. PARTICULAR STRENGTHS ARE IN BOSTON HISTORY, NEW ENGLAND STATE AND LOCAL HISTORY, BIOGRAPHY, ENGLISH AND AMERICAN LITERATURE, AND THE FINE AND DECORATIVE ARTS. THE ATHENAEUM SUPPORTS A DYNAMIC EXHIBITION PROGRAM AND SPONSORS A LIVELY VARIETY OF EVENTS SUCH AS LECTURES AND CONCERTS. IT ALSO SERVES AS A STIMULATING CENTER FOR DISCUSSIONS AMONG SCHOLARS, BIBLIOPHILES, AND A VARIETY OF COMMUNITY-INTEREST GROUPS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM'S ENDOWMENT CONSISTS OF 500 ENDOWMENT FUNDS ESTABLISHED FOR A VARIETY OF PURPOSES. ITS ENDOWMENT INCLUDES BOTH DONOR-RESTRICTED ENDOWMENT FUNDS AND FUNDS DESIGNATED BY THE BOARD TO FUNCTION AS ENDOWMENTS. NET ASSETS ASSOCIATED WITH ENDOWMENT FUNDS ARE CLASSIFIED AND REPORTED BASED ON THE EXISTENCE OR ABSENCE OF DONOR-IMPOSED OR LEGAL RESTRICTIONS. THE BOARD HAS INTERPRETED THE UNIFORM PRUDENT MANAGEMENT OF INSTITUTIONAL FUNDS ACT ("UPMIFA") AS ENACTED IN MASSACHUSETTS AS REQUIRING THE TRACKING OF THE ORIGINAL GIFT AMOUNTS OF DONOR-RESTRICTED ENDOWMENT FUNDS ABSENT EXPLICIT DONOR STIPULATIONS TO THE CONTRARY. THE ATHENAEUM TRACKS IN PERPETUITY: (A) THE ORIGINAL VALUE OF GIFTS DONATED TO THE PERMANENT ENDOWMENT, (B) THE ORIGINAL VALUE OF SUBSEQUENT GIFTS TO THE PERMANENT ENDOWMENT AND (C) ANY ACCUMULATIONS TO THE PERMANENT ENDOWMENT MADE IN ACCORDANCE WITH THE DIRECTION OF THE APPLICABLE DONOR GIFT AND INSTRUMENT AT THE TIME THE ACCUMULATION IS ADDED TO THE FUND, AS APPLICABLE.</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>THE ATHENAEUM ACCOUNTS FOR UNCERTAINTY IN INCOME TAXES IN ACCORDANCE WITH ASC TOPIC, INCOME TAXES. THIS STANDARD CLARIFIES THE ACCOUNTING FOR UNCERTAINTY IN TAX POSITIONS AND PRESCRIBES A RECOGNITION THRESHOLD AND MEASUREMENT ATTRIBUTE FOR THE CONSOLIDATED FINANCIAL STATEMENTS REGARDING A TAX POSITION TAKEN OR EXPECTED TO BE TAKEN IN A TAX RETURN. THE ATHENAEUM HAS DETERMINED THAT THERE ARE NO UNCERTAIN TAX POSITIONS WHICH QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE CONSOLIDATED FINANCIAL STATEMENTS AT SEPTEMBER 30, 2025.</ExplanationTxt>
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      <EmailSolicitationsInd>X</EmailSolicitationsInd>
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      <AgrmtProfFundraisingActyInd>1</AgrmtProfFundraisingActyInd>
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          <StateAbbreviationCd>NY</StateAbbreviationCd>
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      <FundraiserActivityInfoGrp>
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          <CityNm>WELLESLEY</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02482</ZIPCd>
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        <PersonNm>CHRISTOPHER J BOUDROT</PersonNm>
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        <PersonNm>JOHN BUCHTEL</PersonNm>
        <TitleTxt>CURATOR,RARE BOOKS/SPEC. COLLECTIONS</TitleTxt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>GREGORY MORRIS</PersonNm>
        <TitleTxt>DIRECTOR OF FACILITIES AND SECURITY</TitleTxt>
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    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <ArtHistoricalTreasuresGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>136</ContributionCnt>
        <NoncashContributionsRptF990Amt>0</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>UNRECORDED FOR GAAP</MethodOfDeterminingRevenuesTxt>
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      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>8</ContributionCnt>
        <NoncashContributionsRptF990Amt>176145</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
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      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NUMBER LISTED IN PART I, LINE 2, COLUMN (B) REPRESENTS THE NUMBER OF CONTRIBUTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I &amp; III, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MISSION OF THE BOSTON ATHENAEUM IS TO ENGAGE ALL WHO SEEK KNOWLEDGE BY MAKING ACCESSIBLE OUR LIBRARY'S COLLECTIONS AND SPACES, THEREBY INSPIRING REFLECTION, DISCOURSE, CREATIVE EXPRESSION, AND JOY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING THE REPORTING PERIOD, THE PROPRIETORS OF THE BOSTON ATHENAEUM AMENDED ITS BYLAWS TO INCREASE THE MAXIMUM ALLOWABLE NUMBER OF TRUSTEES FROM TWENTY-ONE (21) TO TWENTY-FIVE (25) MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>PLEASE REFER TO THE RESPONSE TO FORM 990, PART VI, SECTION A, LINE 7A BELOW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOSTON ATHENAEUM WAS INCORPORATED AS A SHAREHOLDER ORGANIZATION BY THE MASSACHUSETTS GENERAL COURT (THE STATE LEGISLATURE) IN 1807. ATHENAEUM SHAREHOLDERS ARE TERMED "PROPRIETORS." THE GENERAL COURT HAS AUTHORIZED 1,049 ATHENAEUM PROPRIETORS. THESE PROPRIETORS' SOLE FUNCTION IS TO ELECT THE OFFICERS AND GOVERNING BOARD OF THE ATHENAEUM. PROPRIETOR SHARES MAY BE BOUGHT OR SOLD, GIVEN OR BEQUEATHED. THE PROPRIETORS THEMSELVES HAVE NO CLAIM ON THE NET ASSETS OF THE ATHENAEUM, NOR DO THEY RECEIVE ANY PERSONAL FINANCIAL BENEFIT RESULTING FROM THEIR HOLDING OF THE PROPRIETORSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>PRIOR TO FILING FORM 990, A SPECIAL MEETING OF THE AUDIT &amp; RISK COMMITTEE, WHO IS DELEGATED AUTHORITY TO APPROVE THE RETURN, WAS HELD. THE RETURN WAS PRESENTED BY THE DIRECTOR OF FINANCE, WHO WAS AVAILABLE TO ANSWER QUESTIONS AND TO CERTIFY THE ACCURACY OF INFORMATION PROVIDED ON THE RETURN. THE COMMITTEE VOTED TO APPROVE THE RETURN BASED ON EXAMINATION OF THE RETURN AND CERTIFICATIONS MADE BY THE DIRECTOR OF FINANCE. A COMPLETE COPY OF THE FORM 990 WAS PROVIDED TO THE ENTIRE BOARD VIA EMAIL, PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAINTAINS A WRITTEN CONFLICTS-OF-INTEREST POLICY. THE POLICY REQUIRES OFFICERS, DIRECTORS, TRUSTEES AND KEY EMPLOYEES TO COMPLETE AN ANNUAL CONFLICTS-OF-INTEREST DISCLOSURE STATEMENT. THE STATEMENTS ARE DISCUSSED AND CONSIDERED PER THE POLICY AT A MEETING OF THE BOARD OF TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH YEAR THE TRUSTEES EVALUATE THE COMPENSATION OF THE EXECUTIVE DIRECTOR OBJECTIVELY, TAKING INTO ACCOUNT COMPENSATION PAID BY SIMILAR ORGANIZATIONS FOR FUNCTIONALLY COMPARABLE POSITIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ATHENAEUM WAS INCORPORATED IN 1807. UPON THE ENACTMENT OF THE FEDERAL INCOME TAX IN THE 20TH CENTURY, THE IRS DETERMINED THAT THE ATHENAEUM WAS EXEMPT FROM TAXATION. THIS IRS DETERMINATION OCCURRED PRIOR TO THE ESTABLISHMENT OF THE APPLICATION PROCESS THAT INCLUDES FORM 1023. CONSEQUENTLY NO FORM 1023 HAS BEEN REQUIRED BY THE IRS OR PREPARED BY THE ATHENAEUM. THE ATHENAEUM'S BYLAWS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE FOR REVIEW UPON REQUEST. THE COMPLETE AUDITED FINANCIAL STATEMENTS ARE AVAILABLE ON THE ATHENAEUM'S WEBSITE: HTTP://WWW.BOSTONATHENAEUM.ORG. THE FORM 990 AND AUDITED FINANCIAL STATEMENTS ARE ALSO AVAILABLE VIA THE MASSACHUSETTS ATTORNEY GENERAL'S WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THIS PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
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        <MethodOfAmountDeterminationTxt>BOOK VALUE</MethodOfAmountDeterminationTxt>
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