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        <PersonNm>NAVJEET K BAL</PersonNm>
        <TitleTxt>Trustee (effective January 2021)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOSEPH S BERMAN</PersonNm>
        <TitleTxt>Trustee (effective January 2021)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MICHAEL RUSH</PersonNm>
        <TitleTxt>Trustee (effective January 2021)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CHRISTIAN J WESTRA</PersonNm>
        <TitleTxt>Trustee (effective January 2021)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOSE C MASSO III</PersonNm>
        <TitleTxt>Trustee (effective May 2022)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DOCTOR LYNN PERRY WOOTEN</PersonNm>
        <TitleTxt>Trustee (effective May 2022)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>PORSHA OLAYIWOLA</PersonNm>
        <TitleTxt>Trustee (effective September 2023)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES CANALES</PersonNm>
        <TitleTxt>Trusteee (effective September 2023)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JULIE KIM</PersonNm>
        <TitleTxt>Trusteee (effective May 2024)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JONATHAN S LAVINE</PersonNm>
        <TitleTxt>Trusteee (effective May 2024)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>CHYNAH TYLER</PersonNm>
        <TitleTxt>Trustee (term ended May 2024)</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>22032</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>1311702</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>223079</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>91</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>EMCOR Service-Northeast dba Comm Air Balco</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>P O Box 845286</AddressLine1Txt>
            <CityNm>Boston</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02284</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>HVAC</ServicesDesc>
        <CompensationAmt>537195</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Securitas Security Services USA Inc</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>P O Box 403412</AddressLine1Txt>
            <CityNm>Atlanta</CityNm>
            <StateAbbreviationCd>GA</StateAbbreviationCd>
            <ZIPCd>303843412</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Security</ServicesDesc>
        <CompensationAmt>425894</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Internet Archive</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>300 Funson Avenue</AddressLine1Txt>
            <CityNm>San Francisco</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>94118</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Digitization</ServicesDesc>
        <CompensationAmt>383570</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Massachusetts Library System</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>33 Boston Post Road WEST</AddressLine1Txt>
            <AddressLine2Txt>Suite 400</AddressLine2Txt>
            <CityNm>Marlborough</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>01752</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Cataloging</ServicesDesc>
        <CompensationAmt>324058</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Boston Library Consortium</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>31 Hayward St</AddressLine1Txt>
            <AddressLine2Txt>Suite 2F</AddressLine2Txt>
            <CityNm>Franklin</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02038</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>Cataloging,Membership and Resource Assessments</ServicesDesc>
        <CompensationAmt>259968</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>11</CntrctRcvdGreaterThan100KCnt>
      <InfoInScheduleOPartVIIIInd>X</InfoInScheduleOPartVIIIInd>
      <FederatedCampaignsAmt>0</FederatedCampaignsAmt>
      <MembershipDuesAmt>0</MembershipDuesAmt>
      <FundraisingAmt>0</FundraisingAmt>
      <RelatedOrganizationsAmt>4338349</RelatedOrganizationsAmt>
      <GovernmentGrantsAmt>5427430</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>1006765</AllOtherContributionsAmt>
      <NoncashContributionsAmt>0</NoncashContributionsAmt>
      <TotalContributionsAmt>10772544</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>NETWORK MEMBERSHIP DUES</Desc>
        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>129365</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>129365</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <TotalOthProgramServiceRevGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </TotalOthProgramServiceRevGrp>
      <TotalProgramServiceRevenueAmt>129365</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>1535875</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>1535875</ExclusionAmt>
      </InvestmentIncomeGrp>
      <IncmFromInvestBondProceedsGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
      </IncmFromInvestBondProceedsGrp>
      <RoyaltiesRevenueGrp>
        <TotalRevenueColumnAmt>16750</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>16750</ExclusionAmt>
      </RoyaltiesRevenueGrp>
      <GrossRentsGrp>
        <RealAmt>2423750</RealAmt>
        <PersonalAmt>0</PersonalAmt>
      </GrossRentsGrp>
      <LessRentalExpensesGrp>
        <RealAmt>0</RealAmt>
        <PersonalAmt>0</PersonalAmt>
      </LessRentalExpensesGrp>
      <RentalIncomeOrLossGrp>
        <RealAmt>2423750</RealAmt>
        <PersonalAmt>0</PersonalAmt>
      </RentalIncomeOrLossGrp>
      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>2423750</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>2423750</ExclusionAmt>
      </NetRentalIncomeOrLossGrp>
      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>22139342</SecuritiesAmt>
        <OtherAmt>0</OtherAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>19838518</SecuritiesAmt>
        <OtherAmt>0</OtherAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>2300824</SecuritiesAmt>
        <OtherAmt>0</OtherAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>2300824</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>2300824</ExclusionAmt>
      </NetGainOrLossInvestmentsGrp>
      <ContriRptFundraisingEventAmt>0</ContriRptFundraisingEventAmt>
      <OtherRevenueMiscGrp>
        <Desc>Commissions(event$467,407,Other $255)</Desc>
        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>467662</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>467662</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>McGovern Trust Fund Distribution</Desc>
        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>100241</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>100241</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>PayForPrint</Desc>
        <BusinessCd>611710</BusinessCd>
        <TotalRevenueColumnAmt>43282</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>43282</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <MiscellaneousRevenueGrp>
        <TotalRevenueColumnAmt>3092</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>3092</ExclusionAmt>
      </MiscellaneousRevenueGrp>
      <OtherRevenueTotalAmt>614277</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>17793385</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>129365</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>6891476</ExclusionAmt>
      </TotalRevenueGrp>
      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <GrantsToDomesticOrgsGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
      </GrantsToDomesticOrgsGrp>
      <GrantsToDomesticIndividualsGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
      </GrantsToDomesticIndividualsGrp>
      <ForeignGrantsGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
      </ForeignGrantsGrp>
      <BenefitsToMembersGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
      </BenefitsToMembersGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </CompCurrentOfcrDirectorsGrp>
      <CompDisqualPersonsGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </CompDisqualPersonsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>3870497</TotalAmt>
        <ProgramServicesAmt>2864168</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1006329</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OtherSalariesAndWagesGrp>
      <PensionPlanContributionsGrp>
        <TotalAmt>232035</TotalAmt>
        <ProgramServicesAmt>171706</ProgramServicesAmt>
        <ManagementAndGeneralAmt>60329</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <OtherEmployeeBenefitsGrp>
        <TotalAmt>331536</TotalAmt>
        <ProgramServicesAmt>245337</ProgramServicesAmt>
        <ManagementAndGeneralAmt>86199</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>0</TotalAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesManagementGrp>
        <TotalAmt>0</TotalAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesManagementGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>0</TotalAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>36000</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>36000</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesLobbyingGrp>
        <TotalAmt>0</TotalAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesLobbyingGrp>
      <FeesForServicesProfFundraising>
        <TotalAmt>0</TotalAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesProfFundraising>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>235065</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>235065</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForSrvcInvstMgmntFeesGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>1585881</TotalAmt>
        <ProgramServicesAmt>1173552</ProgramServicesAmt>
        <ManagementAndGeneralAmt>412329</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </FeesForServicesOtherGrp>
      <AdvertisingGrp>
        <TotalAmt>8407</TotalAmt>
        <ProgramServicesAmt>6221</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2186</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>940724</TotalAmt>
        <ProgramServicesAmt>696136</ProgramServicesAmt>
        <ManagementAndGeneralAmt>244588</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>1415631</TotalAmt>
        <ProgramServicesAmt>1047567</ProgramServicesAmt>
        <ManagementAndGeneralAmt>368064</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </InformationTechnologyGrp>
      <RoyaltiesGrp>
        <TotalAmt>0</TotalAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </RoyaltiesGrp>
      <OccupancyGrp>
        <TotalAmt>0</TotalAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>103832</TotalAmt>
        <ProgramServicesAmt>76836</ProgramServicesAmt>
        <ManagementAndGeneralAmt>26996</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </TravelGrp>
      <PymtTravelEntrtnmntPubOfclGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </PymtTravelEntrtnmntPubOfclGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>158546</TotalAmt>
        <ProgramServicesAmt>117324</ProgramServicesAmt>
        <ManagementAndGeneralAmt>41222</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </ConferencesMeetingsGrp>
      <InterestGrp>
        <TotalAmt>0</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </InterestGrp>
      <PaymentsToAffiliatesGrp>
        <TotalAmt>846523</TotalAmt>
        <ProgramServicesAmt>626427</ProgramServicesAmt>
        <ManagementAndGeneralAmt>220096</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </PaymentsToAffiliatesGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>116502</TotalAmt>
        <ProgramServicesAmt>86211</ProgramServicesAmt>
        <ManagementAndGeneralAmt>30291</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>18917</TotalAmt>
        <ProgramServicesAmt>0</ProgramServicesAmt>
        <ManagementAndGeneralAmt>18917</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Books and related materials</Desc>
        <TotalAmt>2751701</TotalAmt>
        <ProgramServicesAmt>2751701</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Equipment rental/Maintenance/Facilities</Desc>
        <TotalAmt>1569549</TotalAmt>
        <ProgramServicesAmt>1161466</ProgramServicesAmt>
        <ManagementAndGeneralAmt>408083</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Program/Admin</Desc>
        <TotalAmt>1355732</TotalAmt>
        <ProgramServicesAmt>1355732</ProgramServicesAmt>
        <ManagementAndGeneralAmt>0</ManagementAndGeneralAmt>
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        <ExplanationTxt>EXPLANATION: TERMS FOR NOT REPORTING ASSETS PER SFAS 116 -THE LIBRARY MAINTAINS COLLECTIONS INCLUDING ARTWORK, RARE BOOKS COLLECTIONS AND HISTORICAL TREASURES THAT HAVE BEEN PURCHASED OR DONATED. THESE ITEMS ARE PRESERVED AND CARED FOR AND MANY ARE DISPLAYED IN PUBLIC EXHIBITIONS. THE LIBRARY DOES NOT HAVE A FORMAL POLICY THAT REQUIRES PROCEEDS FROM THE SALE OF THESE ITEMS TO BE USED TO EXPAND THE COLLECTIONS THROUGH ADDITIONAL ACQUISITIONS. HOWEVER, HISTORICALLY, THE LIBRARY HAS NOT SOLD WORKS OF ARTS AND HISTORICAL TREASURES. AS OF JUNE 30, 2024, THE LIBRARY HAD NO INTENTION TO SELL COLLECTIONS OR USE PROCEEDS TO RESTORE CURRENT HOLDINGS OR EXPAND THE COLLECTION THROUGH ADDITIONAL ACQUISITIONS-----IN ADDITION-FORM 990 SCHEDULE D, PART XIII-EXPLANATION: PART XIII SUPPLEMENTAL FINANCIAL INFORMATION THE LIBRARY IS A PUBLIC ENTITY AND THEREFORE DOES NOT FOLLOW FASB PRONOUNCEMENTS ISSUED AFTER NOVEMBER 30, 1989.</ExplanationTxt>
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        <ExplanationTxt>DESCRIPTION OF COLLECTIONS AND HOW THEY FURTHER EXEMPT STATUS---LIBRARY BOASTS OVER ONE MILLION RARE BOOKS AND MANUSCRIPTS, A WEALTH OF MUSICAL SCORES AND PRINTS. AMONG ITS LARGE COLLECTIONS, THE LIBRARY HOLDS SEVERAL FIRST EDITION FOLIOS BY WILLIAM SHAKESPEARE, ORIGINAL MUSIC FROM MOZART TO PROKOFIEV'S "PETER AND THE WOLF", AND IN ITS RARE BOOK COLLECTIONS, THE PERSONAL LIBRARY OF JOHN ADAMS. DUE TO THE EXTENT OF THE COLLECTIONS, MANY ITEMS ARE DISPLAYED ON A ROTATING BASIS. THESE UNIQUE SPECIAL EXHIBITS ARE SHOWN IN THE RESEARCH LIBRARY AND OFFER THE PUBLIC AN OPPORTUNITY TO VIEW BOOKS AND SPECIAL DOCUMENTS WHICH ARE USUALLY ONLY ACCESSIBLE TO REGISTERED READERS IN THE RARE BOOKS READING ROOM.</ExplanationTxt>
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        <ExplanationTxt>ENDOWMENT FUNDS-ITEM '1B' LABELED CONTRIBUTIONS ARE AMOUNTS ADDED TO THE ENDOWMENT FUNDS FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
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        <ExplanationTxt>ENDOWMENT FUNDS-ITEM '1C' LABELED NET INVESTMENTS EARNINGS, GAINS, AND LOSSES SHOWS ACTUAL INCREASE OR DECREASE IN INVESTMENTS FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
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        <ExplanationTxt>ENDOWMENT FUNDS-ITEM '1D' LABELED GRANTS OR SCHOLARSHIPS SHOWS 5% DISTRIBUTION WITHDRAWN FROM THE ENDOWMENT FUNDS FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
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        <ExplanationTxt>ENDOWMENT FUNDS-ITEM '1E' LABELED OTHER EXPENDITURES FOR FACILITIES AND PROGRAMS SHOWS DISTRIBUTION TO TRINITY CHURCH IN THE CITY OF BOSTON FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
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        <ExplanationTxt>INTENDED USES FOR ENDOWMENT FUNDS- THEY ARE USED TO SUPPORT THE ACTIVITIES AND PROGRAMS OF THE PUBLIC LIBRARY OF THE CITY OF BOSTON.</ExplanationTxt>
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        <NontaxableBenefitsRltdOrgsAmt>1947</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>19102</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>143012</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>SARAH ZAPHIRIS</PersonNm>
        <TitleTxt>CHIEF OF STAFF &amp; STRATEGY, EFFECTIVE NOVEMBER 2021</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>144220</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>2722</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>13225</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>3603</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>163770</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>KEITH ALLEN GILLETTE</PersonNm>
        <TitleTxt>CHIEF TECHNOLOGY OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>144220</CompensationBasedOnRltdOrgsAmt>
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        <OtherCompensationRltdOrgsAmt>2450</OtherCompensationRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>27591</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>187461</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JOELLE LONG</PersonNm>
        <TitleTxt>SUPVERVISOR OF CIRCULATION AND SHELVING</TitleTxt>
        <BaseCompensationFilingOrgAmt>2867</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>140507</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>20</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>980</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>43</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>2100</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>13187</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>11755</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>2930</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>168529</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>EMILY TOKARCZYK</PersonNm>
        <TitleTxt>Chief Financial Officer (CFO) (effective July 2023)</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>124731</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>2241</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>11427</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>27285</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>165684</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION FOR CEO/EXECUTIVE DIRECTORS IS SET BY THE CITY OF BOSTON'S HUMAN RESOURCES DEPARTMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="R000006" softwareId="23018249" softwareVersionNum="v1.00">
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Boston Red Sox Tickets</Desc>
        <ContributionCnt>1600</ContributionCnt>
        <NoncashContributionsRptF990Amt>73450</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Fair Market Value (See note)</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>1</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I, Line 32b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Library receives during the year donations of used books which are sent to a third party that sells them and sends the proceeds to the Library. The revenue received for these are very small.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="R000007" softwareId="23018249" softwareVersionNum="v1.00">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IV, Line 29</FormAndLineReferenceDesc>
        <ExplanationTxt>RECEIVED MORE THAN $25,000 IN NON-CASH CONTRIBUTION-THE BOSTON RED SOX ORGANIZATION DONATED GAME TICKETS WITH AN ESTIMATED FAIR MARKET VALUE OF $73,450 TO THE BOSTON PUBLIC LIBRARY. THE LIBRARY ALSO RECEIVED USED BOOK DONATIONS DURING THE YEAR WHICH ARE SENT TO A THIRD-PARTY VENDOR TO SELL AND SEND THE PROCEEDS TO THE LIBRARY FOR WHICH $129.57 WAS RECEIVED AND POSTED AS REVENUE. PLEASE NOTE ALSO THAT THE FEDERAL COMMUNICATIONS COMMISSION (FCC) "ERATE" PROGRAM HAS BEEN SUPPORTING THE OPERATING COSTS RELATED TO THE BOSTON PUBLIC LIBRARY'S INFORMATION TECHNOLOGY INFRASTRUCTURE. THIS MONEY IS PAID BY THE FCC DIRECTLY TO BPL VENDORS AND IS INCLUDED IN THE BPL'S AUDITED FINANCIAL STATEMENTS. FOR BPL'S FISCAL YEAR 2024 $371,520 HAS BEEN PAID OUT TO BPL VENDORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part V, Line 2a</FormAndLineReferenceDesc>
        <ExplanationTxt># OF EMPLOYEES REPORTED ON FORM W-3-THE 568 LISTED HERE IS THE TOTAL # OF EMPLOYEES PAID UNDER THE LIBRARY DEPARTMENT FOR CALENDAR YEAR 2023. THE CITY OF BOSTON PROCESSES THE ENTIRE PAYROLL FOR THE LIBRARY AND FILES THE W-3 TRANSMITTAL OF WAGE AND TAX STATEMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part V, Line 2b</FormAndLineReferenceDesc>
        <ExplanationTxt>FILINGS OF ALL REQUIRED FEDERAL EMPLOYMENT TAX RETURNS-THE CITY OF BOSTON PROCESSES THE LIBRARY'S ENTIRE PAYROLL. THEY ALSO FILE ALL THE REQUIRED UNEMPLOYMENT TAX RETURNS FOR THE LIBRARY UNDER THE CITY OF BOSTON FEDERAL ID.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 8a</FormAndLineReferenceDesc>
        <ExplanationTxt>CONTEMPORANEOUSLY DOCUMENT THE MEETINGS HELD OR WRITTEN ACTIONS UNDERTAKEN DURING THE YEAR BY THE GOVERNING BODY-THE CLERK TAKES THE MINUTES OF ALL THE TRUSTEE MEETINGS AND COMMITTEE MEETINGS AND ONCE THE MINUTES ARE APPROVED THEY ARE POSTED ON THE LIBRARY'S WEBSITE: BPL.ORG.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 8b</FormAndLineReferenceDesc>
        <ExplanationTxt>CONTEMPORANEOUSLY DOCUMENT THE MEETINGS HELD OR WRITTEN ACTIONS UNDERTAKEN DURING THE YEAR BY EACH COMMITTEE WITH AUTHORITY TO ACT ON BEHALF OF THE LIBRARY -THE CLERK TAKES THE MINUTES OF ALL THE TRUSTEE MEETINGS AND COMMITTEE MEETINGS AND ONCE THE MINUTES ARE APPROVED THEY ARE POSTED ON THE LIBRARY'S WEBSITE: BPL.ORG.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS TO REVIEW FORM 990-A DRAFT OF FORM 990 WAS PROVIDED TO THE GOVERNING BODY FOR REVIEW AND APPROVAL BEFORE IT WAS FILED. THIS FORM 990 IS PREPARED/REVIEWED/FILED BY THE ASSISTANT PRINCIPAL ACCOUNTANT. IT IS ALSO REVIEWED AND APPROVED BY THE SUPERVISOR OF ACCOUNTING AND THE CHIEF FINANCIAL OFFICER. ALL THE FINANCIAL NUMBERS LISTED ON THEM CORRESPONDS TO THE AUDITED FINANCIAL STATEMENT TOTALS. ACCOUNTING SCHEDULES HAVE BEEN CREATED TO BACK UP ALL THE DATA ENTERED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>REGULARLY AND CONSISTENTLY MONITOR AND ENFORCE COMPLIANCE WITH CONFLICT OF INTEREST POLICY- ALL EMPLOYEES ARE PROVIDED A SUMMARY OF THE CONFLICT OF INTEREST LAW AND MUST SIGN AND COMPLETE AN ACKNOWLEDGEMENT OF ITS RECEIPT AT TIME OF HIRE AND ANNUALLY THEREAFTER. ALSO, WITHIN THE FIRST 30 DAYS OF HIRE AND EVERY 2 YEARS THEREAFTER THEY ARE REQUIRED TO COMPLETE AN ONLINE TRAINING PROGRAM AT HTTP://WWW.MUNIPROG.ETH.STATE.MA.US/</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 13</FormAndLineReferenceDesc>
        <ExplanationTxt>WRITTEN WHISTLEBLOWER POLICY-ALL PUBLIC ENTITIES ARE COVERED BY STATE LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 14</FormAndLineReferenceDesc>
        <ExplanationTxt>WRITTEN DOCUMENT RETENTION AND DESTRUCTION POLICY-ALL PUBLIC ENTITIES ARE COVERED BY STATE LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS FOR DETERMINING COMPENSATION FOR CEO, EXECUTIVE DIRECTOR OR TOP MANAGEMENT-THE COMPENSATION FOR OFFICERS AND KEY EMPLOYEES ARE SET BY THE CITY OF BOSTON'S HUMAN RESOURCES DEPARTMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>WAYS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS WERE MADE AVAILABLE-ALL GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS ARE AVAILABLE ON THE LIBRARY'S WEBSITE: BPL.ORG. ALL POLICIES INCLUDING CONFLICT OF INTEREST POLICY ARE AVAILABLE ON THE CITY'S HUB WHICH ALL EMPLOYEES HAVE ACCESS TO AND THEY ARE ALSO INCLUDED ON THE CITY OF BOSTON EMPLOYEE HANDBOOK.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section B, Line 1(C)</FormAndLineReferenceDesc>
        <ExplanationTxt>INDEPENDENT CONTRACTORS-$ AMOUNTS LISTED FOR INDEPENDENT CONTRACTORS IS FOR CALENDAR YEAR 2023.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 1d</FormAndLineReferenceDesc>
        <ExplanationTxt>RELATED ORGANIZATIONS-LISTED HERE AMOUNTS RECEIVED DIRECTLY FROM THE BOSTON PUBLIC LIBRARY FUND INC. $3,223,126 of WHICH $501,713 THE LIBRARY PAID OUT TO THE NORMAN B. LEVENTHAL MAP &amp; EDUCATION CENTER INC. AND FROM THE ASSOCIATES OF THE BOSTON PUBLIC LIBRARY INC. $1,115,223 GRAND TOTAL $4,338,349.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 2a - 2e</FormAndLineReferenceDesc>
        <ExplanationTxt>PROGRAM SERVICE REVENUE-AMOUNT LISTED HERE $129,365 NEXT TO THE HEADING 'NETWORK MEMBERSHIP DUES' IS MEMBERSHIP DUES PAID BY OTHER ORGANIZATIONS WHOSE MEMBERS/PATRONS USE THE METRO BOSTON LIBRARY NETWORK SYSTEM (MBLN).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 5</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION OF CURRENT OFFICERS, DIRECTORS, TRUSTEES, AND KEY EMPLOYEES- LISTED HERE $0 BECAUSE THE CITY OF BOSTON PROCESSES AND PAYS FOR ALL OF THE LIBRARY'S PAYROLL EXPENDITURES TO ITS EMPLOYEES. THE LIBRARY THEN REIMBURSES THE CITY OF BOSTON A PORTION OF THE TOTAL PAYROLL EXPENDITURES PAID BY GIFTS &amp; GRANTS WHICH IS LISTED ON FORM 990 PART IX LINE 7. THE LIBRARY DOES NOT COMPENSATE ANY OF ITS TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER SALARIES AND WAGES-THE $ AMOUNT LISTED HERE IS THE PORTION OF THE TOTAL PAYROLL SALARY EXPENDITURES THE LIBRARY REIMBURSED THE CITY OF BOSTON.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 8</FormAndLineReferenceDesc>
        <ExplanationTxt>PENSION PLAN ACCRUALS AND CONTRIBUTIONS-THE $ AMOUNT LISTED HERE IS THE PORTION OF PENSION BENEFITS THE LIBRARY REIMBURSED THE CITY OF BOSTON.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER EMPLOYEE BENEFITS-THE $ AMOUNT LISTED HERE IS THE PORTION OF OTHER EMPLOYEE BENEFITS THE LIBRARY REIMBURSED THE CITY OF BOSTON.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 10</FormAndLineReferenceDesc>
        <ExplanationTxt>PAYROLL TAXES-LISTED HERE $0 FOR PAYROLL TAXES BECAUSE THE CITY OF BOSTON PROCESSES AND PAYS THIS EXPENSE FOR ALL LIBRARY EMPLOYEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 12</FormAndLineReferenceDesc>
        <ExplanationTxt>Advertising &amp; Promotions-Not included on the total $8,407 is $14,127 in adverting costs included on Form 990, Part IX, line 24a Books &amp; related materials.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 17</FormAndLineReferenceDesc>
        <ExplanationTxt>Travel-Not included on the $103,832 is $144,555 for vehicle lease rentals, maintenance and parking for the shipping department which are included on Form 990, Part IX, Line 24b Equipment rental/Maintenance/Facilities.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 21</FormAndLineReferenceDesc>
        <ExplanationTxt>PAYMENTS TO AFFILIATES-$846,522.60 WAS PAID TO THE NORMAN B. LEVENTHAL MAP &amp; EDUCATION CENTER INC. OF WHICH $661,212.70 CAME FROM THE BOSTON PUBLIC LIBRARY FUND INC. AND $185,309.90 FROM THE LIBRARY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 23</FormAndLineReferenceDesc>
        <ExplanationTxt>INSURANCE-$18,916.75 TOTAL EXPENDED IN INSURANCE COSTS CONSISTS OF CAR INSURANCE $16,296.00, EXECUTIVES LIABILITY INSURANCE $1220.75 AND DISHONEST EMPLOYEE INSURANCE $1400.00.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 24a - 24d</FormAndLineReferenceDesc>
        <ExplanationTxt>Other expenses-Line 24a-Books and related materials-Included on the total $2,751,701 is $14,127 for advertising and on Line 24b-Equipment rental/maintenance/facilities is $144,555 for vehicle lease rentals,maintenance and parking for the shipping department.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER CHANGES IN NET ASSETS OR FUND BALANCES--THE FEDERAL COMMUNICATIONS COMMISSION (FCC) "ERATE" PROGRAM HAS FOR YEARS BEEN SUPPORTING THE OPERATING COSTS RELATED TO THE BOSTON PUBLIC LIBRARY'S INFORMATION TECHNOLOGY INFRASTRUCTURE. THE "ERATE" PROGRAM IS ADMINISTERED BY THE UNIVERSAL SERVICE ADMINISTRATION COMPANY. THIS MONEY IS PAID DIRECTLY TO BPL VENDORS AND SINCE 2021 HAS BEEN INCLUDED IN THE BPL AUDITED FINANCIAL STATEMENTS. IN FISCAL YEAR 2024 $371,520 WAS PAID OUT TO BPL VENDORS. ALSO INCLUDED HERE IS $6,257 FOR NONPROFITS ACCOUNTING FOR LEASES.</ExplanationTxt>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>BOSTON PUBLIC LIBRARY FUND INC</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>700 BOYLSTON STREET</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02116</ZIPCd>
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        <EIN>043150560</EIN>
        <PrimaryActivitiesTxt>FUNDRAISING FOR BPL</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>ASSOCIATES OF THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
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          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02116</ZIPCd>
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        <EIN>042900822</EIN>
        <PrimaryActivitiesTxt>FUNDRAISING FOR BPL</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
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          <BusinessNameLine1Txt>THE CITY OF BOSTON</BusinessNameLine1Txt>
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          <AddressLine1Txt>ONE CITY HALL SQUARE</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02116</ZIPCd>
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        <PrimaryActivitiesTxt>CITY GOVERNMENT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
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      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
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      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
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          <BusinessNameLine1Txt>BOSTON PUBLIC LIBRARY FUND INC</BusinessNameLine1Txt>
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        <InvolvedAmt>3223126</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACTUAL $</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>BOSTON PUBLIC LIBRARY FUND INC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>n</TransactionTypeTxt>
        <InvolvedAmt>48046</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FAIR MARKET VALUE</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>ASSOCIATES OF THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
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        <TransactionTypeTxt>c</TransactionTypeTxt>
        <InvolvedAmt>1115223</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>ACTUALS $</MethodOfAmountDeterminationTxt>
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      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>ASSOCIATES OF THE BOSTON PUBLIC LIBRARY INC</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>n</TransactionTypeTxt>
        <InvolvedAmt>11139</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>FAIR MARKET VALUE</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule R, Part V, Line 1c</FormAndLineReferenceDesc>
        <ExplanationTxt>Gift, Grant, or capital contribution from related organization(s)-The Boston Public Library received $3,223,126 from The Boston Public Library Fund Inc. of which $ 501,713 the Library paid out to the Norman B. Leventhal Map &amp; Education Center Inc. and $ 1,115,223 from The Associates Of The Boston Public Library Inc. to support library operations. In fiscal year 2024 operating under the Library's fed Id # 04-6151731 expenses totaled about $16.5 million (see schedule D Part XII Line 1). The Library also operates as a separate department within the City Of Boston operations, with fiscal year 2024 expenses totaling about $47 million (see City Of Boston's fy24 comprehensive financial statements on their website).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule R, Part V, Line 1n</FormAndLineReferenceDesc>
        <ExplanationTxt>Sharing of facilities, equipment, mailing lists, or other assets with related organization(s)-The Boston Public Library provided at the Copley location free rent space to The Boston Public Library Fund Inc. with an estimated fair market value of $48,046.75 and to the Associates Of The Boston Public Library Inc. free rent space with an estimated fair market value of $11,139.00. The Norman B. Leventhal Map &amp; Education Center Inc., an affiliate of the BPL was also provided free rent space at the Copley location with an estimated fair market value of $163,630.50.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
  </ReturnData>
</Return>