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      <RevenueNotReportedAmt>2167830</RevenueNotReportedAmt>
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      <TotExpnsEtcAuditedFinclStmtAmt>10061175</TotExpnsEtcAuditedFinclStmtAmt>
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        <FormAndLineReferenceDesc>Schedule D, Part III, Line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>EXPLANATION: TERMS FOR NOT REPORTING ASSETS PER SFAS 116. THE LIBRARY MAINTAINS COLLECTIONS INCLUDING ARTWORK, RARE COLLECTION BOOKS AND HISTORICAL TREASURERS 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, 2017, 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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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part III, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>THE LIBRARY BOASTS OVER ONE MILLION RARE BOOKS AND MANUSCRIPTS, A WEALTH OF MAPS, 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 WOLFE", AND IN ITS RARE BOOK COLLECTION, THE PERSONAL LIBRARY OF JOHN ADAMS. DUE TO THE EXTENT OF THE COLLECTIONS, MANY ITEMS ARE DISPLAYED ON A ROTATING BASIS. THESE UNIQUE SPECIAL EXIBITS ARE SHOWN IN THE RESEARCH LIBRARY AND OFFER THE PUBLIC AN OPPERTUNITY 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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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 1c</FormAndLineReferenceDesc>
        <ExplanationTxt>ITEM '1C' LABELED NET INVESTMENTS EARNINGS, GAINS, AND LOSSES NOW SHOWS ACTUAL INCREASE IN INVESTMENTS FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 1d</FormAndLineReferenceDesc>
        <ExplanationTxt>ITEM '1D' LABELED GRANTS OR SCHOLARSHIPS NOW SHOWS 5% DISTRIBUTION WITHDRAWN FROM THE ENDOWMENT INVESTMENTS FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 1e</FormAndLineReferenceDesc>
        <ExplanationTxt>ITEM '1E' LABELED OTHER EXPENDITURES FOR FACILITIES AND PROGRAMS NOW SHOWS DISTRIBUTION TO TRINITY CHURCH IN THE CITY OF BOSTON FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 1f</FormAndLineReferenceDesc>
        <ExplanationTxt>ITEM '1F' LABELED ADMINISTRATIVE EXPENSES NOW SHOWS ACTUAL EXPENSES FOR CURRENT AND ALL PRIOR YEARS LISTED HERE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part V, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>ENDOWMENT FUNDS ARE USED TO SUPPORT THE ACTIVITIES AND PROGRAMS OF THE PUBLIC LIBRARY OF THE CITY OF BOSOTN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part XI, Line 2d</FormAndLineReferenceDesc>
        <ExplanationTxt>SALE/DISPOSTITON OF ASSETS WHICH THE PROCEEDS FROM THE SALE WAS PAID DIRECTLY TO THE CITY OF BOSTON.</ExplanationTxt>
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        <PersonNm>DAVID J LEONARD</PersonNm>
        <TitleTxt>President</TitleTxt>
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        <TotalCompensationRltdOrgsAmt>203326</TotalCompensationRltdOrgsAmt>
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        <PersonNm>MICHAEL R COLFORD</PersonNm>
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        <PersonNm>JAMES P MEADE</PersonNm>
        <TitleTxt>Superrintendent Of Library Buildings</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ELLEN DONAGHEY</PersonNm>
        <TitleTxt>Chief Financial Officer (CFO)</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>128028</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>11523</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>19515</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>159066</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION FOR CEO/EXECUTIVE DIRECTORS ARE SET BY THE CITY OF BOSTON'S HUMAN RESOURCES DEPARTMENT.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IV, Line 29</FormAndLineReferenceDesc>
        <ExplanationTxt>BEGINNING IN FY 1999 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 DIRECLTY TO BPL VENDORS AND IS NOT INCLUDED IN THE BPL'S AUDITED FINANCIAL STATEMENTS. IN FY 2016 THE FCC COMMITTED AN ESTIMATED $827,000 FOR WHICH $769,000 HAS BEEN PAID OUT TO BPL VENDORS SO FAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A DRAFT OF FORM 990 WAS PROVIDED TO THE GOVERNING BODY FOR REVIEW BEFORE IT WAS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>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 16a</FormAndLineReferenceDesc>
        <ExplanationTxt>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>ALL GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS ARE AVAILABLE ON THE LIBRARY'S WEBSITE: BPL.ORG. ALL POLICIES INCLUDING THE 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 IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>CATALOGING $304,956, PRINT DEPARTMENT CATALOGING $227,983, DIGITIZATION SERVICES $175,220, CLERICAL/OFFICE ADMIN $126,209, CONSERVATION/RESTORATION $78,150, SNOW REMOVAL $31,135, MAINTENANCE/FACILITIES $27,365, LANDSCAPING $22,031, PROGRAM SERVICES $12,871, DESIGN SERVICES $7,092.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part X, Line 10c</FormAndLineReferenceDesc>
        <ExplanationTxt>FIXED ASSET HAS BEEN REDUCED CONSIDERABLY THIS YEAR DUE TO THE SALE OF NORWOOD FACILITY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SALE AND DISPOSITION OF THE NORWOOD FACILITY AND REMOVAL OF OTHER MISCELLANEOUS ASSETS IN WHICH THE PROCEEDS FROM THE SALE WAS PAID OUT DIRECTLY TO THE CITY OF BOSTON.</ExplanationTxt>
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          <AddressLine1Txt>700 BOYLSTON STREET</AddressLine1Txt>
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          <StateAbbreviationCd>MA</StateAbbreviationCd>
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          <BusinessNameLine1Txt>ASSOCIATES OF THE BOSTON PUBLIC LIBRARY INCORPORATED</BusinessNameLine1Txt>
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          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02116</ZIPCd>
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          <AddressLine1Txt>ONE CITY HALL SQUARE</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02116</ZIPCd>
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        <MethodOfAmountDeterminationTxt>THE BOSTON PUBLIC LIBRARY IS PAYING THE SALARY FOR A STAFF MEMBER IN THE BOSTON PUBLIC LIBRARY FOUNDATION.</MethodOfAmountDeterminationTxt>
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