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      <RevenueSubtotalAmt>3305685</RevenueSubtotalAmt>
      <InvestmentExpensesNotIncldAmt>6489</InvestmentExpensesNotIncldAmt>
      <RevenueNotReportedFinclStmtAmt>6489</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>3312174</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>5453117</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>719580</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>-1669</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>717911</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>4735206</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>6489</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>6489</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>4741695</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>BCA 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 FINANCIAL STATEMENTS REGARDING A TAX POSITION THAT IS TAKEN, OR IS EXPECTED TO BE TAKEN, IN A TAX RETURN. BCA HAS DETERMINED THAT THERE ARE NO UNCERTAIN TAX POSITIONS THAT QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS AT JUNE 30, 2024. BCA'S INFORMATIONAL RETURNS ARE SUBJECT TO EXAMINATION BY FEDERAL AND STATE JURISDICTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT -1,669.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>SPECIAL EVENT -1,669.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>990 SCHEDULE D PART V LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>NET ASSETS WITH DONOR RESTRICTIONS HELD IN PERPETUITY REPRESENT AMOUNTS THAT HAVE BEEN RESTRICTED BY DONORS AGAINST ANY EXPENDITURES OF PRINCIPAL, BUT ALL INVESTMENT INCOME EARNED ON THE PRINCIPAL MAY BE USED TO SUPPORT THE CYCLORAMA FACILITY.</ExplanationTxt>
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          <BusinessNameLine1Txt>ELPIS</BusinessNameLine1Txt>
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          <AddressLine1Txt>50 GRIGGS ROAD</AddressLine1Txt>
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          <StateAbbreviationCd>MA</StateAbbreviationCd>
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        <GrossReceiptsAmt>0</GrossReceiptsAmt>
        <RetainedByContractorAmt>93500</RetainedByContractorAmt>
        <NetToOrganizationAmt>-93500</NetToOrganizationAmt>
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      <FundraiserActivityInfoGrp>
        <OrganizationBusinessName>
          <BusinessNameLine1Txt>MELISSA GALLIN</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>640 WASHINGTON ST UNIT 3</AddressLine1Txt>
          <CityNm>BROOKLINE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02446</ZIPCd>
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        <ActivityTxt>DEVELOPMENT CONSULTING</ActivityTxt>
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        <Event1Nm>BOSTON ART BOOK FAIR</Event1Nm>
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        <GrossRevenueEvent1Amt>13607</GrossRevenueEvent1Amt>
        <RentFacilityCostsEvent1Amt>13607</RentFacilityCostsEvent1Amt>
        <OtherDirectExpensesEvent1Amt>5264</OtherDirectExpensesEvent1Amt>
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        <GrossRevenueTotalEventsAmt>13607</GrossRevenueTotalEventsAmt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>21384</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>170470</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <PersonNm>EMILY DAY</PersonNm>
        <TitleTxt>CO-ED (UNTIL 4/2024)</TitleTxt>
        <BaseCompensationFilingOrgAmt>151081</BaseCompensationFilingOrgAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>A COPY OF FORM 990 WAS PROVIDED TO BCA'S GOVERNING BODY FOR REVIEW AND APPROVAL BEFORE IT WAS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>BCA REGULARLY AND CONSISTENTLY MONITORS AND ENFORCES COMPLIANCE WITH THE CONFLICT OF INTEREST POLICY THROUGH ANNUAL CONFLICT OF INTEREST STATEMENTS SIGNED BY BOARD MEMBERS AND SENIOR MANAGEMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS FOR DETERMINING COMPENSATION OF BCA'S OFFICERS INCLUDED A REVIEW OF COMPENSATION DATA PROVIDED BY AN INDEPENDENT CONSULTANT AND APPROVAL BY THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>BCA MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THIS PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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</Return>