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        <FundraisingAmt>7257</FundraisingAmt>
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      <LandBldgEquipCostOrOtherBssAmt>838997</LandBldgEquipCostOrOtherBssAmt>
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        <EOYAmt>675156</EOYAmt>
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        <EOYAmt>1205910</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>0</EOYAmt>
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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>1051103</BOYAmt>
        <EOYAmt>996446</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>69200</BOYAmt>
        <EOYAmt>209464</EOYAmt>
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        <EOYAmt>1205910</EOYAmt>
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        <EOYAmt>1205910</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>50163</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>35444</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>true</AccountantCompileOrReviewInd>
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        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <FSAuditedInd>false</FSAuditedInd>
      <FederalGrantAuditRequiredInd>false</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="990A">
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        <CurrentTaxYearAmt>126933</CurrentTaxYearAmt>
        <TotalAmt>478599</TotalAmt>
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      <SubstantialContributorsTotAmt>36994</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>441605</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
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        <CurrentTaxYearAmt>20538</CurrentTaxYearAmt>
        <TotalAmt>182436</TotalAmt>
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      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>24706</CurrentTaxYearMinus4YearsAmt>
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        <TotalAmt>39115</TotalAmt>
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      <TotalSupportAmt>700150</TotalSupportAmt>
      <PublicSupportCY170Pct>0.63070</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.62790</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
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    <IRS990ScheduleB documentId="990B">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
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          <AddressLine2>RESTRICTED</AddressLine2>
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          <State>RESTRICTED</State>
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    <IRS990ScheduleD documentId="990D">
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      <CollUsedScholarlyRsrchInd>X</CollUsedScholarlyRsrchInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <SolicitedAssetsSaleInd>false</SolicitedAssetsSaleInd>
      <CYEndwmtFundGrp>
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        <ContributionsAmt>25000</ContributionsAmt>
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        <EndYearBalanceAmt>93795</EndYearBalanceAmt>
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        <OtherExpendituresAmt>1583</OtherExpendituresAmt>
        <EndYearBalanceAmt>61373</EndYearBalanceAmt>
      </CYMinus1YrEndwmtFundGrp>
      <CYMinus2YrEndwmtFundGrp>
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        <EndYearBalanceAmt>12812</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <PrmnntEndowmentBalanceEOYPct>1.00000</PrmnntEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>false</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <BuildingsGrp>
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        <DepreciationAmt>303782</DepreciationAmt>
        <BookValueAmt>510911</BookValueAmt>
      </BuildingsGrp>
      <EquipmentGrp>
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        <DepreciationAmt>24304</DepreciationAmt>
      </EquipmentGrp>
      <TotalBookValueLandBuildingsAmt>510911</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>Other Marketable Securities</Desc>
        <BookValueAmt>675156</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <TotalBookValueSecuritiesAmt>675156</TotalBookValueSecuritiesAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Collections descriptions (Part III, line 4)</FormAndLineReferenceDesc>
        <ExplanationTxt>Preservation of the Gibson House and its artifacts as well as educating the public on victorian urban life.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Endowment funds intended uses (Part V, line 4)</FormAndLineReferenceDesc>
        <ExplanationTxt>Curator Endowment: It is funded by donations specifically raised to secure the long-term compensation of the curator. This endowment ensures the continuity and stability of the curator role, underscoring the museums commitment to curatorial excellence.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Footnote for uncertain tax position under FIN 48 (Part X)</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization has evaluated the tax positions taken on returns for open years and those expected to be taken on returns for the year ended September 30, 2023. It is Managements belief that such tax positions are more likely than not to be sustained upon examination by tax authorities. Accordingly, no liability for uncertain tax positions is reflected in these financial statements. Returns for tax years beginning with those filed for the year ended September 30, 2021 are open to examination.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
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        <OtherDirectExpensesEvent1Amt>13170</OtherDirectExpensesEvent1Amt>
        <Event2Nm>Raffle</Event2Nm>
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        <GrossRevenueEvent2Amt>8943</GrossRevenueEvent2Amt>
        <OtherEventsTotalCnt>1</OtherEventsTotalCnt>
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        <CharitableContriOtherEventsAmt>10223</CharitableContriOtherEventsAmt>
        <OthDirectExpnssOtherEventsAmt>264</OthDirectExpnssOtherEventsAmt>
        <GrossReceiptsTotalAmt>54946</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>10223</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>44723</GrossRevenueTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>13434</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>13434</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>31289</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleO documentId="990O">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Members or stockholder classes and rights Part VI line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization is governed by the Board of Directors.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990 governing body review Part VI line 11</FormAndLineReferenceDesc>
        <ExplanationTxt>The annual form 990 is prepared by the independent certified public accountant, reviewed by the Finance Committee and signed by the President.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Conflict of interest policy compliance Part VI line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization has established a policy that requires each new key employee, officer or director to review a copy of the Policy on Conflicts of Interest and Disclosure of Certain Interests and to acknowledge in writing that he or she has done so. Additionally, each key employee, officer or director, annually complete a disclusure form identifying any relationships, positions or cirsumstances in which the employee is involved that he or she believes could contribute to a conflict of interest arising.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>CEO executive director top management comp Part VI line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The salary of the Museum Administrator, who fulfills many duties akin to those of an Executive Director, is reviewed and approved by the Board of Directors during the annual budget process.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Governing documents etc available to public Part VI line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization makes its governing documents and conflict of interest policy available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III response or note to any other line in Part III</FormAndLineReferenceDesc>
        <ExplanationTxt>(continued from Form 990, page 2, Part III, Line 1)...in its urban context to provide education and enjoyment to the broadest possible audience; promoting knowledge of Back Bay history and material culture.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <ReasonableCauseExplanation documentId="RecExp">
      <ExplanationTxt>The late filing was due to an unfortunate and unforeseen circumstance that severely impacted our organization ability to comply with the filing deadline Specifically our organization president Ruth A Kupfer who was integral to our operations and compliance processes passed away unexpectedly on January 2024 while in the process of securing a new Certified Public Accountant to prepare and file our Form 990 Additionally this particular filing was very peculiar because for the first time our organization exceeded the $200K revenue threshold established by the Massachusetts Attorney General Office This new milestone required us to submit Reviewed Financial Statements prepared by an independent CPA in accordance with generally accepted accounting principles adding further complexity to the process Ruth Kupfer was not only the president of our organization but also the person who had been coordinating the financial and administrative functions as acting Executive Director Her sudden death left a significant void in our operations causing an unavoidable delay in our ability to meet the filing deadline The organization was deeply reliant on Ms Kupfer and her unexpected passing disrupted our transition to a new CPA further complicating our efforts to file the required documents on time Despite our best efforts to manage this tragic situation we were unable to secure and transition to a new CPA in time to meet the deadline The board of directors and remaining staff were focused on addressing immediate organizational needs and ensuring continuity of our programs which serve the community critical needs We have since engaged a new CPA and have filed the required Form 990 We are committed to ensuring timely filings in the future and have implemented additional checks and balances to avoid any such delays going forward Given these exceptional circumstances we respectfully request that the penalties for the late filing of our Form 990 be abated for a reasonable cause The organization has file timely tax returns for the last three years We believe that reasonable cause exists for the delay as described under IRS guidelines due to the sudden and unexpected death of our president which was beyond our control We appreciate your consideration of this request and look forward to your favorable response</ExplanationTxt>
    </ReasonableCauseExplanation>
  </ReturnData>
</Return>