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        <CurrentTaxYearAmt>2024</CurrentTaxYearAmt>
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        <FormAndLineReferenceDesc>STATEMENT REGARDING CHANGE OF ACCOUNTING PERIOD</FormAndLineReferenceDesc>
        <ExplanationTxt>PURSUANT TO REVENUE PROCEDURE 2023-26, THE NEW CANAAN HISTORICAL SOCIETY INC., EIN: 06-0272728, IS CHANGING ITS ANNUAL ACCOUNTING PERIOD. THE ORGANIZATION MEETS ALL THE REQUIREMENTS FOR AUTOMATIC APPROVAL UNDER REV. PROC. 2023-26, INCLUDING THAT IT HAS NOT CHANGED ITS ACCOUNTING PERIOD WITHIN THE PAST 10 YEARS AND IS NOT UNDER EXAMINATION BY THE IRS. THE ORGANIZATION'S PRIOR TAX YEAR ENDED ON JUNE 30, 2024, AND THE NEW TAX YEAR ENDS ON SEPTEMBER 30, 2025. THIS SHORT-PERIOD FORM 990 IS FILED FOR THE PERIOD FROM JULY 1, 2024 THROUGH SEPTEMBER 30, 2024 IN ACCORDANCE WITH THE PROCEDURES OUTLINED IN REV. PROC. 2023-26.</ExplanationTxt>
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        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <CollectionUsedPubExhibitionInd>X</CollectionUsedPubExhibitionInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <SolicitedAssetsSaleInd>0</SolicitedAssetsSaleInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>359202</OtherCostOrOtherBasisAmt>
        <BookValueAmt>359202</BookValueAmt>
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      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>3596552</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1380003</DepreciationAmt>
        <BookValueAmt>2216549</BookValueAmt>
      </BuildingsGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>646268</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>122658</DepreciationAmt>
        <BookValueAmt>523610</BookValueAmt>
      </OtherLandBuildingsGrp>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART 1 LINE 1; DESCRIPTION OF ORGANIZATION MISSION:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NEW CANAAN HISTORICAL SOCIETY MUSEUM TELLS THE STORY OF THE TOWN OF NEW CANAAN AND ITS GREATER COMMUNITY. THROUGH COLLECTIONS AND RESEARCH, PROGRAMS AND EVENTS. THE MUSEUM CELEBRATES HISTORY AND EXPLORES ITS IMPACT ON THE FUTURE. OUR MISSION ADDS TO THIS DIRECTIVE BY EMPHASIZING REASEARCH, PRESERVATION AND EDUCATION. OUR MOST SIGNIFICANT ACTIVITIES INCLUDE SCHOOL TOURS, A MODERN HOUSE DAY TOUR TO CELEBRATE MID CENTURY MODERN ARCHITECTURE AND NUMEROUS EXHIBITIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III LINE 4A, STATEMENT OF PROGRAM SERVICE ACCOMPLISHMENTS , CONTINUED-</FormAndLineReferenceDesc>
        <ExplanationTxt>PUBLICATIONS ON NEW CANAAN'S HISTORY. IT HAS THREE GALLERY SPACES AND PUTS ON EXHIBITIONS IN EACH OF THOSE VENUES. IT RUNS PROGRAMS , EVENTS AND LECTURES. THE LARGEST PROGRAMS FOR THE FISCIAL YEAR 2023 WERE: 1. OCTOBER 4 DESIGN A MONTH LONG SERVICES OF PROGRAMS, LECTURES AND ACTIVITIES INVOLVING ARCHITECTURE, ART AND DESIGN. 2. STEP INTO SUMMER - MAJOR SPRING FUNDRAISER 3. ICE CREAM SOCIAL- OUTREACH WHERE BY WE WELCOME MEMBERS OF THE COMMUNITY TO HAVE ICE CREAM AND LEARN MORE ABOUT WHAT IS OFFERED BY THE SOCIETY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>ANY PERSON OR FAMILY INTERESTED IN THE PURPOSES AND AIMS OF THE MUSEUM MAY BECOME A MEMBER UPON PAYMENT OF DUES, WITH ONE VOTE PER MEMBERSHIP (INDIVIDUAL OR FAMILY) IN PERSON OR BY PROXY, AT ANY MEETING OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>AT THE ANNUAL MEETING, THE GOVERNANCE COMMITTEE SHALL PRESENT A SLATE OF CANDIDATES FOR ELECTION TO THE BOARD OF GOVERNORS. THE ORGANIZATION'S MEMBERS SHALL ELECT SUCH NUMBER OF GOVERNORS AS SHALL CONSTITUTE A BOARD OF NOT LESS THAN 15 AND NOT MORE THAT 24 MEMBERS WHO SHALL BE ELECTED FOR A 3 YEAR TERM, WITH THE TERMS ARRANGED, AS FAR AS BEING PRACTICAL IN THE JUDGEMENT OF THE BOARD, SO THAT ONE THIRD OF THE BOARD IS SUBJECT TO ELECTION EACH YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BY-LAWS OF THE ORGANIZATION MAY BE AMENDED, ALTERED OR REPEALED BY A TWO THIRDS VOTE OF THE MEMBERS PRESENT AND VOTING, EITHER IN PERSON OR BY PROXY, AT ANY MEETING A QUORUM IS PRESENT, PROVIDED NOTICE OF THE PROPOSED AMENDMENT, ALTERATION OF REPEAL HAD BEEN GIVEN OF SUCH MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>COPIES OF THE 990 AND FINANCIAL STATMENTS ARE DISTRIBUTED TO THE BOARD FOR APPROVAL PRIOR TO FILING OF THE FORM 990 AND RELATED SCHEDULES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL MEMBERS OF THE ORGANIZATION'S BOARD OF GOVORNERS ARE REQURED TO SIGN A CONFLICT OF INTEREST POLICY ANNUALY. NO MEMBER OF THE BOARD OR STAFF SHALL DERIVE ANY PERSONAL GAIN, DIRECTLY OR INDIRECTLY BY REASON OF PARTICIPATION WITH THE SOCIETY. THIS SHALL ALSO INCLUDE THE MEMBERS' BUSINESS OR OTHER PROFIT AFFILIATIONS, FAMILY AND OR A SIGNIFICANT OTHER, EMPLOYER, OR CLOSE ASSOCIATION WHO MAY STAND TO RECEIVE A BENEFIT OR GAIN. EACH INDIVIDUAL SHALL DISCLOSE TO THE BOARD CHAIR ANY PERSONAL INTEREST THAT HE OR SHE MAY HAVE IN ANY MATTER PENDING BEFORE THE ORGANIZATION AND SHALL REFRAIN FROM PARTICICPATION IN ANY DISCUSSION OR DECISION ON SUCH MATTERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AVAILABLE FOR PUBLIC INSPECTION AT THE SOCIETY'S ADMINISTRATIVE OFFICE</ExplanationTxt>
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</Return>