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        <Desc>DEFERRED REVENUE</Desc>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <NetUnrealizedGainsInvstAmt>-1573307</NetUnrealizedGainsInvstAmt>
      <OtherRevenueAmt>117418</OtherRevenueAmt>
      <RevenueNotReportedAmt>-1455889</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>3133870</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>3133870</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>2161523</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>117418</OtherExpensesIncludedAmt>
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        <FormAndLineReferenceDesc>Part III, Line 1a: If organization elected under SFAS 116 to not report are, historical treasures, o</FormAndLineReferenceDesc>
        <ExplanationTxt>NOTE 5 OF FINANCIAL STATEMENTS- COLLECTIONS: "COLLECTIONS CONSIST OF WORKS OF ART, OBJECTS, ARTIFACTS, AND RECORDS REFLECTIVE OF CAPE ANN AND ITS HERITAGE. COLLECTION ITEMS, WEATHER PURCHASED OF DONATED, ARE NOT CAPITALIZED BECAUSE THEIR INTRINSIC VALUE IS NOT SUSCEPTIBLE TO REASONABLE ESTIMATION. THE COLLECTION IS CARRIED AT $1.00. IT IS THE POLICY OF THE MUSEUM THAT PROCEEDS FROM THE SALE OF COLLECTION ITEMS WILL BE USED TO PURCHASE ADDITIONAL COLLECTION ITEMS OR TO MAINTAIN OR PRESERVE THE COLLECTION. NEW ACQUISITIONS ARE THEN CHARGED AS COLLECTION ACQUISITONS. THE COLLECTIONS OF THE MUSEUM ARE ITS PRIMARY ASSET AND THEIR DISPLAY AND ACCESSIBILITY TO THE PUBLIC ARE TWO OF ITS PRIMARY OBJECTIVES. A COLLECTIONS COMMITTEE MONITORS THE ACQUISITION AND DISPOSITION OF COLLECTION ITEMS. THE COMMITTEE AND MANAGEMENT ARE RESPONSIBLE FOR RECOMMENDING AND IMPLEMENTING MEASURES TO ENHANCE THE CONSERVATION, MAINTENANCE AND SECURITY OF THE COLLECTION."</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part III, Line 4: Description of organization's collections and how it furthers its purpose.</FormAndLineReferenceDesc>
        <ExplanationTxt>SEE DESCRIPTION FOR PART III, LINE 1A, REGARDING THE DESCRIPTION OF THE ORGANIZATION'S COLLECTIONS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4: Intended uses of the endowment fund.</FormAndLineReferenceDesc>
        <ExplanationTxt>PERMANENTLY RESTRICTED ENDOWMENTS PROVIDE INCOME TO SUPPORT CURRENT OPERATIONS. THE BOARD RESTRICTED ERNDOWMENTS ARE HELD TO PROVIDE FINANCIAL SECURITY IN THE FUTURE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MUSEUM HAS BEEN GRANTED TAX-EXEMPT STATUS INDER THE INTERNAL REVENUE CODE SECTION 501(C) (3) AND IS THEREFORE GENERALLY EXEMPT FROM FEDERAL AND STATE INCOME TAXES. ACCORDINGLY, NO PROVISION FOR INCOME TAXES HAS BEEN PROVIDED IN THE ACCOMPANYING FINANCIAL STATEMENTS. THE MUSEUM IS NOT A PRIVATE FOUNDATION.THE MUSEUM IS REQUIRED TO EVALUATE OR DISCLOSE TAX POSITIONS THAT COULD HAVE AN EFFECT ON THE MUSEUM'S FINANCIAL STATEMENTS. THE MUSEUM REPORTS ITS ACTIVITIES TO THE INTERNAL REVENUE SERVICE AND TO THE COMMONWEALTH OF MASSACHUSETTS ON AN ANNUAL BASIS. THESE INFORMATIONAL RETURNS ARE GENERALLY SUBJECT TO AUDIT AND REVIEW BY THE GOVERNMENT AGENCIES FOR A PERIOD OF THREE YEARS AFTER FILING. SUBSTANTIALLY ALL OF THE MUSEUM'S INCOME, EXPENDITURES AND ACTIVITIES RELATE TO ITS EXEMPT PURPOSE, THEREFORE, MANAGEMENT HAS DETERMINED THAT THE MUSEUM IS NOT SUBJECT TO UNRELATED BUSINESS INCOME TAXES AND WILL CONTINUE TO QUALIFIY AS A TAX-EXEMPT NOT-FOR-PROFIT ENTITY.THE MUSEUM HAS FILED ALL OF ITS KNOWN REQUIRED RETURNS IN A TIMELY MANNER INCLUDING, AS PERMITTED, ALLOWED EXTENSIONS. AS OF DECEMBER 31, 2018, THE RETURN OF ORGANIZATION EXEMPT FROM INCOME TAX ON FORM 990 FOR THE YEARS AFTER 2014 REMAIN OPEN TO EXAMINATION BY THE INTERNAL REVENUE SERVICE AND THE MASSACHUSETTS ATTORNEY GENERAL'S OFFICE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 2d: Other revenue amounts included in F/S but not included on form 990</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF GOODS SOLD-NETTED WITH INCOME $71320 FUNDRAISING EXPENSES-NETTED WITH INCOME $46098</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d: Other expenses and losses per audited F/S</FormAndLineReferenceDesc>
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      <InPersonSolicitationsInd>X</InPersonSolicitationsInd>
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          <BusinessNameLine1Txt>DEVELOPMENT GUILD INC</BusinessNameLine1Txt>
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          <AddressLine1Txt>233 HARVARD ST SUITE 107</AddressLine1Txt>
          <CityNm>BROOKLINE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02446</ZIPCd>
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        <ActivityTxt>CAMPAIGN PLANNING</ActivityTxt>
        <FundraiserControlOfFundsInd>false</FundraiserControlOfFundsInd>
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        <Event2Nm>WOMEN'S LUNCHEON</Event2Nm>
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        <TransactionDesc>GALLERY RENO/REPAIRS</TransactionDesc>
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        <FormAndLineReferenceDesc>Part I, Line 33, Revenues Not Reported</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MUSEUM HAS ADOPTED ACCOUNTING PRINCIPLES WHEREIN IT DOES NOT CAPITALIZE DONATIONS OF ARTWORK AND HISTORICAL ARTIFACTS TO ITS COLLECTIONS AND THEREFORE THE RELATED REVENUE IS ALSO NOT RECOGNIZED.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6: Explanation of Classes of Members or Shareholder</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS MEMBERS. MEMBERS ARE REQUIRED TO PAY AN ANNUAL MEMBERSHIP FEE. THERE IS ONLY ONE CLASS OF MEMBERS AND ALL MEMBERS HAVE THE SAME RIGHTS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE FINANCE COMMITTEE AND A COMPLETE COPY OF THE FORM 990 IS PROVIDED TO ALL BOARD MEMBERS PRIOR TO FILING.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL CURRENT AND FUTURE BOARD MEMBERS ARE GIVEN A COPY OF THE CONFLICT OF INTEREST POLICY AND THEY ARE REQUIRED TO SIGN A REGISTRY INDICATING THEY HAVE REVIEWED AND READ THE POLICY. THE REGISTRY IS MAINTAINED BY THE DIRECTOR.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a: Compensation Review &amp; Approval Process - CEO, Top Management</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF GOVERNORS AND THE EXECUTIVE COMMITTEE REVIEW COMPARABILITY DATA FROM THE NEW ENGLAND MUSEUM ASSOCIATION COMPENSATION SURVEY AND SUBSEQUENTLY APPROVE ANNUAL COMPENSATION OF THE EXECUTIVE DIRECTORS AND OTHER KEY EMPLOYEES. OFFICERS AND DIRECTORS OF THE BOARD ARE NOT COMPENSATED.</ExplanationTxt>
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        <ExplanationTxt>THE MUSEUM'S CONFLICT OF INTEREST, DOCUMENT RETENTION, AND WHISTLEBLOWER POLICIES, AS WELL AS ITS GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
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        <ExplanationTxt>THERE IS NO CHANGE IN THE PROCESS, THE ORGANIZATION HAS A FINANCE COMMITTEE AND AN AUDIT COMMITTEE THAT OVERSEES THE AUDIT ANNUALLY.</ExplanationTxt>
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