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        <CurrentYearMinus2Amt>107264</CurrentYearMinus2Amt>
        <CurrentYearMinus1Amt>141732</CurrentYearMinus1Amt>
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      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>false</RelatedOrgListSchRInd>
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        <FormAndLineReferenceDesc>Part III, Line 4: Description of organization's collections and how it furthers its purpose.</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S COLLECTIONS OF ART, HISTORICAL TREASURES AND ANTIQUES BELONGED TO THE TWO FAMILIES THAT LIVED IN THE STIMSON-GREEN MANSION AND WERE DONATED TO THE ORGANIZATION ALONG WITH THE MANSION. THE ORGANIZATION USES THE COLLECTIONS TO INTERPRET THE HISTORY AND ARCHITECTURE OF THE MANSION AND THE LIVES OF THE FAMILIES AND INDIVIDUALS WHO LIVED AND WORKED HERE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4: Intended uses of the endowment fund.</FormAndLineReferenceDesc>
        <ExplanationTxt>TERM ENDOWMENTS ARE INTENDED TO BE USED FOR THE DEVELOPMENT AND ENHANCEMENT OF VARIOUS PROGRAMS AND FACILITIES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>AN ELECTRONIC VERSION OF THE 990 IS SENT TO THE EXECUTIVE COMMITTEE FOR THEIR REVIEW AND APPROVAL.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CONFLICT OF INTEREST POLICY IS SENT TO EVERY MEMBER OF THE BOARD OF DIRECTORS AND STAFF ANNUALLY. EACH BOARD AND STAFF MEMBER SIGNS THE POLICY AND RETURNS IT TO THE WASHINGTON TRUST OFFICE, WHERE THE POLICIES ARE KEPT ON FILE. IF A BOARD OR STAFF MEMBER DISCLOSES A CONFLICT OF INTEREST, THE ORGANIZATION MONITORS THE CONFLICT BY ENSURING THAT THE BOARD OR STAFF MEMBER RECUSES HIMSELF OR HERSELF FROM ANY DISCUSSIONS OR ACTIONS RELATED TO THE CONFLICT.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a: Compensation Review &amp; Approval Process - CEO, Top Management</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION FOR THE ORGANIZATION'S EXECUTIVE DIRECTOR IS DETERMINED BY THE EXECUTIVE COMMITTEE. THE EXECUTIVE COMMITTEE CONDUCTS AN ANNUAL REVIEW OF THE EXECUTIVE DIRECTOR AND COLLECTS COMPARABILITY DATA FROM OTHER NON-PROFIT HISTORIC PRESERVATION ADVOCACY ORGANIZATIONS TO SUBSTANTIATE THE EXECUTIVE DIRECTOR'S LEVEL OF COMPENSATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b: Compensation Review and Approval Process for Officers and Key Employees</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPENSATION FOR THE ORGANIZATION'S KEY EMPLOYEES IS DETERMINED BY THE EXECUTIVE DIRECTOR IN CONSULTATION WITH THE EXECUTIVE COMMITTEE. THE EXECUTIVE DIRECTOR CONDUCTS AN ANNUAL REVIEW OF KEY EMPLOYEES AND COLLECTS COMPARABILITY DATA FROM OTHER NON-PROFIT HISTORIC PRESERVATION ADVOCACY ORGANIZATIONS TO SUBSTANTIATE THE LEVEL OF COMPENSATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
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</Return>