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        <ExplanationTxt>The Organization maintains various collections which are primarily housed on the island, with some other more delicate pieces housed and displayed at the Portsmouth Athenaeum. The collection is composed of photographs, ceramics, works on paper, furniture, textiles and other local period pieces held for educational and curatorial purposes. In accordance with U.S. GAAP, these collections are not included in the consolidated statements of financial position. The Organization employs a seasonal curator to ensure its collections are protected and preserved.</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>The Organization maintains a collection of photographs, ceramics, works on paper, furniture, textiles and other local period pieces to preserve for future generations and to display to the public for educational purposes. Many of these pieces relate to the history of Star Island. Preservation and exhibition of these pieces support the exempt purpose of the Organization as described in Part III.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>The intended use for the Corporation's endowment funds is to support the Corporation's primary tax exempt purpose including, but not limited to: maintaining the property and buildings thereon and safeguarding the financial viability of the Corporation for the future.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Corporation and the Permanent Trust are exempt from taxes under Internal Revenue Code Section 501(c)(3) to operate as not-for-profits. The Corporation has also been classified as an entity that is not a private foundation within the meaning of Section 509(a), and contributions to the Corporation are deductible by the donors as provided in Section 170(b)(1)(A)(viii). FASB Accounting Standards Codification (ASC) Topic 740, Income Taxes, establishes financial accounting and disclosure requirements for recognition and measurement of tax positions taken or expected to be taken. Management has reviewed the tax provisions for the Organization under FASB ASC Topic 740 and determined it did not have a material impact on the Organization's consolidated financial statements.</ExplanationTxt>
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        <FoodAndBeverageTotalEventsAmt>1257</FoodAndBeverageTotalEventsAmt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>During 2025, the Organization delegated its human resource (Jan-Dec) function to Insource Services, an unrelated organization.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The Corporation's by-laws permit a membership of up to 500 persons. Members collectively agree to be responsible for the ongoing well-being of Star Island Corporation.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>The Corporation's members are responsible for electing members of the Governing Board. Further information regarding membership in The Star Island Corp can be found at www.starisland.org.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Prior to filing, the 990 is reviewed in detail by the CEO and Finance Team. The 990 is then provided to the Board Treasurer, the Audit Subcommittee, and the Finance Committee for their review and approval. Once these individuals and committees have reviewed and approved the Form 990, the Form is distributed to the entire Board for review and adoption.</ExplanationTxt>
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        <ExplanationTxt>The Organization requires all officers and directors to annually disclose any potential conflicts of interest to determine if any further action is considered necessary.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization utilizes outside consultants in determining reasonable compensation for their CEO, and other top management officials. The Organization's directors are entirely volunteer and none receive any compensation for their services.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization makes its Governing Documents, Conflict of Interest Policy, and Financial Statements available to the public upon request. The Organization also offers some of this information through its website.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part X, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The Star Island Permanent Trust is a separate trust that was established by Star Island Corporation to manage and oversee investments that were originally held and managed by Star Island Corporation. The Trust is governed by a board of trustees that is separate from the governing board of Star Island Corporation, and it files its own separate Form 990. Because Star Island Corporation is the sole beneficiary of the Trust and established the Trust, accounting standards require that the Trust be included on the financial statements of the Star Island Corporation. Therefore, Line 15 of the balance sheet includes the beneficial interest in Star Island Permanent Trust. Additional information regarding the Star Island Permanent Trust is included on Schedule R.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part X, Line 10: Land, Buildings, and Equipment</FormAndLineReferenceDesc>
        <ExplanationTxt>Section 1.263(a)-3(n) Election: The Star Island Corporation 30 Middle Street Portsmouth, NH 03801 EIN: 04-6000828 Section 1.263(a)-3(n) Election: The Star Island Corporation is electing to capitalize repair and maintenance costs under Regulation Section 1.263(a)-3(n).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, line 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>Change in Beneficial Interest in Star Island Permanent Trust 201,420.</ExplanationTxt>
      </SupplementalInformationDetail>
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          <CityNm>Portsmouth</CityNm>
          <StateAbbreviationCd>NH</StateAbbreviationCd>
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        <PrimaryActivitiesTxt>Management of Investments for The Star Island Corporation</PrimaryActivitiesTxt>
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