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        <FormAndLineReferenceDesc>Part III, Line 1a: If organization elected under SFAS 116 to not report are, historical treasures, o</FormAndLineReferenceDesc>
        <ExplanationTxt>The following footnote is included in the Museum's audited financial statements: "In conformity with accounting policies generally followed by art museums, the value of the Museum's collections has been excluded from the statements of financial position, and gifts of art objects are excluded from the statements of activities. Purchases of art objects by the Museum would be separately identified as decreases in net assets in the statements of activities. It is the Museum's policy to designate proceeds from the sale of art for the acquisition of art. The collections are maintained for public exhibition, education, and research in furtherance of public service, rather than for financial gain."</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part III, Line 4: Description of organization's collections and how it furthers its purpose.</FormAndLineReferenceDesc>
        <ExplanationTxt>The Museum's exempt purposes are to: (i) establish and maintain a museum and library of art, painting, and sculpture; (ii) encourage and develop the study of the fine arts and advance the general knowledge of kindred subjects; and (iii) do any and all things incidental, accessory or advantageous to the carrying out of such purposes. The Museum houses more than 12,500 works of art, including paintings, sculptures, drawings and other works on paper, photography, and other miscellaneous art objects. Approximately 1,000 works are on view in the galleries and gardens. Four temporary exhibition galleries feature rotating installations of artworks not on permanent display.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part V, Line 4: Intended uses of the endowment fund.</FormAndLineReferenceDesc>
        <ExplanationTxt>To support the general operations of the Museum.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>The following footnote is included in the Museum's audited financial statements for the tax year ending June 30, 2023: "The Museum is recognized as exempt from federal and state income taxes under Section 501(c)(3) of the Internal Revenue Code and Section 23701(d) of the California Revenue and Taxation Code. As required by the Income Tax Topic of the FASB ASC, the Museum recognizes the effect of income tax positions only if those positions are more likely than not to be sustained. The Museum believes that it has appropriate support for the tax positions taken and, as such, does not have any uncertain tax positions that result in a material impact on the Museum's financial position or changes in net assets."</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part XII, Line 2d: Other expenses and losses per audited F/S</FormAndLineReferenceDesc>
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        <PersonNm>Stephanie Villasenor</PersonNm>
        <TitleTxt>Secretary</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>170932</CompensationBasedOnRltdOrgsAmt>
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        <PersonNm>Walter W Timoshuk</PersonNm>
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        <FormAndLineReferenceDesc>Part III, Additional Information</FormAndLineReferenceDesc>
        <ExplanationTxt>Part I, Line 4b: Walter W. Timoshuk, PresidentSupplemental nonqualified retirement plan (unvested accrual) Organization: $60,000Related organization: $60,000Benefits under the plan are and remain subject to a substantial risk of forfeiture until becoming payable in the event Mr. Timoshuk is employed by the organization on a predetermined date in the future. Benefits under the plan also become payable in the event of (i) Mr. Timoshuk's death or disability, or (ii) Mr. Timoshuk's termination of employment with the organization without cause. Ronald H. Dykhuizen, Chief Financial OfficerSupplemental nonqualified retirement plan (unvested accrual) Organization: $25,550Related organization: $25,550Benefits under the plan are and remain subject to a substantial risk of forfeiture until becoming payable in the event Mr. Dykhuizen is employed by the organization on a predetermined date in the future. Benefits under the plan also become payable in the event of (i) Mr. Dykhuizen's death or disability, or (ii) Mr. Dykhuizen's termination of employment with the organization without cause.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>Two trustees, Douglas Simon and Pamela Simon Jensen, have a family relationship.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>The Museum has Members and Trustees.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>Members of the Museum elect the Trustees.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>Pursuant to the Museum's bylaws, certain decisions of the Museum's Board of Trustees, if made, would be subject to approval by the Museum's Members. Decisions subject to the affirmative vote of the Members include amendments to the Museum's bylaws, disposal of substantially all of the assets of the Museum, the merger or dissolution of the Museum, and any other decisions requiring member approval pursuant to California's Nonprofit Public Benefit Corporations Law. Each Member of the Museum is entitled to one vote on each matter submitted to a vote of the Members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Museum's Form 990 is first reviewed by the Museum's CFO and then by an outside accounting firm. The draft Form 990 is then distributed to the Museum's Audit Committee for review. The CFO, President, and a representative from the outside accounting firm meet with the Audit Committee for further review and approval. The Form 990 is then distributed to the full Board of Trustees prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Pursuant to the Museum's Conflict of Interest Policy, the Museum's trustees and officers are required to disclose any actual or possible conflicts of interest annually. It is the Museum's practice for senior management to review the disclosures and to forward them to the Chair of the Audit Committee if conflicts are disclosed. If deemed necessary by the Audit Committee Chair, potential conflicts of interest matters are presented to the board committee or the full board. Per the Policy, the board committee or the board then determines by vote if a conflict of interest exists. The person involved in the potential conflict is required to leave the board meeting or committee meeting while the issue is discussed and voted upon. All employees of the Museum are also required to annually disclose any actual or possible conflicts of interest. These disclosures are reviewed by senior management.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The process for determining the 2022 compensation of both the President and the CFO of the Museum included the following, all of which was completed during the 2022 tax year; (i) use of an independent compensation consultant to update a compensation study and review Form 990's filed by other organizations, available compensation surveys, and other relevant data; (ii) review and approval by the Compensation Committee of the board, which consists entirely of non-employee trustees; (iii) review and approval by the full board, with the employee President recusing himself from deliberations and voting; and (iv) contemporaneous substantiation of the deliberations and decisions, which are reflected in the minutes of both the Compensation Committee and the board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Museum makes its governing documents, conflict of interest policy, and financial statements available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Depreciation on capitalized donated services/facilities = -$22697</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Depreciation on capitalized donated services = -$14189</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 13:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Museum maintains a written whistleblower policy, a copy of which is provided to all Museum employees. The Museum has answered this question in the negative solely due to the fact that the Museum's written whistleblower policy was not adopted by the Museum's Board of Trustees but rather was adopted by the Museum's officers.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 14:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Museum maintains a written document retention and destruction policy, pursuant to which all document retention and destruction is actively monitored by Museum officers. The Museum has answered this question in the negative solely due to the fact that the Museum's written document retention and destruction policy was not adopted by the Museum's Board of Trustees but rather was adopted by the Museum's officers.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section A:</FormAndLineReferenceDesc>
        <ExplanationTxt>Ronald H. Dykhuizen serves as CFO, Vice President, Treasurer and Assistant Secretary.Stephanie Villasenor serves as Secretary and Vice President. Tom Brokaw serves as both Trustee and Vice Chair. Thomas L. Pfister serves as both Trustee and Chair.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section B, Line 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>Address: 15529 Arrow Hwy, Irwindale, CA 91706</ExplanationTxt>
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