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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MASON CONTRACTORS ASSOCIATION OF ST. LOUIS (MEMBER) APPOINTS THE BOARD OF TRUSTEES (GOVERNING BODY) TO ADMINISTER THE TRUST IN ACCORDANCE TO ITS TERMS</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MASON CONTRACTORS ASSOCATION OF ST. LOUIS APPOINTS TRUSTEES OF THE MASONRY INSTITUTE OF ST. LOUIS, INC. GOVERNING BODY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>CHAIRMAN OF THE BOARD OF DIRECTORS REVIEWS RETURN</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>PAY RAISES AND BONUSES ARE DETERMINED DURING THE BUDGETING PROCESS AND THE BOARD OF TRUSTEES DETERMINES THE RAISE AND BONUS AMOUNT FOR THE TECHNICAL DIRECTOR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>NO DOCUMENTS ARE AVAILABLE TO THE PUBLIC.</ExplanationTxt>
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    </IRS990ScheduleO>
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          <AddressLine1Txt>1429 SOUTH BIG BEND BLVD</AddressLine1Txt>
          <CityNm>SAINT LOUIS</CityNm>
          <StateAbbreviationCd>MO</StateAbbreviationCd>
          <ZIPCd>63117</ZIPCd>
        </USAddress>
        <EIN>430396230</EIN>
        <PrimaryActivitiesTxt>COLLECT AND DISTRIBUTE INFORMATION; ADVANCE MASONRY INDUSTRY</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MO</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(6)</ExemptCodeSectionTxt>
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      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
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</Return>