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      <PaymentsToAffiliatesGrp>
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        <ManagementAndGeneralAmt>1757</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>FEES - ADP</Desc>
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      <OtherExpensesGrp>
        <Desc>OTHER EXPENSES</Desc>
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        <ManagementAndGeneralAmt>1467</ManagementAndGeneralAmt>
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      <TotalFunctionalExpensesGrp>
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        <ProgramServicesAmt>0</ProgramServicesAmt>
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        <EOYAmt>167489</EOYAmt>
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        <EOYAmt>170288</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>27608</ReconcilationRevenueExpnssAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
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        <CurrentTaxYearMinus2YearsAmt>0</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>0</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>184711</TotalAmt>
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      <TaxRevLeviedOrgnztnlBnft170Grp>
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        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>184711</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>0</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>184711</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>65537</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>41876</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>15289</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>19235</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>94399</CurrentTaxYearAmt>
        <TotalAmt>236336</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <UnrelatedBusinessNetIncm170Grp>
        <TotalAmt>0</TotalAmt>
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      <OtherIncome170Grp>
        <TotalAmt>0</TotalAmt>
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      <TotalSupportAmt>421047</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>27269</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.43869</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.66039</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleD documentId="IRS990ScheduleD">
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      <HeldWorksArtGrp />
      <CYMinus3YrEndwmtFundGrp />
      <CYMinus4YrEndwmtFundGrp />
      <LandGrp />
      <BuildingsGrp />
      <LeaseholdImprovementsGrp />
      <EquipmentGrp />
      <OtherLandBuildingsGrp />
      <FederalIncomeTaxLiabilityAmt>0</FederalIncomeTaxLiabilityAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>PAID/SICK LEAVE ACCRUAL</Desc>
        <Amt>167489</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>167489</TotalLiabilityAmt>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="IRS990ScheduleJ">
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <IndependentConsultantInd>X</IndependentConsultantInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>R David Goodman</PersonNm>
        <TitleTxt>COO/Treasurer</TitleTxt>
        <BaseCompensationFilingOrgAmt>287060</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>17765</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>48235</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>41694</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>394754</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Edward Youhana</PersonNm>
        <TitleTxt>Controller</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>3900</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
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        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Joelle Zavzavadjian</PersonNm>
        <TitleTxt>Manager of Awards and Budgets</TitleTxt>
        <BaseCompensationFilingOrgAmt>154073</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>3900</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>19470</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>14959</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>192402</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 3:</FormAndLineReferenceDesc>
        <ExplanationTxt>TMT DOES NOT HAVE A CEO OR EXECUTIVE DIRECTOR. HENRY YANG, CHAIR, JONAS ZMUIDZINAS, VICE CHAIR (UNTIL 8/2023), AND LARRY ADKISON, SECRETARY, ARE NOT COMPENSATED BY TMT. R. DAVID GOODMAN, CHIEF OPERATING OFFICER, HANDLES THE DAY-TO-DAY OPERATIONS OF THE ORGANIZATION AND IS COMPENSATED BY TMT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART II:</FormAndLineReferenceDesc>
        <ExplanationTxt>FOR THE FIVE EMPLOYEES NOTED ON PART V LINE 2A, COMPENSATION AND BENEFITS WERE PAID BY TMT. TMT INTERNATIONAL OBSERVATORY LLC, AN UNRELATED ORGANIZATION, REIMBURSES TMT FOR COMPENSATION AND BENEFITS, WHICH REPRESENT EFFORTS SPENT RELATED TO TMT INTERNATIONAL OBSERVATORY LLC.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART I, LINE 1 AND PART III, LINES 1 AND 4A:</FormAndLineReferenceDesc>
        <ExplanationTxt>ORGANIZATION'S MISSION AND PROGRAM SERVICE ACTIVITY TMT OBSERVATORY CORPORATION (TMT) IS A NONPROFIT PUBLIC BENEFIT CORPORATION FOUNDED BY THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (UC) AND CALIFORNIA INSTITUTE OF TECHNOLOGY (CALTECH), HEREINAFTER COLLECTIVELY "FOUNDING MEMBERSWAS ORIGINALLY INCORPORATED AS THE "CELT DEVELOPMENT CORPORATION" ON OCTOBER 30, 2003. THE FOUNDING MEMBERS ESTABLISHED TMT FOR THE INITIAL PURPOSE OF DEVELOPING THE DESIGN OF A GIANT SEGMENTED MIRROR TELESCOPE, THE THIRTY METER TELESCOPE, WITH THE POTENTIAL OF CONSTRUCTING, COMMISSIONING AND OPERATING AN OBSERVATORY. IN ADDITION TO THE GOALS AND MISSIONS AS DESCRIBED ABOVE, TMT WILL FOSTER SCIENTIFIC INTERACTION BETWEEN EDUCATIONAL AND RESEARCH INSTITUTIONS TO FURTHER COLLEGE AND UNIVERSITY EDUCATIONAL RESEARCH IN ASTRONOMY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOLLOWING INDIVIDUALS HAVE A BUSINESS RELATIONSHIP AS A RESULT OF THEIR RELATIONSHIPS WITH THEIR ORGANIZATIONS AND THE TMT PROJECT: UNIVERSITY OF CALIFORNIA: HENRY YANG, MICHAEL BOLTE, BRUCE MACINTOSH, AND LARRY ADKISON CALIFORNIA INSTITUTE OF TECHNOLOGY: THOMAS SOIFER, JONAS ZMUIDZINAS (UNTIL 8/2023), AND DIANA JERGOVIC</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINES 6 AND 7:</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS TMT HAS TWO MEMBERS UNIVERSITY OF CALIFORNIA (UC) AND CALIFORNIA INSTITUTE OF TECHNOLOGY (CALTECH). GOVERNANCE DECISIONS OF THE ORGANIZATION INCLUDING THE APPOINTMENT AND NUMBER OF DIRECTORS, ADMISSION OF NEW MEMBERS AND THE TERMS OF SUCH ADMISSION ARE RESERVED TO THE MEMBERS OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 8B:</FormAndLineReferenceDesc>
        <ExplanationTxt>CONTEMPORANEOUS DOCUMENTATION OF COMMITTEE MEETINGS TMT DID NOT HAVE MEETINGS OF COMMITTEES WHICH HAVE THE AUTHORITY TO ACT ON BEHALF OF THE GOVERNING BODY DURING THE YEAR ENDED SEPTEMBER 30, 2023.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 11B:</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS USED BY THE ORGANIZATION TO REVIEW FORM 990 WORKING WITH PRICEWATERHOUSECOOPERS, LLP ("PWC"), THE FORM 990 IS PREPARED. THE FORM 990 IS THEN REVIEWED BY MANAGEMENT AND THE AUDIT COMMITTEE. PRIOR TO FILING WITH THE IRS THE FINAL FORM 990 IS MADE AVAILABLE TO THE FULL BOARD. PWC SIGNS THE RETURN AS PAID PREPARER AND ELECTRONICALLY FILES THE RETURN WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 12C:</FormAndLineReferenceDesc>
        <ExplanationTxt>CONFLICT OF INTEREST POLICY ON AN ANNUAL BASIS, TMT DISTRIBUTES CONFLICT OF INTEREST LETTERS WHICH THE BOARD MEMBERS AND OFFICERS COMPLETE AND RETURN. MANAGEMENT OF TMT REVIEWS THE RETURNED FORMS FOR COMPLIANCE. IF A CONFLICT IS DISCOVERED IT IS ESCALATED TO THE APPROPRIATE PARTY WITHIN THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 15:</FormAndLineReferenceDesc>
        <ExplanationTxt>Process of determining Compensation Human Resources performs an annual review of the compensation of the organization's officers. The annual review process and any changes made to compensation is documented.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 19:</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS AND POLICIES DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE NOT OPEN TO PUBLIC INSPECTION.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>