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        <NontaxableBenefitsFilingOrgAmt>9822</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>325410</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>TMT PAID A HOUSING ALLOWANCE, GROSS UP PAYMENTS AND TRAVEL FOR COMPANIONS FOR ONE OF ITS HIGHEST COMPENSATED EMPLOYEES. THESE PAYMENTS WERE TREATED AS TAXABLE COMPENSATION. SCHEDULE J, PART I, LINE 3: Henry Yang, CHAIR, AND FIONA HARRISON, VICE CHAIR, ARE not compensated by TMT. R. David Goodman, CHIEF OPERATING OFFICER, handleS the day-to-day operations of the organization. SCHEDULE J, PART II THE AMOUNTS INCLUDED ON PART VII AND SCHEDULE J, PART II REFLECT W-2 COMPENSATION AMOUNTS PAID BY TMT TO THE LISTED INDIVIDUALS. CERTAIN LISTED INDIVIDUALS RENDER SERVICE TO TMT INTERNATIONAL OBSERVATORY (TIO), AN UNRELATED ORGANIZATION, PURSUANT TO A PERSONNEL ADMINISTRATIVE AGREEMENT. TMT IS REIMBURSED BY TIO FOR ANY SUCH SERVICES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>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. PART III, LINE 3: TMT'S ACTIVTIIES WHICH LARGELY INVOLVED THE INITIATION OF THE DESIGN, DEVELOPMENT, CONSTRUCTION AND OPERATION OF THE THIRTY METER TELESCOPE (TMT PROJECT) IS NOW SUCCEEDED BY TMT INTERNATIONAL OBSERVATORY, LLC (TIO) WHICH IS ALSO A NONPROFIT PUBLIC BENEFIT CORPORATION. WHILE TMTS ACTIVITIES HAVE LARGELY INVOLVED INITIATION OF THE TMT PROJECT AND CARRYING OUT VARIOUS PRE-CONSTRUCTION PHASE STEPS TOWARD ADVANCEMENT OF THE TMT PROJECT, IT IS EXPECTED THAT TIO WILL CARRY OUT THE REMAINING PHASES OF THE TMT PROJECT AND SHARE PERSONNEL WITH TMT PURSUANT TO A PERSONNEL &amp; ADMINISTRATIVE SERVICES AGREEMENT (PAA) INTENDED TO FACILITATE SHARING OF CERTAIN EMPLOYEES AND RESOURCES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>BUSINESS RELATIONSHIPS CHAIR, DR. HENRY YANG, IS CHANCELLOR AT THE UNIVERSITY OF CALIFORNIA, SANTA BARBARA. DIRECTOR, DR. MICHAEL BOLTE, DIRECTOR, NATHAN BROSTROM, AND SECRETARY, LARRY ADKISON ARE EMPLOYED BY THE UNIVERSITY OF CALIFORNIA. TREASURER DEAN CURRIE, IS VP FOR BUSINESS AND FINANCE AT CALIFORNIA INSTITUTE OF TECHNOLOGY. DIRECTOR SHRINIVAS KULKARNI, IS PROFESSOR OF ASTRONOMY AND PLANETARY SCIENCE AND DIRECTOR OF OPTICAL OBSERVATORIES AT CALIFORNIA INSTITUTE OF TECHNOLOGY. DIRECTOR DIANA JERGOVIC, IS VP FOR STRATEGY IMPLEMENTATION AT CALIFORNIA INSTITUTE OF TECHNOLOGY. DIRECTORS B. THOMAS SOIFER AND FIONA HARRISON ARE PROFESSORS AT CALIFORNIA INSTITUTE OF TECHNOLOGY.</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 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 OBSERVATORY CORPORATION ("TMT") DISTRIBUTES CONFLICT OF INTEREST LETTERS WHICH THE BOARD MEMBERS, KEY EMPLOYEES AND HIGHEST COMPENSATED EMPLOYEES 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 TMT has an executive compensation committee that annually reviews the compensation of the organizations key employees and highest compensated employees. The committees deliberations are documented. The committee does not review ALL employees' compensation, only key employees and highest compensated employees.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 18:</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 WILL ALSO BE MADE AVAILABLE THROUGH GUIDESTAR.ORG. FORM 990, PART VI, LINE 19: GOVERNING DOCUMENTS AND POLICIES DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST. FORM 990, PART IX, LINE 24C: IN 2014, TMT ENTERED INTO AN AGREEMENT WITH TIO FOR THE PROVISION OF ADMINISTRATIVE AND LABOR SERVICES. THE PAYMENT FOR THESE SERVICES IS REFLECTED ON THIS LINE. FORM 990, PART XI, LINE 10: UPON REVIEW OF ITS BOOKS AND RECORDS, TMT NOTED FOR FY15 ITS BALANCE SHEET DID NOT INCLUDE CERTAIN ACCRUALS THAT SHOULD HAVE BEEN INCLUDED. AFTER REVIEW OF THE ADJUSTMENT FOR THESE ACCRUALS, TMT DETERMINED AN ADJUSTMENT TO PRIOR YEAR'S BOOKS AND RECORDS WAS NOT REQUIRED. THE FINANCIAL INFORMATION INCLUDED ON THE CURRENT YEAR FORM 990 ACCURATELY REFLECTS FINANCIAL INFORMATION PER TMT'S BOOKS AND RECORDS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART IX LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION:OTHER TOTAL FEES:78992</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>