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      <FeesForServicesProfFundraising>
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        <ProgramServices>149944</ProgramServices>
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      <Occupancy>
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        <ProgramServices>876555</ProgramServices>
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      <TravelEntrtnmntPublicOfficials>
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      <PaymentsToAffiliates>
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      <OtherExpenses>
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      <OtherExpenses>
        <Description>CALTECH SEVICES</Description>
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        <ManagementAndGeneral>50975</ManagementAndGeneral>
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      <OtherExpenses>
        <Description>FEES</Description>
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      <Form990ScheduleJPartIII>
        <Identifier>SCHEDULE J, PART I, LINE 1A:</Identifier>
        <Explanation>TMT PAID FOR AN UPGRADE TO FIRST CLASS TRAVEL FOR ONE OF ITS BOARD MEMBERS. THIS UPGRADE PURCHASE WAS DONE IN ACCORDANCE WITH THE TMT TRAVEL POLICY. SCHEDULE J, PART I, LINE 3: Henry Yang, the CEO, is not compensated by TMT. While TMT does not have an Executive Director, Gary Sanders, the Project Manager, is in control of the day-to-day operations of the organization. SCHEDULE J, PART II: GARY SANDERS RECEIVED A FORM W-2 FROM THE CALIFORNIA INSTITUTE OF TECHNOLOGY DURING CALENDAR YEAR 2012. TMT OBSERVATORY CORPORATION REIMBURSES CALTECH FOR HIS COMPENSATION AND BENEFITS.</Explanation>
      </Form990ScheduleJPartIII>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <GeneralExplanation>
        <Identifier>PART I, LINE 1 AND PART III, LINES 1 AND 4A</Identifier>
        <ReturnReference>ORGANIZATION'S MISSION AND PROGRAM SERVICE ACTIVITY</ReturnReference>
        <Explanation>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 MEMBERS" AND WAS 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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, LINE 2:</Identifier>
        <ReturnReference>BUSINESS RELATIONSHIPS</ReturnReference>
        <Explanation>DIRECTOR, DR. HENRY YANG, IS CHANCELLOR AT THE UNIVERSITY OF CALIFORNIA, SANTA BARBARA. DIRECTOR, DR. MICHAEL BOLTE, AND TREASURER, NATHAN BROSTROM, ARE EMPLOYED BY THE UNIVERSITY OF CALIFORNIA.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, LINES 6 AND 7:</Identifier>
        <ReturnReference>MEMBERS</ReturnReference>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, LINE 11B:</Identifier>
        <ReturnReference>PROCESS USED BY THE ORGANIZATION TO REVIEW FORM 990</ReturnReference>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, LINE 12C:</Identifier>
        <ReturnReference>CONFLICT OF INTEREST POLICY</ReturnReference>
        <Explanation>ON AN ANNUAL BASIS, TMT OBSERVATORY CORPORATION ("TMT") DISTRIBUTES CONFLICT OF INTEREST LETTERS WHICH THE BOARD MEMBERS AND KEY 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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, LINE 15:</Identifier>
        <ReturnReference>PROCESS OF DETERMINING COMPENSATION</ReturnReference>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, LINE 18:</Identifier>
        <ReturnReference>AVAILABILITY OF FORM 990 FOR PUBIC INSPECTION</ReturnReference>
        <Explanation>FORM 990 WILL ALSO BE MADE AVAILABLE THROUGH GUIDESTAR.ORG. FORM 990, PART VI, LINE 19: AVAILABILITY OF GOVERNING DOCUMENTS AND POLICIES DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST. FORM 990, PART VII: GARY SANDERS RECEIVED A FORM W-2 FROM THE CALIFORNIA INSTITUTE OF TECHNOLOGY DURING CALENDAR YEAR 2012. TMT OBSERVATORY CORPORATION REIMBURSES CALTECH FOR HIS COMPENSATION AND BENEFITS.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>