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      <OtherLandBuildings>
        <InvestmentCostOrOtherBasis>0</InvestmentCostOrOtherBasis>
        <OtherCostOrOtherBasis>7131660</OtherCostOrOtherBasis>
        <Depreciation>4180363</Depreciation>
        <BookValue>2951297</BookValue>
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      <TotalOfBookValueLandBuildings>97006186</TotalOfBookValueLandBuildings>
      <CloselyHeldEquityInterests>
        <BookValue>0</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
      </CloselyHeldEquityInterests>
      <OtherSecurities>
        <Description>Hedge Funds</Description>
        <BookValue>77732898</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
      </OtherSecurities>
      <OtherSecurities>
        <Description>US Bond Funds</Description>
        <BookValue>12803060</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
      </OtherSecurities>
      <OtherSecurities>
        <Description>Real Asset Funds</Description>
        <BookValue>12486806</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
      </OtherSecurities>
      <OtherSecurities>
        <Description>Private Equity Funds</Description>
        <BookValue>6701964</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
      </OtherSecurities>
      <OtherSecurities>
        <Description>Venture Capital Funds</Description>
        <BookValue>7092760</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
      </OtherSecurities>
      <TotalOfBookValueSecurities>116817488</TotalOfBookValueSecurities>
      <OtherAssets>
        <Description>Bond Proceeds Held by Trustee</Description>
        <BookValue>179</BookValue>
      </OtherAssets>
      <TotalBookValueOtherAssets>179</TotalBookValueOtherAssets>
      <FederalIncomeTaxLiability>0</FederalIncomeTaxLiability>
      <OtherLiabilities>
        <Description>Interest Rate Swap Agreements</Description>
        <Amount>8435086</Amount>
      </OtherLiabilities>
      <TotalOfAmounts>8435086</TotalOfAmounts>
      <TotalRevenue>33851932</TotalRevenue>
      <TotalExpenses>35661362</TotalExpenses>
      <ExcessOrDeficitForYear>-1809430</ExcessOrDeficitForYear>
      <NetUnrealizedGLOnInvestments>20909442</NetUnrealizedGLOnInvestments>
      <DonatedServicesAndFacilities>0</DonatedServicesAndFacilities>
      <InvestmentExpenses>0</InvestmentExpenses>
      <PriorPeriodAdjustments>0</PriorPeriodAdjustments>
      <OtherAmount>-2417472</OtherAmount>
      <TotalAdjustments>18491970</TotalAdjustments>
      <ExcessOrDeficitPerFS>16682540</ExcessOrDeficitPerFS>
      <TotRevenueEtcAuditedFinclStmt>48638703</TotRevenueEtcAuditedFinclStmt>
      <NetUnrealizedGainsInvestments>20909442</NetUnrealizedGainsInvestments>
      <DonatedSrvcAndUseOfFacilities>0</DonatedSrvcAndUseOfFacilities>
      <RecoveriesOfPriorYearGrants>0</RecoveriesOfPriorYearGrants>
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      <OtherExpensesNotIncluded>4624475</OtherExpensesNotIncluded>
      <ExpensesNotRptdOnFinStmt>6150372</ExpensesNotRptdOnFinStmt>
      <TotalExpensesPerForm990>35661362</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P05_S00_L04</Identifier>
        <ReturnReference>Schedule D, Part V, Line 4</ReturnReference>
        <Explanation>To support the educational mission of the school.</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P10_S00_L00</Identifier>
        <ReturnReference>Schedule D, Part X</ReturnReference>
        <Explanation>The School follows FASB ASC 740, Income Taxes, which clarifies the accounting for uncertainty in income taxes by prescribing the recognition threshold a tax position is required to meet before being recognized in the financial statements. It also provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. Management believes that the School has no material uncertain tax positions.</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P11_S00_L08</Identifier>
        <ReturnReference>Schedule D, Part XI, Line 8</ReturnReference>
        <Explanation>Change in accrued pension liability $(152,414), unrealized gain (loss) swaps $(2,518,724), change in value-split interest $253,666.</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P12_S00_L02d</Identifier>
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        <Explanation>Investment management fees ($1,253,035), other professional services ($179,843), bank charges ($59,482), annuity payments ($11,492), federal tax payments on investments ($20,696), state tax payments on investments ($1,349), financial aid ($4,624,475).</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P12_S00_L04b</Identifier>
        <ReturnReference>Schedule D, Part XII, Line 4b</ReturnReference>
        <Explanation>Rental expenses of ($27,701) are associated with unrelated business income.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P13_S00_L02d</Identifier>
        <ReturnReference>Schedule D, Part XIII, Line 2d</ReturnReference>
        <Explanation>Change in accrued pension liability $152,414, rental expenses associated with unrelated business income $27,701, interest rate swap agreements $2,518,724, change in value split interest agreements ($253,666).</Explanation>
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      <Form990ScheduleDPartXIV>
        <Identifier>SchD_P13_S00_L04b</Identifier>
        <ReturnReference>Schedule D, Part XIII, Line 4b</ReturnReference>
        <Explanation>Financial aid of 4,624,475 is reflected as a net to tuition.</Explanation>
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      <PolicyStatementInBrochuresEtc>1</PolicyStatementInBrochuresEtc>
      <PolicyPublViaBroadcastMedia>1</PolicyPublViaBroadcastMedia>
      <PubViaBroadcastMediaExpln>The school's application, which can be mailed upon request or accessed through the school's website at www.groton.org, clearly stipulates that Groton does not discriminate on the basis of gender, race, color, disability, religion, sexual orientation, or national origin in the administration of the school's admission policies and financial aid programs.</PubViaBroadcastMediaExpln>
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          <State>MA</State>
          <ZIPCode>01450</ZIPCode>
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      <Form990ScheduleIPartIII>
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      <Form990ScheduleIPartIII>
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      <Form990ScheduleIPartIV>
        <Identifier>SchI_P01_S00_L02</Identifier>
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        <Explanation>The school works directly with town officials and local charitable organizations to assess future needs and the use of current and past monetary grants. The school also makes several other small donations throughout the year based on charitable purpose, historical relationship, and current needs. These one time contributions are not typically monitored by the CFO and the Headmaster. Financial aid grants are awarded annually to qualified students and are applied as credits to the tuition bill up to the amount of the grant for the current academic year.</Explanation>
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        <NamePerson>Richard B Commons</NamePerson>
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        <NamePerson>John Niles</NamePerson>
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      <Form990ScheduleJPartII>
        <NamePerson>Ian M Gracey</NamePerson>
        <BaseCompensationFilingOrg>100725</BaseCompensationFilingOrg>
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      <Form990ScheduleJPartIII>
        <Identifier>SchJ_P01_S00_L01a</Identifier>
        <ReturnReference>Schedule J, Part I, Line 1a</ReturnReference>
        <Explanation>Faculty are required to live in on-campus housing as a condition of employment. The Headmaster's home includes some space that is reserved for school related meetings and student activities. The cost of maintaining this allotted space is paid by the school and recorded as an operating expense. The Headmaster's contract, which is approved by the President and the Compensation Committee, includes the cost of a social club and residential house cleaning. These costs are recorded by the school as taxable benefits and reported on the W-2. The school will only pay for the cost of a traveling spouse when they are also participating in school related fundraising events.</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>SchJ_P01_S00_L04</Identifier>
        <ReturnReference>Schedule J, Part I, Line 4</ReturnReference>
        <Explanation>The Headmaster's contracts, which is approved by the President and the Compensation Committee, included an annual $35,000 deferred compensation contribution. The school deposited the initial payment to a qualified 457(b) plan up to the annual IRS limit of $16,500. The remaining balance of $18,500 was deposited to a non-qualified 457(f) plan.</Explanation>
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      <Form990ScheduleKPartI>
        <IssuerName>
          <BusinessNameLine1>Massachusetts Development Finance Agency</BusinessNameLine1>
        </IssuerName>
        <IssuerEIN>043431814</IssuerEIN>
        <CUSIPNumber>57583RMR3</CUSIPNumber>
        <DateIssued>2007-05-24</DateIssued>
        <IssuePrice>10000000</IssuePrice>
        <DescriptionOfPurpose>Building and Structure Renovations</DescriptionOfPurpose>
        <Defeased>0</Defeased>
        <OnBehalfOfIssuer>0</OnBehalfOfIssuer>
      </Form990ScheduleKPartI>
      <Form990ScheduleKPartII>
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        <CapitalExpenditures>9800000</CapitalExpenditures>
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        <AdvanceRefunding>0</AdvanceRefunding>
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        <NameOfHedgeProvider>
          <BusinessNameLine1>The Bank of New York</BusinessNameLine1>
          <BusinessNameLine2>40 Year Swap</BusinessNameLine2>
        </NameOfHedgeProvider>
        <TermOfHedge>3.59</TermOfHedge>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>Lindsay Commons</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Headmaster's Wife</Relationship>
        <AmountOfTransaction>30930</AmountOfTransaction>
        <DescriptionOfTransaction>Salary for co-hosting events</DescriptionOfTransaction>
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      </Form990ScheduleLPartIV>
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        <NumberOfContributions>104</NumberOfContributions>
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        <MethodOfDeterminingRevenues>FMV</MethodOfDeterminingRevenues>
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      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L11</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 11</ReturnReference>
        <Explanation>A draft of the public disclosure version of the form 990 was distributed electronically as a PDF transmission to each member of the Audit Committee prior to the January 2011 board meeting. The Committee performed a thorough review of the draft prior to presenting it to the full board. Each trustee was given the opportunity to ask questions and suggest possible revisions. Upon completion of the review, the board voted to accept the draft Form 990 including requested revisions.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L12c</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 12c</ReturnReference>
        <Explanation>All school officers, Key Employees, and members of the Board of Trustees are required annually to read the conflict of interest policy and sign the document. This signature indicates an understanding of the guidelines and an assurance to the Board that they are in compliance with the policy. Any potential conflict must be disclosed and reviewed by the President of the Board to determine if further action is required.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0B_L15</Identifier>
        <ReturnReference>Form 990, Part VI, Section B, Line 15</ReturnReference>
        <Explanation>An employment contract between the Headmaster and the school is updated periodically and renewed annually. Each year, the President and Compensation Committee review the Headmaster's and other senior administrator's salaries and benefits. Annual salary and benefit offerings are discussed with the Headmaster and reported to the full Board. The annual salary and benefit offerings for the Chief Financial Officer are made by the Headmaster. All salaries and benefit offerings for the remaining school employees are updated annually and approved by the Chief Financial Officer of the Headmaster up to the budget limits set by the Board of Trustees.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>F990_P06_S0C_L19</Identifier>
        <ReturnReference>Form 990, Part VI, Section C, Line 19</ReturnReference>
        <Explanation>The financial statements can be viewed on-line by going to www.DisclosureUSA.org, an independently operated website. The Conflict of Interest Policy and the Governing Documents may be viewed any time upon request.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
    <ReasonableCauseExplanation documentId="R000012" softwareId="09000073" softwareVersion="v1.00">
      <Explanation>The form 8868, an Application for Extension of Time to File an Exempt Organization Return, was filed on November 10, 2010. This extension provides the School's Board of Directors the time necessary to complete a thorough review of the return.</Explanation>
    </ReasonableCauseExplanation>
  </ReturnData>
</Return>