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        <MethodOfValuation>F</MethodOfValuation>
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        <ReturnReference>PART III, LINE 4:</ReturnReference>
        <Explanation>THE FOUNDATIONS COLLECTIONS CONSIST OF ARTIFACTS OF HISTORICAL SIGNIFICANCE, INCLUDING ORIGINAL DOCUMENTS, PHOTOGRAPHS, BOOKS, OBJECTS AND PAINTINGS. EACH ITEM IS CATALOGED FOR EDUCATION, RESEARCH, AND CULTURAL PURPOSES, AND ACTIVITIES CONCERNING CARE, APPROPRIATENESS TO LONGYEARS MISSION, VERIFICATION OF EXISTENCE AND ASSESSMENT OF CONDITION ARE PERFORMED ON AS REGULAR PROCESSES.</Explanation>
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        <Identifier>DESCRIPTION OF INTENDED USE OF ENDOWMENT FUNDS:</Identifier>
        <ReturnReference>PART V, LINE 4:</ReturnReference>
        <Explanation>THE FOUNDATIONS ENDOWMENTS CONSIST OF BOARD-DESIGNATED ENDOWMENTS AND TRUE ENDOWMENTS RESTRICTED BY DONORS AGAINST ANY EXPENDITURES OF PRINCIPAL. ANNUAL DISTRIBUTIONS ARE MADE AVAILABLE TO SUPPORT THE ANNUAL OPERATING BUDGET BASED ON THE SPENDING POLICIES OF THE RESPECTIVE ENDOWMENT AGREEMENTS.</Explanation>
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        <Identifier>DESCRIPTION OF UNCERTAIN TAX POSITIONS UNDER FIN 48:</Identifier>
        <ReturnReference>PART X:</ReturnReference>
        <Explanation>THE FOUNDATION FOLLOWS THE STANDARDS OF ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES UNDER U.S. GAAP WHICH REQUIRES THE FOUNDATION TO REPORT UNCERTAIN TAX POSITIONS, RELATED INTEREST AND PENALTIES, AND TO ADJUST ITS ASSETS AND LIABILITIES RELATED TO UNRECOGNIZED TAX BENEFITS AND ACCRUED INTEREST AND PENALTIES ACCORDINGLY. AT DECEMBER 31, 2010 THE FOUNDATION DETERMINED THAT THERE ARE NO MATERIAL UNRECOGNIZED TAX BENEFITS TO REPORT. THE FOUNDATION FILES INFORMATIONAL RETURNS IN THE UNITED STATES FEDERAL AND MASSACHUSETTS STATED JURISDICTIONS. THESE RETURNS ARE GENERALLY SUBJECT TO EXAMINATION BY TAX AUTHORITIES FOR THE LAST THREE YEARS.</Explanation>
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      <Form990ScheduleDPartXIV>
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        <Identifier>PART XIII, LINE 2D - OTHER ADJUSTMENTS:</Identifier>
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        <Explanation>A COPY OF FORM 990 WAS PROVIDED AND APPROVED BY THE FOUNDATION'S BOARD OF TRUSTEES AND AUDIT COMMITTEE PRIOR TO FINAL SUBMISSION.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>OFFICERS, TRUSTEES, AND KEY EMPLOYEES ARE REQUIRED TO DISCLOSE ANNUALLY INTERESTS THAT COULD GIVE RISE TO CONFLICTS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 15</ReturnReference>
        <Explanation>THE MUSEUM HAS ESTABLISHED A SYSTEM OF JOB CLASSIFICATIONS ACCORDING TO THE LEVEL OF EDUCATION, KNOWLEDGE, SKILL, RESPONSIBILITY, AND DECISION-MAKING. THE WAGE STRUCTURE REFLECTS THESE CLASSIFICATIONS AND IS INTENDED TO BE COMPETITIVE WITH THAT OF SIMILAR INSTITUTIONS.</Explanation>
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      <GeneralExplanation>
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        <Explanation>FILINGS ARE PUBLIC ON THIRD PARTY WEBSITES SUCH AS GUIDESTAR AND LONGYEAR WILL RESPOND TO COMPLY WITH REQUESTS IT RECEIVES DIRECTLY FOR SUCH INFORMATION.</Explanation>
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      <GeneralExplanation>
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      <GeneralExplanation>
        <Explanation>THE ORGANIZATION HAS A COMMITTEE THAT ASSUMES RESPONSIBILITY FOR THE OVERSIGHT OF THE AUDIT OF THE ANNUAL FINANCIAL STATEMENTS. NO CHANGES WERE MADE TO THIS OVERSIGHT PROCESS DURING FISCAL YEAR 2010.</Explanation>
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        <LegalDomicileState>NH</LegalDomicileState>
        <DirectControllingEntityName>
          <BusinessNameLine1>LONGYEAR FOUNDATION</BusinessNameLine1>
        </DirectControllingEntityName>
      </Form990ScheduleRPartI>
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>FOUR HUNDRED BEACON CORP</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>1125 BOYLSTON STREET</AddressLine1>
          <City>CHESTNUT HILL</City>
          <State>MA</State>
          <ZIPCode>02467</ZIPCode>
        </AddressUS>
        <EIN>208069837</EIN>
        <PrimaryActivities>TO OWN, PRESERVE AND MAINTAIN 400 BEACON STREET PROPERTY.</PrimaryActivities>
        <LegalDomicileState>MA</LegalDomicileState>
        <ExemptCodeSection>501(C)(3)</ExemptCodeSection>
        <PublicCharityStatus>LINE 11A, I</PublicCharityStatus>
        <ControlledOrg>0</ControlledOrg>
      </Form990ScheduleRPartII>
      <Form990ScheduleRPartIV>
        <NameOfRelatedOrg>
          <BusinessNameLine1>MARY BEECHER LONGYEAR TRUST</BusinessNameLine1>
        </NameOfRelatedOrg>
        <AddressUS>
          <AddressLine1>1650 MARKET STREET SUITE 1200</AddressLine1>
          <City>PHILADELPHIA</City>
          <State>PA</State>
          <ZIPCode>19103</ZIPCode>
        </AddressUS>
        <EIN>046011948</EIN>
        <PrimaryActivity>TO PROVIDE ANNUAL AND OTHER DISTRIBUTIONS TO THE FOUNDATION</PrimaryActivity>
        <LegalDomicileState>PA</LegalDomicileState>
        <DirectControllingEntityNA>N/A</DirectControllingEntityNA>
        <TypeOfEntity>T</TypeOfEntity>
      </Form990ScheduleRPartIV>
      <ReceiptOfIntAnnRentsRoyalties>0</ReceiptOfIntAnnRentsRoyalties>
      <GiftGrantOrCapContrToOtherOrg>0</GiftGrantOrCapContrToOtherOrg>
      <GiftGrantOrCapContrFrOtherOrg>0</GiftGrantOrCapContrFrOtherOrg>
      <LoansOrGuaranteesToOtherOrg>0</LoansOrGuaranteesToOtherOrg>
      <LoansOrGuaranteesFromOtherOrg>0</LoansOrGuaranteesFromOtherOrg>
      <SaleOfAssetsToOtherOrg>0</SaleOfAssetsToOtherOrg>
      <PurchaseOfAssetsFromOtherOrg>0</PurchaseOfAssetsFromOtherOrg>
      <ExchangeOfAssets>0</ExchangeOfAssets>
      <RentalOfFacilitiesToOtherOrgs>0</RentalOfFacilitiesToOtherOrgs>
      <RentalOfFacilitiesFrOtherOrgs>0</RentalOfFacilitiesFrOtherOrgs>
      <PerformOfServicesForOtherOrgs>0</PerformOfServicesForOtherOrgs>
      <PerformOfServicesByOtherOrgs>0</PerformOfServicesByOtherOrgs>
      <SharingOfFacilities>1</SharingOfFacilities>
      <SharingOfPaidEmployees>0</SharingOfPaidEmployees>
      <ReimbursementPaidToOtherOrg>0</ReimbursementPaidToOtherOrg>
      <ReimbursementPaidByOtherOrg>0</ReimbursementPaidByOtherOrg>
      <OtherTransferToOtherOrg>0</OtherTransferToOtherOrg>
      <OtherTransferFromOtherOrg>1</OtherTransferFromOtherOrg>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>FOUR HUNDRED BEACON CORPORATION</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>M</TransactionType>
        <AmountInvolved>0</AmountInvolved>
      </TransactionsRelatedOrgsTable>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>MARY BEECHER LONGYEAR TRUST</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>R</TransactionType>
        <AmountInvolved>1247024</AmountInvolved>
      </TransactionsRelatedOrgsTable>
    </IRS990ScheduleR>
  </ReturnData>
</Return>