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        <TotalAmt>21914184</TotalAmt>
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      <First5Years509Ind>X</First5Years509Ind>
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        <FormAndLineReferenceDesc>PART III, SHORT YEAR EXPLANATION:</FormAndLineReferenceDesc>
        <ExplanationTxt>2023 IS A SHORT YEAR FOR THE PERIOD 4/24/2023 - 12/31/2023, BECAUSE THE ORGANIZATION WAS INITIALLY FORMED ON 4/24/2023 WHEN ARTICLES OF INCORPORATION WERE FILED WITH THE STATE OF CALIFORNIA.</ExplanationTxt>
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          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <AssetsIncludedAmt>275729</AssetsIncludedAmt>
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        <BookValueAmt>16340000</BookValueAmt>
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      <BuildingsGrp>
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        <BookValueAmt>4742697</BookValueAmt>
      </BuildingsGrp>
      <TotalBookValueLandBuildingsAmt>21082697</TotalBookValueLandBuildingsAmt>
      <TotalRevEtcAuditedFinclStmtAmt>19292717</TotalRevEtcAuditedFinclStmtAmt>
      <RevenueNotReportedAmt>0</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>19292717</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>2530430</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>2530430</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>21823147</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>18376</TotExpnsEtcAuditedFinclStmtAmt>
      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>18376</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>416318</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>416318</ExpensesNotRptFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>IN ADDITION TO RECEIVING THE CONTRIBUTIONS THE REAL PROPERTY AND RESIDENCE AT 40 BAYWOOD AVENUE, THE ORGANIZATION RECEIVED THE HOME'S COLLECTION OF 74 ITEMS OR SETS OF FINE ART AND FURNISHINGS, AND ALSO THE HOME'S 1,200 VOLUME LIBRARY OF 19TH &amp; 20TH CENTURY ENGLISH &amp; AMERICAN LITERATURE INCLUDING MANY FIRST EDITIONS. PRESERVATION AND MAINTENANCE OF THE RESIDENCE, INCLUDING THE HOME'S COLLECTIONS, IS ONE OF THE MAIN EXEMPT PURPOSES OF THE ORGANIZATION. IN ADDITION TO PRESERVATION, EDUCATION AND EXHIBITION OF THE COLLECTIONS TO THE GENERAL PUBLIC IS ALSO ONE OF THE MAIN EXEMPT PURPOSES OF THE ORGANIZATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI LINE 4B:</FormAndLineReferenceDesc>
        <ExplanationTxt>$1,112,898 CASH CONTRIBUTIONS FROM LILIIENTHAL TRUST A $1,417,765 CONTRIB OF RENOVATIONS-IN-PROGRESS FROM LILIENTHAL TRUST A ($233) LOSS ON SALE OF LIGHTING SCONCES</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII LINE 4B:</FormAndLineReferenceDesc>
        <ExplanationTxt>$285,958 - PROGRAM SERVICE &amp; ADMIN EXPENSES PAID BY LILIENTHAL TRUST A</ExplanationTxt>
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      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
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        <TitleTxt>PRESIDENT/CEO</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>385780</CompensationBasedOnRltdOrgsAmt>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>385780</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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            <BusinessNameLine1Txt>LASSAHN FIDUCIARY SERVICES</BusinessNameLine1Txt>
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        <RelationshipDescriptionTxt>T. ANNE LASSAHN IS THE CEO OF BOTH THE ORG AND LASASHN FIDUCIARY SERVICES</RelationshipDescriptionTxt>
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        <FormAndLineReferenceDesc>FORM 990 PART IV (PAGE 4), LINES 28A, 28B, AND 28C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION RECEIVED SIGNIFICANT CASH AND NONCASH CONTRIBUTIONS FROM A TRUST CONTROLLED BY THE ORGANIZATION'S CEO AND BOARD CHAIR T. ANNE LASSAHN. THE CONTRIBUTIONS FROM THE TRUST INCLUDED THE DONATED REAL PROPERTY AT 40 BAYWOOD AVENUE, THE COLLECTIONS OF FINE ART AND LIBRARY OF BOOKS, AND CASH TO FUND APPROXIMATELY $2 MILLION OF NEEDED RENOVATIONS AND REPAIRS TO THE PROPERTY.THE ORGANIZATION'S CEO AND BOARD CHAIR T. ANNE LASSAHN IS A PROFESSIONAL FIDUCIARY WHO OWNS LASSAHN FIDUCIARY SERVICES. THE ORGANIZATION DELEGATED PROJECT MANAGEMENT OF THE PROPERTY RENOVATIONS TO LASSAHN FIDUCIARY SERVICES.KARYN STILES CPA, THE ORGANIZATION'S TREASURER AND SECRETARY, IS ALSO A PROFESSIONAL FIDUCIARY AND AN EMPLOYEE OF LASSAHN FIDUCIARY SERVICES.</ExplanationTxt>
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        <NoncashContributionsRptF990Amt>219940</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>APPRAISAL</MethodOfDeterminingRevenuesTxt>
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      <BooksAndPublicationsGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <NoncashContributionsRptF990Amt>55789</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>APPRAISAL</MethodOfDeterminingRevenuesTxt>
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      <RealEstateResidentialGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>20417765</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>APPRAISAL, INVOICES PAID</MethodOfDeterminingRevenuesTxt>
      </RealEstateResidentialGrp>
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
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        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>ART: ONE CONTRIBUTION WAS MADE CONSISTING OF 74 TOTAL INDIVIDUAL ITEMS AND SETS/GROUPS OF LIKE ITEMS. BOOKS: ONE CONTRIBUTION WAS MADE CONSISTING OF A LIBRARY WITH APPROXIMATELY 1,200 VOLUMES. RESIDENTIAL REAL ESTATE: ONE CONTRIBUTION WAS MADE CONSISTING OF 2 ADJOINING PARCELS WITH ONE RESIDENCE AND IMPROVEMENTS-IN-PROGRESS AT 40 BAYWOOD AVENUE, HILLSBOROUGH CA 94010, APNS 032-431-210 &amp; 032-431-200.</ExplanationTxt>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>CEO T. ANNE LASSAHN IS A PROFESSIONAL FIDUCIARY AND IS THE OWNER AND AN EMPLOYEE OF LASSAHN FIDUCIARY SERVICES. TREASURER KARYN STILES IS ALSO A PROFESSIONAL FIDUCIARY AND AN EMPLOYEE OF LASSAHN FIDUCIARY SERVICES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION DELEGATED PROJECT MANAGEMENT OF PROPERTY RENOVATIONS TO LASSAHN FIDUCIARY SERVICES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8A</FormAndLineReferenceDesc>
        <ExplanationTxt>CURRENTLY THE ONLY OFFICERS ARE T. ANNE LASSAHN AND KARYN STILES. BECAUSE NO BOARD HAS BEEN RECRUITED YET, AND THERE ARE NO COMMITTEES, THERE HAVE BEEN NO FORMAL BOARD OR COMMITTEE MEETINGS YET. THE OFFICERS ARE CO-WORKERS AND REGULARLY COMMUNICATE ABOUT THE ORGANIZATION OUTSIDE OF A FORMAL MEETING DEDICATED SOLELY TO THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8B</FormAndLineReferenceDesc>
        <ExplanationTxt>CURRENTLY THE ONLY OFFICERS ARE T. ANNE LASSAHN AND KARYN STILES. BECAUSE NO BOARD HAS BEEN RECRUITED YET, AND THERE ARE NO COMMITTEES, THERE HAVE BEEN NO FORMAL BOARD OR COMMITTEE MEETINGS YET. THE OFFICERS ARE CO-WORKERS AND REGULARLY COMMUNICATE ABOUT THE ORGANIZATION OUTSIDE OF A FORMAL MEETING DEDICATED SOLELY TO THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE OFFICERS REVIEWED FORM 990 PRIOR TO SIGNING AND FILING.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION PROVIDES THE FOLLOWING DOCUMENTS TO THE PUBLIC PROMPTLY UPON REQUEST: GOVERNING &amp; ORGANIZATIONAL DOCUMENTS, POLICIES, FINANCIAL STATEMENTS, FEDERAL DETERMINATION LETTER, FORM 990-SERIES FILINGS</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 24E</FormAndLineReferenceDesc>
        <ExplanationTxt>PSA #1 ASSET MAINTENANCE: PROPERTY TAX: PROGRAM SERVICE EXPENSES 6,554. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 6,554. PSA #1 ASSET MAINTENANCE: GENERATOR SERVICE: PROGRAM SERVICE EXPENSES 3,900. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 3,900. PSA #1 ASSET MAINTENANCE: STORAGE: PROGRAM SERVICE EXPENSES 2,900. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 2,900. PSA #2: EDUCATIONAL EVENT SUPPLIES: PROGRAM SERVICE EXPENSES 2,755. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 2,755. PSA #3: COMMUNITY OUTREACH EVENT SUPPLIES: PROGRAM SERVICE EXPENSES 2,187. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 2,187. PSA #1 ASSET MAINTENANCE: PEST CONTROL: PROGRAM SERVICE EXPENSES 1,437. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 1,437. PSA #1 ASSET MAINTENANCE: SECURITY: PROGRAM SERVICE EXPENSES 1,053. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 1,053. PSA #1 ASSET MAINTENANCE: MISCELLANEOUS REPAIRS: PROGRAM SERVICE EXPENSES 449. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 449. BANK FEES &amp; BANK SUPPLIES: PROGRAM SERVICE EXPENSES 0. MANAGEMENT AND GENERAL EXPENSES 107. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 107. FILING &amp; NOTARY FEES: PROGRAM SERVICE EXPENSES 0. MANAGEMENT AND GENERAL EXPENSES 65. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 65.</ExplanationTxt>
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        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>2075 PIONEER COURT</AddressLine1Txt>
          <CityNm>SAN MATEO</CityNm>
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          <ZIPCd>94403</ZIPCd>
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        <LegalDomicileStateCd>CA</LegalDomicileStateCd>
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          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94403</ZIPCd>
        </USAddress>
        <EIN>453073438</EIN>
        <PrimaryActivitiesTxt>RENOVATIONS PROJECT MANAGEMENT</PrimaryActivitiesTxt>
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      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
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      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
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        <MethodOfAmountDeterminationTxt>APPRAISAL OF 40 BAYWOOD AVENUE</MethodOfAmountDeterminationTxt>
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        <TransactionTypeTxt>C</TransactionTypeTxt>
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        <MethodOfAmountDeterminationTxt>INVOICES PAID ON BEHALF OF ORG</MethodOfAmountDeterminationTxt>
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          <BusinessNameLine1Txt>LILIENTHAL TRUST A</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>C</TransactionTypeTxt>
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        <MethodOfAmountDeterminationTxt>APPRAISAL OF FINE ART COLLECTION</MethodOfAmountDeterminationTxt>
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        </OtherOrganizationName>
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        <MethodOfAmountDeterminationTxt>APPRAISAL OF LIBRARY COLLECTION</MethodOfAmountDeterminationTxt>
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        <TransactionTypeTxt>M</TransactionTypeTxt>
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        <MethodOfAmountDeterminationTxt>INVOICES PAID FOR MGMT SERVICES</MethodOfAmountDeterminationTxt>
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