<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2022v5.0">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2024-05-03T13:31:02-05:00</ReturnTs>
    <TaxPeriodEndDt>2023-06-30</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>363321958</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>Desmond &amp; Ahern Ltd</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>10827 S Western Avenue</AddressLine1Txt>
        <CityNm>Chicago</CityNm>
        <StateAbbreviationCd>IL</StateAbbreviationCd>
        <ZIPCd>60643</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990</ReturnTypeCd>
    <TaxPeriodBeginDt>2022-07-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>363991833</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>The CORE Foundation</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>CORE</BusinessNameControlTxt>
      <PhoneNum>3129425647</PhoneNum>
      <USAddress>
        <AddressLine1Txt>2020 W Harrison Street</AddressLine1Txt>
        <CityNm>Chicago</CityNm>
        <StateAbbreviationCd>IL</StateAbbreviationCd>
        <ZIPCd>60612</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Patricia S O'Neil</PersonNm>
      <PersonTitleTxt>Treasurer</PersonTitleTxt>
      <PhoneNum>3129425647</PhoneNum>
      <SignatureDt>2024-04-29</SignatureDt>
      <DiscussWithPaidPreparerInd>1</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <SigningOfficerGrp>
      <PersonFullName>
        <PersonFirstNm>Patricia</PersonFirstNm>
        <PersonLastNm>ONeil</PersonLastNm>
      </PersonFullName>
      <SSN>999009999</SSN>
    </SigningOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>1</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>Mel Padillo</PreparerPersonNm>
      <PTIN>P03172019</PTIN>
      <PhoneNum>7737794720</PhoneNum>
      <PreparationDt>2024-04-29</PreparationDt>
    </PreparerPersonGrp>
    <AdditionalFilerInformation>
      <TrustedCustomerGrp>
        <TrustedCustomerCd>2</TrustedCustomerCd>
        <AuthenticationAssuranceLevelCd>AAL1</AuthenticationAssuranceLevelCd>
        <IdentityAssuranceLevelCd>IAL1</IdentityAssuranceLevelCd>
      </TrustedCustomerGrp>
    </AdditionalFilerInformation>
    <TaxYr>2022</TaxYr>
    <BuildTS>2023-04-26 12:10:37Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="6">
    <IRS990 documentId="RetDoc1038000001" referenceDocumentId="RetDoc1044400001">
      <FinalReturnInd>X</FinalReturnInd>
      <PrincipalOfficerNm>Patricia S O'Neil</PrincipalOfficerNm>
      <USAddress>
        <AddressLine1Txt>1725 W Harrison Suite 364</AddressLine1Txt>
        <CityNm>Chicago</CityNm>
        <StateAbbreviationCd>IL</StateAbbreviationCd>
        <ZIPCd>60612</ZIPCd>
      </USAddress>
      <GrossReceiptsAmt>84228</GrossReceiptsAmt>
      <GroupReturnForAffiliatesInd>0</GroupReturnForAffiliatesInd>
      <Organization501c3Ind>X</Organization501c3Ind>
      <WebsiteAddressTxt>n/a</WebsiteAddressTxt>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <FormationYr>1994</FormationYr>
      <LegalDomicileStateCd>IL</LegalDomicileStateCd>
      <ActivityOrMissionDesc>To promote and support the work of an outpatient facility.</ActivityOrMissionDesc>
      <ContractTerminationInd>X</ContractTerminationInd>
      <VotingMembersGoverningBodyCnt>9</VotingMembersGoverningBodyCnt>
      <VotingMembersIndependentCnt>3</VotingMembersIndependentCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <TotalVolunteersCnt>9</TotalVolunteersCnt>
      <TotalGrossUBIAmt>0</TotalGrossUBIAmt>
      <NetUnrelatedBusTxblIncmAmt>0</NetUnrelatedBusTxblIncmAmt>
      <PYContributionsGrantsAmt>11</PYContributionsGrantsAmt>
      <CYContributionsGrantsAmt>0</CYContributionsGrantsAmt>
      <PYProgramServiceRevenueAmt>51830</PYProgramServiceRevenueAmt>
      <CYProgramServiceRevenueAmt>2088</CYProgramServiceRevenueAmt>
      <PYInvestmentIncomeAmt>338599</PYInvestmentIncomeAmt>
      <CYInvestmentIncomeAmt>43965</CYInvestmentIncomeAmt>
      <PYOtherRevenueAmt>1500</PYOtherRevenueAmt>
      <CYOtherRevenueAmt>11693</CYOtherRevenueAmt>
      <PYTotalRevenueAmt>391940</PYTotalRevenueAmt>
      <CYTotalRevenueAmt>57746</CYTotalRevenueAmt>
      <PYGrantsAndSimilarPaidAmt>1179755</PYGrantsAndSimilarPaidAmt>
      <CYGrantsAndSimilarPaidAmt>24982</CYGrantsAndSimilarPaidAmt>
      <PYBenefitsPaidToMembersAmt>0</PYBenefitsPaidToMembersAmt>
      <CYBenefitsPaidToMembersAmt>0</CYBenefitsPaidToMembersAmt>
      <PYSalariesCompEmpBnftPaidAmt>198418</PYSalariesCompEmpBnftPaidAmt>
      <CYSalariesCompEmpBnftPaidAmt>82453</CYSalariesCompEmpBnftPaidAmt>
      <PYTotalProfFndrsngExpnsAmt>0</PYTotalProfFndrsngExpnsAmt>
      <CYTotalProfFndrsngExpnsAmt>0</CYTotalProfFndrsngExpnsAmt>
      <CYTotalFundraisingExpenseAmt>0</CYTotalFundraisingExpenseAmt>
      <PYOtherExpensesAmt>296132</PYOtherExpensesAmt>
      <CYOtherExpensesAmt>10558267</CYOtherExpensesAmt>
      <PYTotalExpensesAmt>1674305</PYTotalExpensesAmt>
      <CYTotalExpensesAmt>10665702</CYTotalExpensesAmt>
      <PYRevenuesLessExpensesAmt>-1282365</PYRevenuesLessExpensesAmt>
      <CYRevenuesLessExpensesAmt>-10607956</CYRevenuesLessExpensesAmt>
      <TotalAssetsBOYAmt>10986019</TotalAssetsBOYAmt>
      <TotalAssetsEOYAmt>0</TotalAssetsEOYAmt>
      <TotalLiabilitiesBOYAmt>78878</TotalLiabilitiesBOYAmt>
      <TotalLiabilitiesEOYAmt>0</TotalLiabilitiesEOYAmt>
      <NetAssetsOrFundBalancesBOYAmt>10907141</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>0</NetAssetsOrFundBalancesEOYAmt>
      <MissionDesc>The CORE Foundation promotes &amp; supports the work of the Ruth M. Rothstein CORE Center for prevention, care &amp; research of HIV/AIDS &amp; other related infectious diseases.</MissionDesc>
      <SignificantNewProgramSrvcInd>0</SignificantNewProgramSrvcInd>
      <SignificantChangeInd>0</SignificantChangeInd>
      <ExpenseAmt>10634284</ExpenseAmt>
      <GrantAmt>24982</GrantAmt>
      <RevenueAmt>13781</RevenueAmt>
      <Desc>Provided support for the CORE Center's research activities.</Desc>
      <TotalProgramServiceExpensesAmt>10634284</TotalProgramServiceExpensesAmt>
      <DescribedInSection501c3Ind referenceDocumentId="RetDoc1039100001">1</DescribedInSection501c3Ind>
      <ScheduleBRequiredInd>0</ScheduleBRequiredInd>
      <PoliticalCampaignActyInd>0</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>0</LobbyingActivitiesInd>
      <SubjectToProxyTaxInd>0</SubjectToProxyTaxInd>
      <DonorAdvisedFundInd>0</DonorAdvisedFundInd>
      <ConservationEasementsInd>0</ConservationEasementsInd>
      <CollectionsOfArtInd>0</CollectionsOfArtInd>
      <CreditCounselingInd>0</CreditCounselingInd>
      <DonorRstrOrQuasiEndowmentsInd>0</DonorRstrOrQuasiEndowmentsInd>
      <ReportLandBuildingEquipmentInd>0</ReportLandBuildingEquipmentInd>
      <ReportInvestmentsOtherSecInd>0</ReportInvestmentsOtherSecInd>
      <ReportProgramRelatedInvstInd>0</ReportProgramRelatedInvstInd>
      <ReportOtherAssetsInd>0</ReportOtherAssetsInd>
      <ReportOtherLiabilitiesInd>0</ReportOtherLiabilitiesInd>
      <IncludeFIN48FootnoteInd>0</IncludeFIN48FootnoteInd>
      <IndependentAuditFinclStmtInd>0</IndependentAuditFinclStmtInd>
      <ConsolidatedAuditFinclStmtInd>0</ConsolidatedAuditFinclStmtInd>
      <SchoolOperatingInd>0</SchoolOperatingInd>
      <ForeignOfficeInd>0</ForeignOfficeInd>
      <ForeignActivitiesInd>0</ForeignActivitiesInd>
      <MoreThan5000KToOrgInd>0</MoreThan5000KToOrgInd>
      <MoreThan5000KToIndividualsInd>0</MoreThan5000KToIndividualsInd>
      <ProfessionalFundraisingInd>0</ProfessionalFundraisingInd>
      <FundraisingActivitiesInd>0</FundraisingActivitiesInd>
      <GamingActivitiesInd>0</GamingActivitiesInd>
      <OperateHospitalInd>0</OperateHospitalInd>
      <GrantsToOrganizationsInd referenceDocumentId="RetDoc1041900001">1</GrantsToOrganizationsInd>
      <GrantsToIndividualsInd referenceDocumentId="RetDoc1041900001">0</GrantsToIndividualsInd>
      <ScheduleJRequiredInd>0</ScheduleJRequiredInd>
      <TaxExemptBondsInd>0</TaxExemptBondsInd>
      <EngagedInExcessBenefitTransInd>0</EngagedInExcessBenefitTransInd>
      <PYExcessBenefitTransInd>0</PYExcessBenefitTransInd>
      <LoanOutstandingInd>0</LoanOutstandingInd>
      <GrantToRelatedPersonInd>0</GrantToRelatedPersonInd>
      <BusinessRlnWithOrgMemInd>0</BusinessRlnWithOrgMemInd>
      <BusinessRlnWithFamMemInd>0</BusinessRlnWithFamMemInd>
      <BusinessRlnWith35CtrlEntInd>0</BusinessRlnWith35CtrlEntInd>
      <DeductibleNonCashContriInd>0</DeductibleNonCashContriInd>
      <DeductibleArtContributionInd>0</DeductibleArtContributionInd>
      <TerminateOperationsInd referenceDocumentId="RetDoc1043100001">1</TerminateOperationsInd>
      <PartialLiquidationInd referenceDocumentId="RetDoc1043100001">0</PartialLiquidationInd>
      <DisregardedEntityInd referenceDocumentId="RetDoc1043400001">0</DisregardedEntityInd>
      <RelatedEntityInd referenceDocumentId="RetDoc1043400001">1</RelatedEntityInd>
      <RelatedOrganizationCtrlEntInd>0</RelatedOrganizationCtrlEntInd>
      <TrnsfrExmptNonChrtblRltdOrgInd referenceDocumentId="RetDoc1043400001">0</TrnsfrExmptNonChrtblRltdOrgInd>
      <ActivitiesConductedPrtshpInd referenceDocumentId="RetDoc1043400001">0</ActivitiesConductedPrtshpInd>
      <ScheduleORequiredInd>1</ScheduleORequiredInd>
      <IRPDocumentCnt>1</IRPDocumentCnt>
      <IRPDocumentW2GCnt>0</IRPDocumentW2GCnt>
      <BackupWthldComplianceInd>1</BackupWthldComplianceInd>
      <EmployeeCnt>0</EmployeeCnt>
      <UnrelatedBusIncmOverLimitInd>0</UnrelatedBusIncmOverLimitInd>
      <ForeignFinancialAccountInd>0</ForeignFinancialAccountInd>
      <ProhibitedTaxShelterTransInd>0</ProhibitedTaxShelterTransInd>
      <TaxablePartyNotificationInd>0</TaxablePartyNotificationInd>
      <NondeductibleContributionsInd>0</NondeductibleContributionsInd>
      <QuidProQuoContributionsInd>0</QuidProQuoContributionsInd>
      <Form8282PropertyDisposedOfInd>0</Form8282PropertyDisposedOfInd>
      <RcvFndsToPayPrsnlBnftCntrctInd>0</RcvFndsToPayPrsnlBnftCntrctInd>
      <PayPremiumsPrsnlBnftCntrctInd>0</PayPremiumsPrsnlBnftCntrctInd>
      <IndoorTanningServicesInd>0</IndoorTanningServicesInd>
      <SubjToTaxRmnrtnExPrchtPymtInd>0</SubjToTaxRmnrtnExPrchtPymtInd>
      <SubjectToExcsTaxNetInvstIncInd>0</SubjectToExcsTaxNetInvstIncInd>
      <InfoInScheduleOPartVIInd>X</InfoInScheduleOPartVIInd>
      <GoverningBodyVotingMembersCnt>9</GoverningBodyVotingMembersCnt>
      <IndependentVotingMemberCnt>3</IndependentVotingMemberCnt>
      <FamilyOrBusinessRlnInd>1</FamilyOrBusinessRlnInd>
      <DelegationOfMgmtDutiesInd>0</DelegationOfMgmtDutiesInd>
      <ChangeToOrgDocumentsInd>0</ChangeToOrgDocumentsInd>
      <MaterialDiversionOrMisuseInd>0</MaterialDiversionOrMisuseInd>
      <MembersOrStockholdersInd>0</MembersOrStockholdersInd>
      <ElectionOfBoardMembersInd>0</ElectionOfBoardMembersInd>
      <DecisionsSubjectToApprovaInd>0</DecisionsSubjectToApprovaInd>
      <MinutesOfGoverningBodyInd>1</MinutesOfGoverningBodyInd>
      <MinutesOfCommitteesInd>1</MinutesOfCommitteesInd>
      <OfficerMailingAddressInd>0</OfficerMailingAddressInd>
      <LocalChaptersInd>0</LocalChaptersInd>
      <Form990ProvidedToGvrnBodyInd>0</Form990ProvidedToGvrnBodyInd>
      <ConflictOfInterestPolicyInd>1</ConflictOfInterestPolicyInd>
      <AnnualDisclosureCoveredPrsnInd>1</AnnualDisclosureCoveredPrsnInd>
      <RegularMonitoringEnfrcInd>1</RegularMonitoringEnfrcInd>
      <WhistleblowerPolicyInd>1</WhistleblowerPolicyInd>
      <DocumentRetentionPolicyInd>1</DocumentRetentionPolicyInd>
      <CompensationProcessCEOInd>0</CompensationProcessCEOInd>
      <CompensationProcessOtherInd>0</CompensationProcessOtherInd>
      <InvestmentInJointVentureInd>0</InvestmentInJointVentureInd>
      <StatesWhereCopyOfReturnIsFldCd>IL</StatesWhereCopyOfReturnIsFldCd>
      <UponRequestInd>X</UponRequestInd>
      <BooksInCareOfDetail>
        <BusinessName>
          <BusinessNameLine1Txt>Patricia S O'Neil</BusinessNameLine1Txt>
        </BusinessName>
        <PhoneNum>3129425647</PhoneNum>
        <USAddress>
          <AddressLine1Txt>1725 W Harrison Suite 364</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60612</ZIPCd>
        </USAddress>
      </BooksInCareOfDetail>
      <Form990PartVIISectionAGrp>
        <PersonNm>See Schedule O for</PersonNm>
        <TitleTxt>Board of Directors</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Esther Joo</PersonNm>
        <TitleTxt>Executive Director</TitleTxt>
        <AverageHoursPerWeekRt>40.00</AverageHoursPerWeekRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>68430</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>68430</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>0</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>0</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>0</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <CntrctRcvdGreaterThan100KCnt>0</CntrctRcvdGreaterThan100KCnt>
      <ProgramServiceRevenueGrp>
        <Desc>Clinical Trials</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>2088</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>2088</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>2088</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>70447</TotalRevenueColumnAmt>
        <ExclusionAmt>70447</ExclusionAmt>
      </InvestmentIncomeGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>26482</SecuritiesAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>-26482</SecuritiesAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>-26482</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>-26482</RelatedOrExemptFuncIncomeAmt>
      </NetGainOrLossInvestmentsGrp>
      <OtherRevenueMiscGrp>
        <Desc>Miscellaneous</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>11693</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>11693</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>11693</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>57746</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>-12701</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>70447</ExclusionAmt>
      </TotalRevenueGrp>
      <GrantsToDomesticOrgsGrp>
        <TotalAmt>24982</TotalAmt>
        <ProgramServicesAmt>24982</ProgramServicesAmt>
      </GrantsToDomesticOrgsGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>68430</TotalAmt>
        <ProgramServicesAmt>68430</ProgramServicesAmt>
      </CompCurrentOfcrDirectorsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>14023</TotalAmt>
        <ProgramServicesAmt>14023</ProgramServicesAmt>
      </PayrollTaxesGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>6349</TotalAmt>
        <ManagementAndGeneralAmt>6349</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>24675</TotalAmt>
        <ManagementAndGeneralAmt>24675</ManagementAndGeneralAmt>
      </FeesForSrvcInvstMgmntFeesGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>28380</TotalAmt>
        <ProgramServicesAmt>28380</ProgramServicesAmt>
      </FeesForServicesOtherGrp>
      <OfficeExpensesGrp>
        <TotalAmt>394</TotalAmt>
        <ManagementAndGeneralAmt>394</ManagementAndGeneralAmt>
      </OfficeExpensesGrp>
      <InsuranceGrp>
        <TotalAmt>6574</TotalAmt>
        <ProgramServicesAmt>6574</ProgramServicesAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>Contribution-Cash</Desc>
        <TotalAmt>10331062</TotalAmt>
        <ProgramServicesAmt>10331062</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Contribution-NonCasl</Desc>
        <TotalAmt>148990</TotalAmt>
        <ProgramServicesAmt>148990</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Revenue transfer (out</Desc>
        <TotalAmt>8662</TotalAmt>
        <ProgramServicesAmt>8662</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>Indirect</Desc>
        <TotalAmt>3031</TotalAmt>
        <ProgramServicesAmt>3031</ProgramServicesAmt>
      </OtherExpensesGrp>
      <AllOtherExpensesGrp>
        <TotalAmt>150</TotalAmt>
        <ProgramServicesAmt>150</ProgramServicesAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>10665702</TotalAmt>
        <ProgramServicesAmt>10634284</ProgramServicesAmt>
        <ManagementAndGeneralAmt>31418</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
      </TotalFunctionalExpensesGrp>
      <CashNonInterestBearingGrp>
        <BOYAmt>408646</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <EOYAmt>0</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <PledgesAndGrantsReceivableGrp>
        <EOYAmt>0</EOYAmt>
      </PledgesAndGrantsReceivableGrp>
      <AccountsReceivableGrp>
        <BOYAmt>13552</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </AccountsReceivableGrp>
      <ReceivablesFromOfficersEtcGrp>
        <EOYAmt>0</EOYAmt>
      </ReceivablesFromOfficersEtcGrp>
      <RcvblFromDisqualifiedPrsnGrp>
        <EOYAmt>0</EOYAmt>
      </RcvblFromDisqualifiedPrsnGrp>
      <OthNotesLoansReceivableNetGrp>
        <EOYAmt>0</EOYAmt>
      </OthNotesLoansReceivableNetGrp>
      <InventoriesForSaleOrUseGrp>
        <EOYAmt>0</EOYAmt>
      </InventoriesForSaleOrUseGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>160</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipBasisNetGrp>
        <EOYAmt>0</EOYAmt>
      </LandBldgEquipBasisNetGrp>
      <InvestmentsPubTradedSecGrp>
        <BOYAmt>10364959</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </InvestmentsPubTradedSecGrp>
      <InvestmentsOtherSecuritiesGrp>
        <EOYAmt>0</EOYAmt>
      </InvestmentsOtherSecuritiesGrp>
      <InvestmentsProgramRelatedGrp>
        <EOYAmt>0</EOYAmt>
      </InvestmentsProgramRelatedGrp>
      <IntangibleAssetsGrp>
        <EOYAmt>0</EOYAmt>
      </IntangibleAssetsGrp>
      <OtherAssetsTotalGrp>
        <BOYAmt>198702</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </OtherAssetsTotalGrp>
      <TotalAssetsGrp>
        <BOYAmt>10986019</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>78878</BOYAmt>
      </AccountsPayableAccrExpnssGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>78878</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>10907141</BOYAmt>
        <EOYAmt>22684413</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <DonorRestrictionNetAssetsGrp>
        <EOYAmt>-22684413</EOYAmt>
      </DonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>10907141</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>10986019</BOYAmt>
        <EOYAmt>0</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-10607956</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>-299185</NetUnrlzdGainsLossesInvstAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>0</FSAuditedInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <SupportingOrganization509a3Ind>X</SupportingOrganization509a3Ind>
      <SupportingOrgType1Ind>X</SupportingOrgType1Ind>
      <IRSWrittenDeterminationInd>X</IRSWrittenDeterminationInd>
      <SupportedOrganizationsCnt>1</SupportedOrganizationsCnt>
      <SupportedOrgInformationGrp>
        <SupportedOrganizationName>
          <BusinessNameLine1Txt>County of Cook</BusinessNameLine1Txt>
        </SupportedOrganizationName>
        <EIN>366006541</EIN>
        <OrganizationTypeCd>6</OrganizationTypeCd>
        <GoverningDocumentListedInd>1</GoverningDocumentListedInd>
        <SupportAmt>0</SupportAmt>
        <OtherSupportAmt>0</OtherSupportAmt>
      </SupportedOrgInformationGrp>
      <SupportedOrganizationsTotalCnt>1</SupportedOrganizationsTotalCnt>
      <SupportSumAmt>0</SupportSumAmt>
      <OtherSupportSumAmt>0</OtherSupportSumAmt>
      <Form990SchASupportingOrgGrp>
        <ListedByNameGoverningDocInd>1</ListedByNameGoverningDocInd>
        <SuprtOrgNoIRSDeterminationInd>0</SuprtOrgNoIRSDeterminationInd>
        <SupportedOrgSectionC456Ind>0</SupportedOrgSectionC456Ind>
        <SupportedOrgNotOrganizedUSInd>0</SupportedOrgNotOrganizedUSInd>
        <OrganizationChangeSuprtOrgInd>0</OrganizationChangeSuprtOrgInd>
        <SupportNonSupportedOrgInd>0</SupportNonSupportedOrgInd>
        <PaymentSubstantialContribtrInd>0</PaymentSubstantialContribtrInd>
        <LoanDisqualifiedPersonInd>0</LoanDisqualifiedPersonInd>
        <ControlledDisqualifiedPrsnInd>0</ControlledDisqualifiedPrsnInd>
        <DisqualifiedPrsnControllIntInd>0</DisqualifiedPrsnControllIntInd>
        <DisqualifiedPrsnOwnrIntInd>0</DisqualifiedPrsnOwnrIntInd>
        <ExcessBusinessHoldingsRulesInd>0</ExcessBusinessHoldingsRulesInd>
        <ContributionControllerInd>0</ContributionControllerInd>
        <ContributionFamilyInd>0</ContributionFamilyInd>
        <Contribution35ControlledInd>0</Contribution35ControlledInd>
      </Form990SchASupportingOrgGrp>
      <Form990SchAType1SuprtOrgGrp>
        <PowerAppointMajorityDirTrstInd>1</PowerAppointMajorityDirTrstInd>
        <OperateBenefitNonSuprtOrgInd>0</OperateBenefitNonSuprtOrgInd>
      </Form990SchAType1SuprtOrgGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>0</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Hektoen Institute LLC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1339 S Wood Suite G</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60608</ZIPCd>
        </USAddress>
        <CashGrantAmt>0</CashGrantAmt>
        <NonCashAssistanceAmt>24982</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>General operating</PurposeOfGrantTxt>
      </RecipientTable>
    </IRS990ScheduleI>
    <IRS990ScheduleN documentId="RetDoc1043100001">
      <LiquidationOfAssetsTableGrp>
        <LiquidationOfAssetsDetail>
          <AssetsDistriOrExpnssPaidDesc>Cash</AssetsDistriOrExpnssPaidDesc>
          <DistributionDt>2020-11-11</DistributionDt>
          <FairMarketValueOfAssetAmt>5165531</FairMarketValueOfAssetAmt>
          <EIN>366006541</EIN>
          <BusinessName>
            <BusinessNameLine1Txt>Cook County</BusinessNameLine1Txt>
          </BusinessName>
          <USAddress>
            <AddressLine1Txt>118 N Clark</AddressLine1Txt>
            <CityNm>Chicago</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60602</ZIPCd>
          </USAddress>
        </LiquidationOfAssetsDetail>
        <LiquidationOfAssetsDetail>
          <AssetsDistriOrExpnssPaidDesc>Cash</AssetsDistriOrExpnssPaidDesc>
          <DistributionDt>2020-11-10</DistributionDt>
          <FairMarketValueOfAssetAmt>5165531</FairMarketValueOfAssetAmt>
          <EIN>362174823</EIN>
          <BusinessName>
            <BusinessNameLine1Txt>Rush University Medical Center</BusinessNameLine1Txt>
          </BusinessName>
          <USAddress>
            <AddressLine1Txt>1700 W Van Buren</AddressLine1Txt>
            <CityNm>Chicago</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60612</ZIPCd>
          </USAddress>
        </LiquidationOfAssetsDetail>
      </LiquidationOfAssetsTableGrp>
      <DirectorOfSuccessorInd>0</DirectorOfSuccessorInd>
      <EmployeeOfSuccessorInd>0</EmployeeOfSuccessorInd>
      <OwnerOfSuccessorInd>0</OwnerOfSuccessorInd>
      <ReceiveCompensationInd>0</ReceiveCompensationInd>
      <AssetsDistributedInd>0</AssetsDistributedInd>
      <RequiredToNotifyAGInd>0</RequiredToNotifyAGInd>
      <AttorneyGeneralNotifiedInd>0</AttorneyGeneralNotifiedInd>
      <LiabilitiesPaidInd>0</LiabilitiesPaidInd>
      <BondsOutstandingInd>0</BondsOutstandingInd>
    </IRS990ScheduleN>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>The following Board Directors/Officer are employed by Rush University Medical Center: Omar Lateef, Esther Joo (Non-voting Officer), Robert Weinstein MD, and Patricia O'Neil. The following Board Directors are on the Board of Trustees of Rush University Medical Center: Peter C. B. Bynoe and Thomas Lanctot. The following Board Directors are employed by the County of Cook: John P. Daley, Israel Rocha, Jr., and David N. Schwartz MD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The 990 was reviewed by the Executive Director, Board Treasurer, and the Finance Committee prior to filing. The Finance Committee makes a report to the Board regarding the review of Form 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization requires each board director and key employee to complete a questionnaire concerning possible conflicts of interest annually and requests that they update their responses if circumstances change throughout the year.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The CORE Foundation makes these documents available upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part I, Line 5:</FormAndLineReferenceDesc>
        <ExplanationTxt>The CORE Foundation leased 1 person who was employed through Rush University Medical Center, a related tax exempt organization (FEIN 36-2174823). 2021 W-2 and payroll tax returns were prepared and issued by Rush.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Page 7, Part VII, Section A:</FormAndLineReferenceDesc>
        <ExplanationTxt>The CORE Foundation does not compensate any directors or board officers for board duties. Several board directors are compensated as employees by related organizations, with no compensation allocated to the Foundation. Compensation information of the Foundation's related entities is available at the respective locations. Each officer and director volunteers approximately one hour per week for Foundation business. Name and Board Position Related Entity and relationship John P. Daley County of Cook President Employee Omar Lateef, DO Rush University Medical Center Executive Vice President Employee Israel Rocha, Jr. County of Cook Executive Vice President Employee Thomas Lanctot Rush University Medical Center Vice President and Secretary Trustee Patricia S. O'Neil Rush University Medical Center Treasurer Employee Peter C. B. Bynoe Rush University Medical Center Director Trustee Mildred Williamson None Director None David N. Schwartz, MD County of Cook Director Employee Robert A. Weinstein, MD Rush Univ Medical Center Director Employee County of Cook - Volunteer</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>County of Cook</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>118 N Clark</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60602</ZIPCd>
        </USAddress>
        <EIN>366006541</EIN>
        <PrimaryActivitiesTxt>medical care</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>Rush University Medical Center</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>1700 W Van Buren</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60612</ZIPCd>
        </USAddress>
        <EIN>362174823</EIN>
        <PrimaryActivitiesTxt>medical care</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 7</PublicCharityStatusTxt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>Rush University Medical Center</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>P</TransactionTypeTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>
