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      <OtherSecurities>
        <Description>Priv. Eq. - Adam Street Partners</Description>
        <BookValue>1003847</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
      </OtherSecurities>
      <OtherSecurities>
        <Description>Priv. Eq. - Bear Stearns</Description>
        <BookValue>124009</BookValue>
        <MethodOfValuation>F</MethodOfValuation>
      </OtherSecurities>
      <TotalOfBookValueSecurities>28952523</TotalOfBookValueSecurities>
      <TotalRevenue>19829194</TotalRevenue>
      <TotalExpenses>25561516</TotalExpenses>
      <ExcessOrDeficitForYear>-5732322</ExcessOrDeficitForYear>
      <NetUnrealizedGLOnInvestments>25374609</NetUnrealizedGLOnInvestments>
      <TotalAdjustments>25374609</TotalAdjustments>
      <ExcessOrDeficitPerFS>19642287</ExcessOrDeficitPerFS>
      <TotRevenueEtcAuditedFinclStmt>46800855</TotRevenueEtcAuditedFinclStmt>
      <NetUnrealizedGainsInvestments>25374609</NetUnrealizedGainsInvestments>
      <OtherRevenues>-208889</OtherRevenues>
      <RevenueNotRptdF990>25165720</RevenueNotRptdF990>
      <RevenueSubtotal>21635135</RevenueSubtotal>
      <OtherRevenuesNotIncluded>-1805941</OtherRevenuesNotIncluded>
      <RevenueNotRptdOnFinStmt>-1805941</RevenueNotRptdOnFinStmt>
      <TotalRevenuePerForm990>19829194</TotalRevenuePerForm990>
      <TotExpensesEtcAuditedFinclStmt>27158568</TotExpensesEtcAuditedFinclStmt>
      <OtherExpensesIncluded>1805941</OtherExpensesIncluded>
      <ExpensesNotRptdF990>1805941</ExpensesNotRptdF990>
      <ExpensesSubtotal>25352627</ExpensesSubtotal>
      <OtherExpensesNotIncluded>208889</OtherExpensesNotIncluded>
      <ExpensesNotRptdOnFinStmt>208889</ExpensesNotRptdOnFinStmt>
      <TotalExpensesPerForm990>25561516</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIV>
        <Explanation>Part III, Line 1A: Capitalization Policy: Arboretum Collections - The Arboreturm's rare books and print collections are not capitalized in the accompanying audited financial statements. Living woody plants are also not capitalized unless they are a major part of a capital project. Purchases of collection items that are not capitalized are recorded as decreases in unrestricted net assets.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Explanation>Part III, Line 4: Description of Collections and Furtherance of Exempt Purpose: Living Collection - Woody plants in categories of taxonomic, geographic, special habitat, horticultural, rare/endangered. 222,490 specimens represent 4,277 different kinds of trees, shrubs and other plants from 40 countries in the northern temperate zone. Displayed across 1700 acres of natural landscapes. Provided for botanical, horticultural, and artistic study (education and research purposes) and enjoyment (cultural purpose). Herbarium Collection: Dried woody plant specimens totaling 187,000. Housed in research lab. Supports study of origin and evolution of plant species (scientific research purpose). Library Collection - 28,000 books and 110 periodicals on botany, horticulture, landscape design, natural history, ecology; corresponding rare documents, and other printed materials; 12,000 botanical artworks and 3,400 landscape drawings. Available for botanical, horticultural, and artistic study of plants (educational, research, and cultural purposes).</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Explanation>Part V, Line 4: Intended Use of Endowment Funds: The term endowments are spent per the donor's directions. The permanent endowment is maintained in perpetuity to support the mission and operations of the Arboretum. The board designated endowments are applied to purposes defined by the board in support of the mission and operations of the Arboretum.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Explanation>Part XII, Line 2D: Reconciliation: $208,889 of investment management fees netted against investment income on the audited financial statements.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Explanation>Part XII, Line 4B: Reconciliation: Cost of Sales of $1,674,784 and $131,157 of fundraising expenses are included in expenses on the audited financial statements.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Explanation>Part XIII, Line 2D: Reconciliation: Cost of sales of $1,674,784 and $131,157 of fundraising expenses are included in expenses on the audited financial statements.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Explanation>Part XIII, Line 4B: Reconciliation: Investment management fees of $208,889 netted against investment income on the audited financial statements.</Explanation>
      </Form990ScheduleDPartXIV>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <EventsInformation>
        <NameOfEvent1>Dinner Party</NameOfEvent1>
        <GrossReceiptsEvent1>214191</GrossReceiptsEvent1>
        <CharitableContributionsEvent1>177791</CharitableContributionsEvent1>
        <GrossRevenueEvent1>36400</GrossRevenueEvent1>
        <RentFacilityCostsEvent1>74464</RentFacilityCostsEvent1>
        <FoodAndBeverageEvent1>43456</FoodAndBeverageEvent1>
        <EntertainmentEvent1>1350</EntertainmentEvent1>
        <OtherDirectExpensesEvent1>11887</OtherDirectExpensesEvent1>
        <GrossReceiptsTotal>214191</GrossReceiptsTotal>
        <CharitableContributionsTotal>177791</CharitableContributionsTotal>
        <GrossRevenueTotalEvents>36400</GrossRevenueTotalEvents>
        <RentFacilityCostsTotalEvents>74464</RentFacilityCostsTotalEvents>
        <FoodAndBeverageTotalEvents>43456</FoodAndBeverageTotalEvents>
        <EntertainmentTotalEvents>1350</EntertainmentTotalEvents>
        <OtherDirectExpensesTotalEvents>11887</OtherDirectExpensesTotalEvents>
        <DirectExpenseSummaryEvents>131157</DirectExpenseSummaryEvents>
        <NetIncomeSummary>-94757</NetIncomeSummary>
      </EventsInformation>
    </IRS990ScheduleG>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <HousingAllowanceOrResidence>X</HousingAllowanceOrResidence>
      <PersonalServices>X</PersonalServices>
      <WrittenPolicyReTAndEExpenses>1</WrittenPolicyReTAndEExpenses>
      <SubstantiationRequired>1</SubstantiationRequired>
      <CompensationCommittee>X</CompensationCommittee>
      <Form990OfOtherOrganizations>X</Form990OfOtherOrganizations>
      <CompensationSurvey>X</CompensationSurvey>
      <BoardOrCommitteeApproval>X</BoardOrCommitteeApproval>
      <SeverancePayment>1</SeverancePayment>
      <SupplementalNonqualRetirePlan>1</SupplementalNonqualRetirePlan>
      <EquityBasedCompArrangement>0</EquityBasedCompArrangement>
      <CompBasedOnRevenueOfFilingOrg>0</CompBasedOnRevenueOfFilingOrg>
      <CompBasedOnRevenueRelatedOrgs>0</CompBasedOnRevenueRelatedOrgs>
      <CompBasedNetEarningsFilingOrg>0</CompBasedNetEarningsFilingOrg>
      <CompBasedNetEarningsRelateOrgs>0</CompBasedNetEarningsRelateOrgs>
      <AnyNonFixedPayments>0</AnyNonFixedPayments>
      <InitialContractException>0</InitialContractException>
      <Form990ScheduleJPartII>
        <NamePerson>Gerard T Donnelly PhD</NamePerson>
        <BaseCompensationFilingOrg>289839</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>14700</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>11576</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>316115</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>Timothy E Wolkober CPA</NamePerson>
        <BaseCompensationFilingOrg>144213</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>8866</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>8046</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>161125</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartII>
        <NamePerson>Jill Koski</NamePerson>
        <BaseCompensationFilingOrg>165385</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>10702</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>0</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>11576</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>0</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>187663</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>0</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
      </Form990ScheduleJPartII>
      <Form990ScheduleJPartIII>
        <ReturnReference>Part I, Line 1a</ReturnReference>
        <Explanation>A residence is provided for the President and CEO of the Arboretum, currently Gerard T. Donnelly, as a condition of employment and for the convenience of the Arboretum. The value of this residence is not treated as taxable compensation. Landscaping services are also provided for all Arboretum properties, including the President's residence.</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>Supplemental Information</Identifier>
        <ReturnReference>Part III</ReturnReference>
        <Explanation>Part I, Line 4a: Severance Payment Penn French, V.P. Marketing received a severance payment of $75,524 in connection with the termination of his employment. Part 1, line 4b: The following individuals participated in a section 457(b) Supplemental Non-Qualified Retirement Plan. The individuals are listed with the respective amounts of their deferrals: Gerard Donnelly - $16,500 Penn French - $3,333 Timothy Wolkober - $22,166 Donna Biernadski - $2,885</Explanation>
      </Form990ScheduleJPartIII>
    </IRS990ScheduleJ>
    <IRS990ScheduleK documentId="RetDoc1053100001">
      <Form990ScheduleKPartI>
        <IssuerName>
          <BusinessNameLine1>The County of Dupage Illinois</BusinessNameLine1>
        </IssuerName>
        <IssuerEIN>366006551</IssuerEIN>
        <CUSIPNumber>262668AC0</CUSIPNumber>
        <DateIssued>2003-12-17</DateIssued>
        <IssuePrice>42000000</IssuePrice>
        <DescriptionOfPurpose>See Schedule O</DescriptionOfPurpose>
        <Defeased>0</Defeased>
        <OnBehalfOfIssuer>0</OnBehalfOfIssuer>
        <PoolFinancing>0</PoolFinancing>
      </Form990ScheduleKPartI>
      <Form990ScheduleKPartII>
        <TotalProceeds>42155070</TotalProceeds>
        <IssuanceCostsFromProceeds>326250</IssuanceCostsFromProceeds>
        <WorkingCapitalExpenditures>1482400</WorkingCapitalExpenditures>
        <CapitalExpenditures>40346420</CapitalExpenditures>
        <YearOfSubstCompletion>2005</YearOfSubstCompletion>
        <CurrentRefunding>0</CurrentRefunding>
        <AdvanceRefunding>0</AdvanceRefunding>
        <FinalAllocationMade>1</FinalAllocationMade>
        <AdequateBooksAndRecdsMaintaind>1</AdequateBooksAndRecdsMaintaind>
      </Form990ScheduleKPartII>
      <Form990ScheduleKPartIII>
        <OwningBondFinancedProperty>0</OwningBondFinancedProperty>
        <AnyLeaseArrangements>0</AnyLeaseArrangements>
        <MngmentCntrctBondFinancdPrprty>0</MngmentCntrctBondFinancdPrprty>
        <AnyResearchAgreements>0</AnyResearchAgreements>
        <BondCounselRoutinelyEngaged>1</BondCounselRoutinelyEngaged>
        <PostIssuanceComplianceProcdrs>1</PostIssuanceComplianceProcdrs>
      </Form990ScheduleKPartIII>
      <Form990ScheduleKPartIV>
        <Form8038TFiled>0</Form8038TFiled>
        <VariableRateIssue>1</VariableRateIssue>
        <HedgeIdentifiedInBooksAndRecds>0</HedgeIdentifiedInBooksAndRecds>
        <GrossProceedsInvestedInGIC>1</GrossProceedsInvestedInGIC>
        <NameOfGICProvider>
          <BusinessNameLine1>CITIGROUP GLOBAL</BusinessNameLine1>
          <BusinessNameLine2>MARKETS</BusinessNameLine2>
        </NameOfGICProvider>
        <TermOfGIC>1.500000000000</TermOfGIC>
        <RegulatorySafeHarborSatisfied>1</RegulatorySafeHarborSatisfied>
        <GrossProceedsInvested>0</GrossProceedsInvested>
        <ExceptionToRebate>0</ExceptionToRebate>
      </Form990ScheduleKPartIV>
    </IRS990ScheduleK>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>James Dickerson</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Bank of America Director</Relationship>
        <AmountOfTransaction>422845</AmountOfTransaction>
        <DescriptionOfTransaction>Int Exp</DescriptionOfTransaction>
        <SharingOfRevenues>0</SharingOfRevenues>
      </Form990ScheduleLPartIV>
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>Darrell Jackson</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Northern Trust Exec</Relationship>
        <AmountOfTransaction>119088</AmountOfTransaction>
        <DescriptionOfTransaction>Inv Mgmt</DescriptionOfTransaction>
        <SharingOfRevenues>0</SharingOfRevenues>
      </Form990ScheduleLPartIV>
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>William Ritchie</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>Partner Jones Day</Relationship>
        <AmountOfTransaction>143011</AmountOfTransaction>
        <DescriptionOfTransaction>Legal</DescriptionOfTransaction>
        <SharingOfRevenues>0</SharingOfRevenues>
      </Form990ScheduleLPartIV>
    </IRS990ScheduleL>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTraded>
        <NonCashCheckbox>X</NonCashCheckbox>
        <NumberOfContributions>16</NumberOfContributions>
        <NoncashContribsRptdF990>184610</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>Fair Market Value</MethodOfDeterminingRevenues>
      </SecuritiesPubliclyTraded>
      <OtherNonCashContributionsTable>
        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Restroom Services</Description>
        <NumberOfContributions>1</NumberOfContributions>
        <NoncashContribsRptdF990>3500</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>Fair Market Value</MethodOfDeterminingRevenues>
      </OtherNonCashContributionsTable>
      <OtherNonCashContributionsTable>
        <NonCashCheckbox>X</NonCashCheckbox>
        <Description>Landscape Matl</Description>
        <NumberOfContributions>1</NumberOfContributions>
        <NoncashContribsRptdF990>28000</NoncashContribsRptdF990>
        <MethodOfDeterminingRevenues>Fair Market Value</MethodOfDeterminingRevenues>
      </OtherNonCashContributionsTable>
      <AnyPropertyThatMustBeHeld>0</AnyPropertyThatMustBeHeld>
      <ReviewProcessUnusualNCGifts>1</ReviewProcessUnusualNCGifts>
      <ThirdPartiesUsed>0</ThirdPartiesUsed>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <Identifier>Form 990, Part VI, Section B, line 11</Identifier>
        <Explanation>Form 990 is prepared by the Arboretum's accountants, reviewed by the Audit Committee and distributed to the Board of Trustees prior to filing.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section B, line 12c</ReturnReference>
        <Explanation>The Morton Arboretum requires that all trustees, employees, and volunteers disclose and declare any personal, familial, or business relationships, situations, or activities that have the potential to create a conflict of interest or the perception of a conflict of interest. For trustees and employees, the declaration must be renewed annually or when applicable changes in status occur. The Arboretum supplies a Conflict of Interest Declaration form to all trustees and employees for this purpose. Volunteers are informed of this policy at the onset of their service, in the published volunteer handbook, and in periodic communications. For all trustees, employees, and volunteers, relationships or situations that arise that may create or appear to create a conflict of interest must be brought to the attention of the President or the Chairman of the Board of Trustees.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section B, line 15</ReturnReference>
        <Explanation>The process for determining compensation of officers and key employees includes a market analysis of comparable positions from peer gardens and other similar organizations for bench marking purposes. This information is reviewed by internal Human Resources professionals and the compensation committee of the Board of Trustees. The full Board reviews and approves recommendations of compensation matters for the President and CEO. The compensation of other officers and key employees is approved by the compensation committee of the Board.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section C, line 19</ReturnReference>
        <Explanation>Financial statements are available to the public on our website (www.mortonarb.org) and in our Annual Report. Governing documents and Conflict of Interest Policy are available upon request.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>Changes in Net Assets or Fund Balances:</Identifier>
        <ReturnReference>Form 990, Part XI, line 5:</ReturnReference>
        <Explanation>Net unrealized gains on investments: 25,374,609.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part XII, line 2c:</ReturnReference>
        <Explanation>This process has not changed from the prior year.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>SCHEDULE K. PART I. LINE A. COLUMN F</ReturnReference>
        <Explanation>The proceeds of the bonds were used for the costs of certain capital improvements to the facilities of the borrower located in Lisle, Illinois, including (a) the construction of a Visitor Center and Tram Road; (b) visitor facilities and a Prairie Visitor Station, (c) the expansion and improvement of the main entrance to The Morton Arboretum, (d) the restoration of the riverbank, (e) the construction of parking lots and support facilities, (f) the construction of a children's garden, maze garden, Arbor Court and Meadow Lake courtyard facilities and (g) landscaping, storm water facility and related improvements, (ii) pay a portion of the interest to accrue on the bonds and (iii) pay a portion of certain expenses incurred in connection with the issuance of the bonds.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>SCHEDULE K. PART IV. LINE 1</ReturnReference>
        <Explanation>No; there was no arbitrage rebate or penalty due. The net rebate liability was negative.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>