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      <Desc>Tuition and fees - Offer an Early Childhood education program (Pre-Nursery to Pre-K) and K-12 college preparatory curriculum with campuses in East Hampton and Bridgehampton, New York. Ross also has a boarding program for grades 6-12. For the fiscal year 2023, approximately 380 students were enrolled.</Desc>
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        <Desc>The Tennis Center is open to the public after school hours. There are a variety of different programs and services offered - clinics, classes, court rentals, tournaments, mixers, match plays, summer camps and lessons. The Tennis Academy program (RSTA) runs during the week and is a small, intimate program that allows players to develop lasting relationships with coaches while receiving personalized instruction. Athletes who attend RSTA receive high-performance tennis training while following a stimulating college preparatory curriculum with their peers during the school year. Adult classes run in the morning and about 80 adults enroll per session. After school programs range from ages 5-15 and about 110 kids are enrolled in this program. Court rentals are offered on the weekends with about 100 clients regularly booking court rentals. Lessons are offered after school and on the weekends with ages ranging from 3-70. Ross has about 180 clients regularly booking lessons. Junior tournaments and match plays are offered on the weekends for ages 8-18 and about 200 kids normally sign up for tournaments. The summer camp is held from June - August for ages 5-16 with about 300 kids enrolled.</Desc>
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      <ContractorCompensationGrp>
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          <BusinessName>
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        <CurrentTaxYearMinus3YearsAmt>3354616</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>3037657</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>658227</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>3839441</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus1YearAmt>3290</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>14669</CurrentTaxYearAmt>
        <TotalAmt>204859</TotalAmt>
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        <CurrentTaxYearAmt>0</CurrentTaxYearAmt>
        <TotalAmt>0</TotalAmt>
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        <CurrentTaxYearMinus3YearsAmt>72779</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>25576</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>69771</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>50130</CurrentTaxYearAmt>
        <TotalAmt>218256</TotalAmt>
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      <TotalSupportAmt>15427559</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>118921072</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.7157</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.6201</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Schedule A, Part II</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization is a school as described under 170(b)(1)(A)(ii) and is not required to complete a public support schedule. Schedule A, Part II is completed to verify the School can qualify under public charity status section 170(b)(1)(A)(vi) and, therefore, qualifies to use the first listed special rule for Schedule B reporting.</ExplanationTxt>
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      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Schedule A, Part II, Line 10 Other Income</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION - MISC INCOME, COLUMN A - , COLUMN B - 72779.0, COLUMN C - 25576.0, COLUMN D - 69771.0, COLUMN E - 50130.0, COLUMN F - 218256.0;</ExplanationTxt>
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        <EndYearBalanceAmt>446659</EndYearBalanceAmt>
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        <InvestmentEarningsOrLossesAmt>190</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>446361</EndYearBalanceAmt>
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      <BoardDesignatedBalanceEOYPct>0.0</BoardDesignatedBalanceEOYPct>
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        <DepreciationAmt>98393933</DepreciationAmt>
        <BookValueAmt>34142530</BookValueAmt>
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        <BookValueAmt>353537</BookValueAmt>
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      <TotalBookValueLandBuildingsAmt>48061053</TotalBookValueLandBuildingsAmt>
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        <Amt>2819837</Amt>
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      <OtherLiabilitiesOrgGrp>
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      <TotalRevEtcAuditedFinclStmtAmt>25045869</TotalRevEtcAuditedFinclStmtAmt>
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      <RevenueNotReportedAmt>0</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>25045869</RevenueSubtotalAmt>
      <OtherRevenuesNotIncludedAmt>3591324</OtherRevenuesNotIncludedAmt>
      <RevenueNotReportedFinclStmtAmt>3591324</RevenueNotReportedFinclStmtAmt>
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      <ExpensesSubtotalAmt>30527012</ExpensesSubtotalAmt>
      <OtherExpensesNotIncludedAmt>3591324</OtherExpensesNotIncludedAmt>
      <ExpensesNotRptFinclStmtAmt>3591324</ExpensesNotRptFinclStmtAmt>
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        <FormAndLineReferenceDesc>Schedule D, Part V, Line 4 Intended uses of endowment funds</FormAndLineReferenceDesc>
        <ExplanationTxt>Each fiscal year, the Institute is authorized to expend from the Scholarship Fund (endowment) an amount equal to four and one-half percent of the principal of the endowment as of the first business day of such year, or such other amount as shall be mutually agreed upon by the donor or the donor's designated representatives and the Ross School. The endowment payout shall be paid first from the income of the endowment and, if and to the extent that such income is insufficient, from the principal of the endowment. If the income of the endowment in any fiscal year exceeds the authorized payout amount for such year, the excess will be added to principal at the end of such fiscal year. The endowment payout for each fiscal year shall be used to award scholarships to help support the tuition of one or more students at the Institute entering the ninth grade who have exhibited a deep interest in or enjoyment of the arts and/or sciences, especially the environmental sciences, and who are eligible on a needs basis for financial aid at the Institute.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part XI, Line 4(b) Other revenues in form 990 not in audited financial statements</FormAndLineReferenceDesc>
        <ExplanationTxt>Scholarships and financial aid - 3591324</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part XII, Line 4(b) Other expenses in form 990 not in audited financial statements</FormAndLineReferenceDesc>
        <ExplanationTxt>Scholarships and financial aid - 3591324</ExplanationTxt>
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      <PolicyStmtInBrochuresEtcInd>true</PolicyStmtInBrochuresEtcInd>
      <PlcyPblczdViaBroadcastMediaInd>true</PlcyPblczdViaBroadcastMediaInd>
      <MaintainRacialCompRecsInd>true</MaintainRacialCompRecsInd>
      <MaintainScholarshipsRecsInd>true</MaintainScholarshipsRecsInd>
      <MaintainCpyOfBrochuresEtcInd>true</MaintainCpyOfBrochuresEtcInd>
      <MaintainCpyOfAllSolInd>true</MaintainCpyOfAllSolInd>
      <DiscriminateRaceStdntsRghtsInd>false</DiscriminateRaceStdntsRghtsInd>
      <DiscriminateRaceAdmissPlcyInd>false</DiscriminateRaceAdmissPlcyInd>
      <DiscriminateRaceEmplmFcultyInd>false</DiscriminateRaceEmplmFcultyInd>
      <DiscriminateRaceSchsInd>false</DiscriminateRaceSchsInd>
      <DiscriminateRaceEducPlcyInd>false</DiscriminateRaceEducPlcyInd>
      <DiscriminateRaceUseOfFcltsInd>false</DiscriminateRaceUseOfFcltsInd>
      <DiscriminateRaceAthltProgInd>false</DiscriminateRaceAthltProgInd>
      <DiscriminateRaceOtherActyInd>false</DiscriminateRaceOtherActyInd>
      <GovernmentFinancialAidRcvdInd>false</GovernmentFinancialAidRcvdInd>
      <GovernmentFinancialAidRvkdInd>false</GovernmentFinancialAidRvkdInd>
      <ComplianceWithRevProc7550Ind>true</ComplianceWithRevProc7550Ind>
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        <FormAndLineReferenceDesc>Schedule E, Part I, Line 3 RACIALLY NONDISCRIMINATORY POLICY</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization publicized its racially nondiscriminatory policy on the homepage of its website at all times during its tax year in a manner reasonably expected to be noticed by visitors.</ExplanationTxt>
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        <RegionTxt>South Asia</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>Program Services</TypeOfActivitiesConductedTxt>
        <SpecificServicesProvidedTxt>Field trips</SpecificServicesProvidedTxt>
        <RegionTotalExpendituresAmt>281983</RegionTotalExpendituresAmt>
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      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>Sub-Saharan Africa</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>Program Services</TypeOfActivitiesConductedTxt>
        <SpecificServicesProvidedTxt>Field trips</SpecificServicesProvidedTxt>
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      <AccountActivitiesOutsideUSGrp>
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        <TypeOfActivitiesConductedTxt>Program Services</TypeOfActivitiesConductedTxt>
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      <TransferToForeignCorpInd>false</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>false</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>false</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>false</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>false</ForeignPartnershipInd>
      <BoycottCountriesInd>false</BoycottCountriesInd>
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        <FormAndLineReferenceDesc>Schedule F, Part I, Line 3 Method used to account for expenditures on org's financial statements</FormAndLineReferenceDesc>
        <ExplanationTxt>EAST ASIA AND THE PACIFIC-Accrual; SOUTH ASIA-Accrual; SUB-SAHARAN AFRICA-Accrual</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule I, Part I, Line 2 Procedures for monitoring use of grant funds.</FormAndLineReferenceDesc>
        <ExplanationTxt>The assistance provided by the Institute is in the form of academic scholarships to attend the Ross School and financial assistance to attend the summer camp program conducted by the Institute. Records are maintained documenting the participants who receive aid and the rationale for providing aid to each participant. No cash changes hands and funds are directly tied to student accounts.</ExplanationTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
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          <BusinessNameLine1Txt>Thomas Sturtevant</BusinessNameLine1Txt>
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        <TotalCompensationFilingOrgAmt>410068</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a Housing allowance or residence for personal use</FormAndLineReferenceDesc>
        <ExplanationTxt>Housing Allowance: As a condition of employment, and as a convenience to the Institute, the Head of School and Head of School &amp; Head of High School are provided a home near Ross Institute. The home is provided as a nontaxable benefit to the Head of School and the Head of School &amp; Head of High School.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4a Severance or change-of-control payment</FormAndLineReferenceDesc>
        <ExplanationTxt>Charles Abelmann, Former Head of School, received a severance payment of $152,991 during the 2022 calendar year.</ExplanationTxt>
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          <BusinessNameLine1Txt>Courtney S Ross</BusinessNameLine1Txt>
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        <RelationshipWithOrgTxt>Founder / Sub. Contributor / Family member - N. Eloff, Pres. &amp; R. Eloff.</RelationshipWithOrgTxt>
        <LoanPurposeTxt>Operating line of credit</LoanPurposeTxt>
        <LoanToOrganizationInd>X</LoanToOrganizationInd>
        <OriginalPrincipalAmt>18206070</OriginalPrincipalAmt>
        <BalanceDueAmt>186441</BalanceDueAmt>
        <DefaultInd>false</DefaultInd>
        <BoardOrCommitteeApprovalInd>true</BoardOrCommitteeApprovalInd>
        <WrittenAgreementInd>true</WrittenAgreementInd>
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      <LoansBtwnOrgInterestedPrsnGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Courtney S Ross</BusinessNameLine1Txt>
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        <RelationshipWithOrgTxt>Founder / Sub. Contributor / Family member - N. Eloff, Pres. &amp; R. Eloff.</RelationshipWithOrgTxt>
        <LoanPurposeTxt>Receivable for costs incurred by Institute</LoanPurposeTxt>
        <LoanFromOrganizationInd>X</LoanFromOrganizationInd>
        <OriginalPrincipalAmt>23557</OriginalPrincipalAmt>
        <BalanceDueAmt>72127</BalanceDueAmt>
        <DefaultInd>false</DefaultInd>
        <BoardOrCommitteeApprovalInd>true</BoardOrCommitteeApprovalInd>
        <WrittenAgreementInd>false</WrittenAgreementInd>
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      <LoansBtwnOrgInterestedPrsnGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Courtney S Ross</BusinessNameLine1Txt>
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        <RelationshipWithOrgTxt>Founder / Sub. Contributor / Family member - N. Eloff, Pres. &amp; R. Eloff.</RelationshipWithOrgTxt>
        <LoanPurposeTxt>Promissory Note for paying BOA loan down on behalf of the Institute</LoanPurposeTxt>
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        <OriginalPrincipalAmt>3760460</OriginalPrincipalAmt>
        <BalanceDueAmt>8844385</BalanceDueAmt>
        <DefaultInd>false</DefaultInd>
        <BoardOrCommitteeApprovalInd>true</BoardOrCommitteeApprovalInd>
        <WrittenAgreementInd>true</WrittenAgreementInd>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d Description of other program services</FormAndLineReferenceDesc>
        <ExplanationTxt>(Expenses $ including grants of $)(Revenue $ 389,137) Other school programs - Auxiliary programs and income, including TECH program, housing for summer teachers, yearbook income and other various school programs and support activities.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part V, Line 2a</FormAndLineReferenceDesc>
        <ExplanationTxt>Ross Institute does not file any W-2s as all employees are outsourced from a professional employment organization (PEO). The number reported on this line represents the number of employees the filing organizations leased from the PEO. Ross Institute reimburses the professional employment organization for the employees' compensation and the reimbursements are reported on 990 Part VII, Section A and 990 Part IX, Lines 5 - 10.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>The organization does not compensate the top management official. Therefore, this line was answered no in accordance with the instructions</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 1a Delegate broad authority to a committee</FormAndLineReferenceDesc>
        <ExplanationTxt>The Board of Trustees may, by resolution, designate five or more trustees (one of whom shall be the Chairperson of the Board of Trustees) to constitute an Executive Committee, and delegate to the Executive Committee any of the powers and authority of the Board of Trustees in the management of the business and affairs of the Corporation, except for: the amendment or repeal of Bylaws or the adoption of new Bylaws; the amendment or repeal of any resolution of the Board of Trustees that by its express terms is not so amendable or repealable; the filling of vacancies in the Board of Trustees or in any committee; the approval of any transaction in which a trustee or officer has an interest; and the granting of degrees or making removals from office.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 2 Family/business relationships amongst interested persons</FormAndLineReferenceDesc>
        <ExplanationTxt>Nicole Ross Eloff, President and Robert Eloff, Treasurer, Trustee - Family relationship</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 is prepared by an independent CPA firm. A preliminary draft of the organization's Form 990, including all required schedules, was provided to management. Management reviewed the draft Form 990 in detail, consulted with the organization's accountants and tax return preparers, and took all other measures necessary and appropriate to ensure that the final version of the Form 990 is complete and accurate to the best of their knowledge. A copy of the final version of the Form 990, including all required schedules, was provided to each member of the organization's Board of Trustees prior to filing with the IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>Each director, principal officer, key employee, and member of a committee with governing board delegated powers signs a conflict of interest statement annually which is reviewed by the officers. Should any potential conflicts of interest be disclosed, the interested party would be asked to refrain from participation in any deliberation or decision with regard to matters affected by the relationship.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b Process to establish compensation of other employees</FormAndLineReferenceDesc>
        <ExplanationTxt>The Compensation Committee approves the officers and key employees compensation by performing an analysis and utilizing appropriate data as to the comparability of the compensation. The approval process was documented in the minutes.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>The School makes its governing documents, conflict of interest policy, and financial statements available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VIII, Line 11d Other Miscellaneous Revenue</FormAndLineReferenceDesc>
        <ExplanationTxt>Misc Income - Total Revenue: 50130, Related or Exempt Function Revenue: 50130, Unrelated Business Revenue: , Revenue Excluded from Tax Under Sections 512, 513, or 514: ;</ExplanationTxt>
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>RSIL26 LLC</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>18 Goodfriend Drive</AddressLine1Txt>
          <CityNm>East Hampton</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>11937</ZIPCd>
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        <PrimaryActivitiesTxt>Real estate management</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <TotalIncomeAmt>0</TotalIncomeAmt>
        <EndOfYearAssetsAmt>0</EndOfYearAssetsAmt>
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          <BusinessNameLine1Txt>Ross Institute</BusinessNameLine1Txt>
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      <IdDisregardedEntitiesGrp>
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          <BusinessNameLine1Txt>Ross Digital Delivery LLC</BusinessNameLine1Txt>
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          <AddressLine1Txt>18 Goodfriend Drive</AddressLine1Txt>
          <CityNm>East Hampton</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>11938</ZIPCd>
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        <PrimaryActivitiesTxt>Digital delivery of curriculum</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>NY</LegalDomicileStateCd>
        <TotalIncomeAmt>0</TotalIncomeAmt>
        <EndOfYearAssetsAmt>0</EndOfYearAssetsAmt>
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          <BusinessNameLine1Txt>Ross Institute</BusinessNameLine1Txt>
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