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        <PersonNm>GILMAN S BURKE</PersonNm>
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        <PersonNm>JOHN CAHILL</PersonNm>
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        <PersonNm>STEPHEN J CLEARMAN</PersonNm>
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        <PersonNm>JENNIFER CUNNINGHAM</PersonNm>
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        <PersonNm>LEA PAINE HIGHET</PersonNm>
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        <PersonNm>PAUL J ELSTON</PersonNm>
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        <PersonNm>JOHN ERNST</PersonNm>
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        <PersonNm>JOSHUA GINSBERG</PersonNm>
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        <PersonNm>HOLLY HEGENER</PersonNm>
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        <PersonNm>SAMUEL G HUBER</PersonNm>
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        <PersonNm>SAMUEL W LAMBERT III</PersonNm>
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        <PersonNm>YUKI MOORE LAURENTI</PersonNm>
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        <PersonNm>W BARNABAS MCHENRY</PersonNm>
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        <PersonNm>KATHERINE O ROBERTS</PersonNm>
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        <PersonNm>ELIZABETH SMITH</PersonNm>
        <TitleTxt>BOARD MEMBER (LEFT 12/15/17)</TitleTxt>
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        <PersonNm>PATRICIA F SULLIVAN</PersonNm>
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        <PersonNm>THOMAS WRIGHT</PersonNm>
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        <PersonNm>CHRISTOPHER ELLIMAN</PersonNm>
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        <PersonNm>PETER HOWELL</PersonNm>
        <TitleTxt>EXECUTIVE VP, CONSERVATION</TitleTxt>
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        <PersonNm>ROBERT K ANDERBERG</PersonNm>
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        <PersonNm>JOSEPH HOLLAND</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SAMAYLA DEUTCH</PersonNm>
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        <PersonNm>TALLY BLUMBERG</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ERIK KULLESEID</PersonNm>
        <TitleTxt>SVP, NYS PARKS</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>TERRENCE NOLAN</PersonNm>
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        <PersonNm>JENNIFER MELVILLE</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NATE BERRY</PersonNm>
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        <PersonNm>RACHEL PIVNICK</PersonNm>
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        <PersonNm>JEFFREY LEJAVA</PersonNm>
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        <PersonNm>LORIJEANE MOODY</PersonNm>
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        <PersonNm>REBEKAH GERARD</PersonNm>
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        <PersonNm>LESLIE KANE SZYNAL</PersonNm>
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        <PersonNm>EILEEN LARABEE</PersonNm>
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      <InformationTechnologyGrp>
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        <CurrentTaxYearMinus1YearAmt>828870</CurrentTaxYearMinus1YearAmt>
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        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>MISCELLANEOUS - 2013 AMOUNT: $ 26,881. 2014 AMOUNT: $ 46,126. SALES REVENUE - 2013 AMOUNT: $ 32,201. 2014 AMOUNT: $ 35,686. LOAN LOSS RECOVERY - OTHER - 2014 AMOUNT: $ 671. SPECIAL EVENTS - 2013 AMOUNT: $ 32,200. 2014 AMOUNT: $ 28,700. 2015 AMOUNT: $ 21,400. 2016 AMOUNT: $ 23,900. 2017 AMOUNT: $ 31,200.</ExplanationTxt>
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        <AffiliatedGroupTotalAmt>0</AffiliatedGroupTotalAmt>
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        <AffiliatedGroupTotalAmt>0</AffiliatedGroupTotalAmt>
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        <CurrentYearMinus1Amt>1000000</CurrentYearMinus1Amt>
        <CurrentYearAmt>1000000</CurrentYearAmt>
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        <EndYearBalanceAmt>151613634</EndYearBalanceAmt>
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        <EndYearBalanceAmt>161209214</EndYearBalanceAmt>
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        <EndYearBalanceAmt>164204032</EndYearBalanceAmt>
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      <EndowmentsHeldRelatedOrgInd>1</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>1</RelatedOrgListSchRInd>
      <LeaseholdImprovementsGrp>
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        <Amt>404250</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>SECURITY DEPOSITS PAYABLE</Desc>
        <Amt>4025</Amt>
      </OtherLiabilitiesOrgGrp>
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      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE WALLACE ENDOWMENT IS HELD BY OPEN SPACE INSTITUTE LAND TRUST, INC., A SUPPORTING ORGANIZATION OF OSI. THE ENDOWMENT IS USED PRIMARILY FOR THE PURPOSE OF ACQUIRING AND/OR HOLDING LAND IN THE HUDSON RIVER VALLEY, CATSKILLS AND ADIRONDACKS IN ORDER TO PRESERVE AND PROTECT SUCH LAND FOR THE BENEFIT OF THE PUBLIC, AND SECONDARILY FOR OTHER PURPOSES THAT ARE IN FURTHERANCE OF THE CONSERVATION OF THE SCENIC BEAUTY, HISTORIC VALUES AND RESOURCES OF THE REGIONS. THE MALCOLM GORDON CHARITABLE ENDOWMENT FUNDS ARE CLASSIFIED AS TEMPORARILY RESTRICTED BECAUSE THE GRANTOR REQUIRED THAT THE FUNDS BE DEVOTED TO ENVIRONMENTAL EDUCATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION BELIEVES IT HAD NO UNCERTAIN TAX POSITIONS AS OF DECEMBER 31, 2017 AND 2016 IN ACCORDANCE WITH ACCOUNTING STANDARDS CODIFICATION ("ASC") TOPIC 740, "INCOME TAXES," WHICH PROVIDES STANDARDS FOR ESTABLISHING AND CLASSIFYING ANY TAX PROVISIONS FOR UNCERTAIN TAX POSITIONS.</ExplanationTxt>
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    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>CITIZEN CLIMATE COST PROJECT LTD HARVARD BUSINESS SERVICES INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>16192 COASTA HIGHWAY</AddressLine1Txt>
          <CityNm>LEWES</CityNm>
          <StateAbbreviationCd>DE</StateAbbreviationCd>
          <ZIPCd>19958</ZIPCd>
        </USAddress>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
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        <PurposeOfGrantTxt>CITIZEN ACTION PROGRAM</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>HARBORLAB</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>53-21 VERNON BLD</AddressLine1Txt>
          <CityNm>LONG ISLAND CITY</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>11101</ZIPCd>
        </USAddress>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
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        <PurposeOfGrantTxt>CITIZEN ACTION PROGRAM</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>GREENWICH VILLAGE SOCIETY FOR HISTORIC PRESERVATION</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <AddressLine1Txt>232 EAST 11TH ST</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10003</ZIPCd>
        </USAddress>
        <RecipientEIN>133042600</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>27874</CashGrantAmt>
        <PurposeOfGrantTxt>CITIZEN ACTION PROGRAM</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>HUDSON VALLEY SEED</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>380 MAIN STREET SUITE 200</AddressLine1Txt>
          <CityNm>BEACON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12508</ZIPCd>
        </USAddress>
        <RecipientEIN>463267308</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>17000</CashGrantAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>LAND TRUST ALLIANCE INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>112 SPRING STREET</AddressLine1Txt>
          <CityNm>SARATOGA SPRINGS</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12866</ZIPCd>
        </USAddress>
        <RecipientEIN>042751357</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>18878</CashGrantAmt>
        <PurposeOfGrantTxt>CONSERVATION LAND SUMMIT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>ESSEX FARM INSTITUTE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 33</AddressLine1Txt>
          <CityNm>ESSEX</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>12936</ZIPCd>
        </USAddress>
        <RecipientEIN>471368012</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>17403</CashGrantAmt>
        <PurposeOfGrantTxt>CITIZEN ACTION PROGRAM</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>LANDMARK WEST</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>45 WEST 67TH ST</AddressLine1Txt>
          <CityNm>NEW YORK</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10023</ZIPCd>
        </USAddress>
        <RecipientEIN>133363655</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>12983</CashGrantAmt>
        <PurposeOfGrantTxt>CITIZEN ACTION PROGRAM</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>GARRISON UNION FREE SCHOOL</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1100 NY-9D</AddressLine1Txt>
          <CityNm>GARRISON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10524</ZIPCd>
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        <RecipientEIN>146001817</RecipientEIN>
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        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>CONSTITUTION MARSH AUDUBON CENTER AND SANCTUARY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO BOX 174</AddressLine1Txt>
          <CityNm>COLD SPRING</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10516</ZIPCd>
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        <RecipientEIN>131624102</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>MANITOGA</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>P O BOX 249</AddressLine1Txt>
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          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10524</ZIPCd>
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        <PurposeOfGrantTxt>MALCOLM GORDON CHARITABLE FUND</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
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          <CityNm>ALBANY</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
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        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>ORANGE COUNTY CITIZENS FOUNDATION</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>P O BOX 525</AddressLine1Txt>
          <CityNm>SUGAR LOAF</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10981</ZIPCd>
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        <RecipientEIN>132751473</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
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        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>BARD COLLEGE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>CAMPUS ROAD</AddressLine1Txt>
          <CityNm>ANNANDALE ON HUDSON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
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        <PurposeOfGrantTxt>MCHENRY HUDSON RIVER VALLEY AWARDS</PurposeOfGrantTxt>
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      <RecipientTable>
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        </RecipientBusinessName>
        <USAddress>
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          <CityNm>ANNANDALE ON HUDSON</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
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        <RecipientEIN>112587776</RecipientEIN>
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      <RecipientTable>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
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        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>SCHEDULE M PART I LINE 9: THE ORGANIZATION RECEIVED A TOTAL OF SEVEN (7) NON-CASH CONTRIBUTIONS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>SAM LAMBERT AND HOLLY HEGENER HAVE A FAMILY RELATIONSHIP. HOLLY HEGENER IS SAM LAMBERT'S STEP DAUGHTER.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>OUR 990 IS PREPARED BY AN OUTSIDE INDEPENDENT ACCOUNTING FIRM. THE DRAFT FORM 990 IS REVIEWED BY THE CONTROLLER, CHIEF FINANCIAL OFFICER &amp; GENERAL COUNSEL. AFTER STAFF REVIEW THE RETURN IT IS THEN REVIEWED BY THE AUDIT COMMITTEE. THE REVIEWED AND CORRECTED 990 FORM IS THEN SENT OUT TO ALL THE BOARD MEMBERS OF THE ORGANIZATION FOR THEIR REVIEW AND COMMENTS. THE RETURN IS FILED ONCE ALL PARTIES HAVE COMPLETED THEIR REVIEW AND REQUIRED EDITS HAVE BEEN MADE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>OPEN SPACE INSTITUTE, INC. HAS A CONFLICT OF INTEREST POLICY WHICH REQUIRES ALL INTERESTED PERSONS TO DISCLOSE CONFLICTS AND POTENTIAL CONFLICTS AS SOON AS THEY ARISE. A CONFLICTED PARTY MAY NOT DISCUSS THE TRANSACTION THAT IS THE BASIS OF SUCH CONFLICT, AND MUST RECUSE HIMSELF OR HERSELF FROM ANY DISCUSSION OR VOTE ON SUCH TRANSACTION. THE PRESIDENT EACH YEAR REPORTS TO THE BOARD OF TRUSTEES ALL CONFLICT TRANSACTIONS AND HOW THEY WERE HANDLED. THE BOARD OF OPEN SPACE INSTITUTE, INC. HAS THE POWER TO TAKE REMEDIAL ACTION IF THE CONFLICT POLICY IS VIOLATED.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS OF DETERMINING COMPETITIVE COMPENSATION FOR TOP MANAGEMENT AND KEY EMPLOYEES INVOLVES OSI'S COMPENSATION COMMITTEE WORKING WITH AN INDEPENDENT COMPENSATION CONSULTANT. THE COMMITTEE PERFORMS AN ANNUAL ASSESSMENT OF THE RESPONSIBILITIES AND PERFORMANCE OF THE CEO/PRESIDENT (OTHER TOP MANAGEMENT AND KEY EMPLOYEES ARE REVIEWED AT LEAST ANNUALLY BY THE CEO/PRESIDENT). THE COMMITTEE ALSO UTILIZES COMPENSATION SURVEYS AND INFORMATION GLEANED FROM FORM 990S OF COMPARABLE ORGANIZATIONS TO DETERMINE APPLICABLE COMPENSATION RATES. ONCE REASONABLE AND COMPETITIVE COMPENSATION RATES ARE ESTABLISHED, THEY ARE APPROVED BY THE COMPENSATION COMMITTEE.</ExplanationTxt>
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        <ExplanationTxt>OPEN SPACE INSTITUTE, INC. MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, WHISTLEBLOWER POLICY, DOCUMENT RETENTION AND DESTRUCTION POLICY AND FINANCIAL STATEMENTS AVAILABLE TO THE GENERAL PUBLIC. THESE DOCUMENTS ARE SENT TO ANYONE WHO CONTACTS THE ORGANIZATION AND REQUESTS SUCH INFORMATION.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION OF THE ORGANIZATION'S AUDIT COMMITTEE: THE AUDIT COMMITTEE OF THE OPEN SPACE INSTITUTE, INC. IS RESPONSIBLE FOR THE OVERSIGHT OF THE PREPARATION, REVIEW AND AUDIT OF OSI'S FINANCIAL STATEMENTS AND SELECTION OF OSI'S INDEPENDENT ACCOUNTANT. THE COMMITTEE MEETS QUARTERLY TO REVIEW COMPLEX TRANSACTIONS AND INTERIM FINANCIAL STATEMENTS TO OBTAIN A BETTER UNDERSTANDING OF THE CURRENT FINANCIAL CONDITION OF THE ORGANIZATION. ON AN ANNUAL BASIS OSI'S AUDIT COMMITTEE REVIEWS THE REPORT TO THE AUDIT COMMITTEE PREPARED BY OSI'S OUTSIDE AUDITORS AND THE CONSOLIDATED FINANCIAL STATEMENTS OF OUR ORGANIZATION. THE AUDIT COMMITTEE PERIODICALLY REVIEWS, NOT LESS THAN EVERY FIVE YEARS, THE NEED TO REPLACE OSI'S INDEPENDENT ACCOUNTANT BASED ON CERTAIN CRITERIA. THE CRITERIA CONSIDERED INCLUDE DETERMINING IF THE INDEPENDENT ACCOUNTANT POSSESSES A HIGH LEVEL OF KNOWLEDGE OF ACCOUNTING STANDARDS AND PRINCIPLES, GENERALLY, AND NOT FOR PROFIT ACCOUNTING KNOWLEDGE, SPECIFICALLY, AND IF THEY CAN COMPLETE THE REQUIRED WORK IN A TIMELY MANNER AT A COMPETITIVE PRICE.</ExplanationTxt>
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