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        <DepreciationAmt>813996</DepreciationAmt>
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        <Desc>Deferred rent</Desc>
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      <TotalLiabilityAmt>452271</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
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      <InvestmentExpensesNotIncld2Amt>14984</InvestmentExpensesNotIncld2Amt>
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        <FormAndLineReferenceDesc>Schedule D, Part X, Line 2 FIN 48 (ASC 740) footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>SIOR has adopted the accounting standard on accounting for uncertainty in income taxes, which addresses the determination of whether tax benefits claimed or expected to be claimed on a tax return should be recorded in the financial statements. Under this policy, SIOR may recognize the tax benefit from an uncertain tax position only if it is more likely than not that the tax position would be sustained on examination by taxing authorities, based on the technical merits of the position. Management has evaluated SIOR's tax positions and has concluded that SIOR has taken no uncertain tax positions that require adjustment to the financial statements to comply with provisions of this guideline. SIOR would be liable for income taxes in the U.S. federal jurisdiction. Generally, SIOR is no longer subject to U.S. federal tax examinations by tax authorities before 2011.</ExplanationTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
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          <BusinessNameLine1Txt>Robert Hammond</BusinessNameLine1Txt>
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        <TitleTxt>Sr. VP of Operations</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>Diana Lee</BusinessNameLine1Txt>
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        <TitleTxt>Manager</TitleTxt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a Travel for companions</FormAndLineReferenceDesc>
        <ExplanationTxt>Spousal travel to the Spring and Fall Conferences is allowed for 6 members of the Executive Comittee if it is determined that their attendance is needed for business purposes. Reimbursements for spousal travel are reported as taxable income to the member as appropriate. Spousal travel (including gross up payments) for the EVP is reported on the EVP's Form W2.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a Tax indemnification and gross-up payments</FormAndLineReferenceDesc>
        <ExplanationTxt>See below.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6 FORM 990, PART VI, SECTION A, LINE 6 - 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>SIOR'S MEMBERS DO NOT POSSESS THE KINDS OF RIGHTS OUTLINED IN PART VI, LINE 6 OF THE 990 INSTRUCTIONS. AS SUCH, THE ORGANIZATION HAS CHECKED "NO" TO THE QUESTIONS ON LINES 6 - 7B.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b FORM 990, PART VI, SECTION B, LINE 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>SIOR USES AN OUTSIDE CONSULTANT TO HELP DETERMINE THE COMPENSATION PACKAGE FOR THE SENIOR VP OF OPERATIONS. THE SIOR EVP MAKES THE FINAL DECISION REGARDING THE FINAL COMPENSATION PACKAGE. ON AN ANNUAL BASIS, THE SENIOR VP OF OPERATIONS HAS A PERFORMANCE EVALUATION WHICH IS USED IN PART TO DETERMINE ANY CHANGES IN PAY (E.G. VARIABLE COMPENSATION AND MERIT INCREASES).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 will be reviewed in detail by the SIOR Executive Vice President, Treasurer and Executive Committee. In addition, the Treasurer will report the results to the Board of Directors (BOD) at the next Board of Directors.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>On an annual basis, the Board of Directors receive a copy of the Conflict of Interest Policy, and are asked to sign an acknowledgement concerning reporting of potential conflicts of interest. Board members are required to disclose any potential conflicts of interest to the Chairman of the Board immediately. Board members must refrain from voting on any such transactions where there is a potential conflict, participating in deliberations concerning it, or using personal influence in any way involving the matter. In addition, officers, directors, and key employees are required to complete a conflict of interest questionnaire annually to determine if there are any required business transactions that need to be reported on the Form 990. The questionnaires are reviewed by the Office of the EVP to determine any potential conflicts of interest.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a Process to establish compensation of top management official</FormAndLineReferenceDesc>
        <ExplanationTxt>SIOR has a Compensation Committee which consists of the President and the two most immediate past Presidents. Comparability data is used by this committee to help determine compensation. The committee determines the base salary, variable compensation, incentive compensation, other cash compensation and other benefits of the EVP and approved the terms of the Employment Agreement and any amendment thereto. Once the Employment Agreement for the Executive Vice President or any amendment thereto, is approved by the Compensation Committee, an Employment Agreement (or such amendment) shall be executed by the President on the behalf of SIOR. The last comparability study was completed in March 2014 and the most recent employment agreement was dated April 2014. Deliberations and decision-making with respect to the EVP's compensation are documented on a timely basis by the Compensation Committee. On an annual basis, the EVP has a performance evaluation which is used in part to determine any changes in pay (e.g. variable compensation, incentive compensation, cost of living and merit increases). The EVP compensation for the 2014 tax year was reviewed and approved in December 2013.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing documents and conflict of interest policies are posted on the SIOR website. Financial statements are available upon request as deemed appropriate by the EVP.</ExplanationTxt>
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          <BusinessNameLine1Txt>SIOR FOUNDATION</BusinessNameLine1Txt>
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          <AddressLine1Txt>1201 NEW YORK AVE NW STE 350</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
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          <ZIPCd>20005</ZIPCd>
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        <PrimaryActivitiesTxt>EDUCATION</PrimaryActivitiesTxt>
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      <GiftGrntCapContriFromOthOrgInd>true</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>false</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>false</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>false</DivRelatedOrganizationInd>
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          <BusinessNameLine1Txt>SIOR Foundation</BusinessNameLine1Txt>
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        <InvolvedAmt>113000</InvolvedAmt>
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