Liabilities / Assets
5th percentile
Tied with the lowest-debt nonprofits in its peer group.
EIN 87-3060445 • 501(c)3 • Boston, MA
Profile
To operate exclusively for educational, charitable and scientific purposes within the meaning of section 501(c)(3) of the internal revenue code as a section 509(a)(3) supporting organization of the boston foundation.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
5th percentile
Tied with the lowest-debt nonprofits in its peer group.
Liabilities / Revenue
6th percentile
Tied with the lowest-debt nonprofits in its peer group.
Net Margin
98th percentile
Higher net margin than 98% of similar nonprofits.
Top Officer Pay
18th percentile
Higher top officer pay than 18% of similar nonprofits.
Top officer pay equals 0.0% of source-year revenue.
Asset Growth
Score unavailable
No earlier valid filing was available within the previous three public years.
Revenue Growth
Score unavailable
No earlier valid filing was available within the previous three public years.
Assets
Up$44,770,130
Up $2,272,601 (+5.3%) from 2023
Liabilities
Up$200,000
Up $200,000 from 2023
Net Assets
Up$44,570,130
Up $2,072,601 (+4.9%) from 2023
Revenue
Down$4,989,841
Down $14,082,672 (-74%) from 2023
Expenses
Up$2,444,857
Up $2,050,991 (+521%) from 2023
Net Income
Down$2,544,984
Down $16,133,663 (-86%) from 2023
Most recent year
2024 • Form 990Detailed filing. Detailed filing data is available for this year.
| Balance Sheet | Operations | |||||
|---|---|---|---|---|---|---|
| Year | Assets | Liabilities | Net Assets | Revenue | Expenses | Net Income |
| 2024Detailed filing. Detailed filing data is available for this year. | $44.8 | $0.20 | $44.6 | $4.99 | $2.44 | $2.54 |
| 2023Detailed filing. Detailed filing data is available for this year. | $42.5 | $0.00 | $42.5 | $19.1 | $0.39 | $18.7 |
| 2022Detailed filing. Detailed filing data is available for this year. | $13.9 | $0.00 | $13.9 | $14.0 | $0.37 | $13.7 |
To operate exclusively for educational, charitable and scientific purposes within the meaning of section 501(c)(3) of the internal revenue code as a section 509(a)(3) supporting organization of the boston foundation.
A section 509(a)(3) supporting organization of the boston foundation.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments Other Securities | $29,691,117 | $34,951,580 | ▲ $5,260,463 |
| Investments in Publicly Traded Securities | $8,374,240 | $5,932,770 | ▼ $2,441,470 |
| Cash and Non-Interest-Bearing Accounts | $4,429,062 | $3,880,578 | ▼ $548,484 |
| Accounts Receivable | $3,110 | $5,202 | ▲ $2,092 |
| Total Assets | $42,497,529 | $44,770,130 | ▲ $2,272,601 |
| Liabilities | |||
| Grants Payable | - | $200,000 | - |
| Total Liabilities | $0 | $200,000 | ▲ $200,000 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $42,497,529 | $44,570,130 | ▲ $2,072,601 |
| Total Net Assets Fund Balance | $42,497,529 | $44,570,130 | ▲ $2,072,601 |
| Total Liabilities and Net Assets / Fund Balance | $42,497,529 | $44,770,130 | ▲ $2,272,601 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Other Securities | $34,951,580 | - | - |
| Name | Title |
|---|---|
| William N Thorndike Jr | President, Treasurer & CIO |
| Charles Cheever | Director |
| M Lee Pelton | Director |
| Thomas Bird | Director |
| Geneva S Thorndike | Clerk |
| Line Item | Amount |
|---|---|
| Grants and Similar Amounts Paid | $2,383,667 |
| Other Expenses | $61,190 |
| Professional Fundraising Fees | $0 |
| Salaries, Compensation, and Employee Benefits | $0 |
| Total Fundraising Expense | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Grants to Domestic Orgs | $2,383,667 | - | - | $2,383,667 |
| Fees for Services Other | - | $47,494 | - | $47,494 |
| Fees for Services Accounting | - | $13,696 | - | $13,696 |
| Total Functional Expenses | $2,383,667 | $61,190 | $0 | $2,444,857 |
| Recipient | Location | Category | Purpose | Amount |
|---|---|---|---|---|
| College of the Atlantic | Bar Harbor, ME | 501(c)(3) | General Support | $1,176,000 |
| Boston Foundation Inc | Boston, MA | 501(c)(3) | General Support | $355,000 |
| Jessup Memorial Library | Bar Harbor, ME | 501(c)(3) | General Support | $275,000 |
| Vital Cxns Inc | West Roxbury, MA | 501(c)(3) | General Support | $176,667 |
| AUTHOR'S GUILD FOUNDATION | New York City, NY | 501(c)(3) | General Support | $100,000 |
| Massachusetts General Hospital | Boston, MA | 501(c)(3) | Special Project | $100,000 |
| CHILDREN'S TUMOR FOUNDATION | New York City, NY | 501(c)(3) | General Support | $25,000 |
| Mount Desert Land and Garden Preserve | Seal Harbor, ME | 501(c)(3) | General Support | $25,000 |
| North Bennet Street School | Boston, MA | 501(c)(3) | General Support | $25,000 |
| Society for the Preservation of New England Antiquities | Boston, MA | 501(c)(3) | General Support | $25,000 |
| Wgbh Educational Foundation | Boston, MA | 501(c)(3) | General Support | $25,000 |
| Friends of Acadia | Bar Harbor, ME | 501(c)(3) | General Support | $15,000 |
| Healthy Acadia | Ellsworth, ME | 501(c)(3) | Special Project | $10,000 |
| Kids Alive International | Alpharetta, GA | 501(c)(3) | Special Project | $10,000 |
| Miraclefeet | Chapel Hill, NC | 501(c)(3) | General Support | $10,000 |
| Museum of Fine Arts | Boston, MA | 501(c)(3) | General Support | $6,000 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
“William n. Thorndike jr. And geneva s. Thorndike are married.”
“The federal form 990 and the massachusetts form pc are completed by the accounting firm, and completed returns are of the returns are distributed to all voting members of the board of directors for their review and comment in advance of the returns being filed.”
“Documents required by law are made available to the public upon request.”
“The foundation is a supporting organization exempt from income taxes in accordance with sections 501(c)(3) and 509(a)(3) of the internal revenue code (irc). Management believes that the foundation operates in a manner consistent with its tax-exempt status at both the federal and state levels. The foundation annually files irs form 990, return of organization exempt from income tax, reporting various information that the irs uses to monitor the activities of tax-exempt entities. These tax returns are subject to review by the taxing authorities, generally for a period of three years after they were filed. The foundation currently has no tax examinations in progress.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | 1 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 3110 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 5202 |
| IRS990/AcctCompileOrReviewBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/ActivitiesConductedPrtshpInd | 0 | 0 |
| IRS990/ActivityOrMissionDesc | 0 | A SECTION 509(A)(3) SUPPORTING ORGANIZATION OF THE BOSTON FOUNDATION. |
| IRS990/AllOtherContributionsAmt | 0 | 4834125 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | 1 |
| IRS990/AuditCommitteeInd | 0 | 0 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | CHOATE HALL & STEWART |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6172485000 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | TWO INTERNATIONAL PLACE SUITE 3000 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | BOSTON |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02110 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | 0 |
| IRS990/BusinessRlnWithFamMemInd | 0 | 0 |
| IRS990/BusinessRlnWithOrgMemInd | 0 | 0 |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 4429062 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 3880578 |
| IRS990/ChangeToOrgDocumentsInd | 0 | 0 |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/CollectionsOfArtInd | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | 0 |
| IRS990/CompensationProcessCEOInd | 0 | 0 |
| IRS990/CompensationProcessOtherInd | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | 1 |
| IRS990/ConservationEasementsInd | 0 | 0 |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | 0 |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 4834125 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 2383667 |
| IRS990/CYInvestmentIncomeAmt | 0 | 473958 |
| IRS990/CYOtherExpensesAmt | 0 | 61190 |
| IRS990/CYOtherRevenueAmt | 0 | -318242 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 2544984 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/CYTotalExpensesAmt | 0 | 2444857 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 4989841 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | 0 |
| IRS990/DeductibleArtContributionInd | 0 | 0 |
| IRS990/DeductibleNonCashContriInd | 0 | 0 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | 0 |
| IRS990/Desc | 0 | AWARDED GRANTS FOR CHARITABLE PURPOSES. |
| IRS990/DescribedInSection501c3Ind | 0 | 1 |
| IRS990/DisregardedEntityInd | 0 | 0 |
| IRS990/DocumentRetentionPolicyInd | 0 | 0 |
| IRS990/DonorAdvisedFundInd | 0 | 0 |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | 0 |
| IRS990/ElectionOfBoardMembersInd | 0 | 0 |
| IRS990/EmployeeCnt | 0 | 0 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | 0 |
| IRS990/ExpenseAmt | 0 | 2383667 |
| IRS990/FamilyOrBusinessRlnInd | 0 | 1 |
| IRS990/FederalGrantAuditRequiredInd | 0 | 0 |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 13696 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 13696 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 47494 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 47494 |
| IRS990/ForeignActivitiesInd | 0 | 0 |
| IRS990/ForeignFinancialAccountInd | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | 0 |
| IRS990/Form8282PropertyDisposedOfInd | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.00 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | WILLIAM N THORNDIKE JR |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | GENEVA S THORNDIKE |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | M LEE PELTON |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | THOMAS BIRD |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | CHARLES CHEEVER |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | PRESIDENT, TREASURER & CIO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | CLERK |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | DIRECTOR |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | DIRECTOR |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | 1 |
| IRS990/FormationYr | 0 | 2021 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | 0 |
| IRS990/FSAuditedInd | 0 | 0 |
| IRS990/FundraisingActivitiesInd | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 441351 |
| IRS990/GamingActivitiesInd | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 5 |
| IRS990/GrantAmt | 0 | 2383667 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 200000 |
| IRS990/GrantsToDomesticOrgsGrp/ProgramServicesAmt | 0 | 2383667 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 2383667 |
| IRS990/GrantsToIndividualsInd | 0 | 0 |
| IRS990/GrantsToOrganizationsInd | 0 | 1 |
| IRS990/GrantToRelatedPersonInd | 0 | 0 |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 9064548 |
| IRS990/GrossReceiptsAmt | 0 | 13613038 |
| IRS990/GroupReturnForAffiliatesInd | 0 | 0 |
| IRS990/IncludeFIN48FootnoteInd | 0 | 1 |
| IRS990/IndependentAuditFinclStmtInd | 0 | 0 |
| IRS990/IndependentVotingMemberCnt | 0 | 5 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 0 |
| IRS990/IndoorTanningServicesInd | 0 | 0 |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 32607 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 32607 |
| IRS990/InvestmentInJointVentureInd | 0 | 0 |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 29691117 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 34951580 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 8374240 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 5932770 |
| IRS990/IRPDocumentCnt | 0 | 0 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 8623197 |
| IRS990/LoanOutstandingInd | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | 0 |
| IRS990/LocalChaptersInd | 0 | 0 |
| IRS990/MaterialDiversionOrMisuseInd | 0 | 0 |
| IRS990/MembersOrStockholdersInd | 0 | 0 |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | 1 |
| IRS990/MinutesOfGoverningBodyInd | 0 | 1 |
| IRS990/MissionDesc | 0 | TO OPERATE EXCLUSIVELY FOR EDUCATIONAL, CHARITABLE AND SCIENTIFIC PURPOSES WITHIN THE MEANING OF SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE AS A SECTION 509(A)(3) SUPPORTING ORGANIZATION OF THE BOSTON FOUNDATION. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | 0 |
| IRS990/MoreThan5000KToOrgInd | 0 | 0 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 42497529 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 44570130 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 441351 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 441351 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | -472383 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 42497529 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 44570130 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | 0 |
| IRS990/OfficerMailingAddressInd | 0 | 0 |
| IRS990/OperateHospitalInd | 0 | 0 |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsFASB117Ind | 0 | X |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 900099 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | K-1 PARTNERSHIP FLOWTH |
| IRS990/OtherRevenueMiscGrp/ExclusionAmt | 0 | -318242 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | -318242 |
| IRS990/OtherRevenueTotalAmt | 0 | -318242 |
| IRS990/PartialLiquidationInd | 0 | 0 |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/PoliticalCampaignActyInd | 0 | 0 |
| IRS990/PrincipalOfficerNm | 0 | WILLIAM N THORNDIKE JR |
| IRS990/ProfessionalFundraisingInd | 0 | 0 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | 0 |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 16260061 |
| IRS990/PYExcessBenefitTransInd | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 391667 |
| IRS990/PYInvestmentIncomeAmt | 0 | 2812452 |
| IRS990/PYOtherExpensesAmt | 0 | 2199 |
| IRS990/PYOtherRevenueAmt | 0 | 0 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 18678647 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/PYTotalExpensesAmt | 0 | 393866 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 19072513 |
| IRS990/QuidProQuoContributionsInd | 0 | 0 |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 2544984 |
| IRS990/RegularMonitoringEnfrcInd | 0 | 0 |
| IRS990/RelatedEntityInd | 0 | 1 |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | 1 |
| IRS990/ReportLandBuildingEquipmentInd | 0 | 0 |
| IRS990/ReportOtherAssetsInd | 0 | 0 |
| IRS990/ReportOtherLiabilitiesInd | 0 | 0 |
| IRS990/ReportProgramRelatedInvstInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/Contribution35ControlledInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionControllerInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionFamilyInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ControlledDisqualifiedPrsnInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnControllIntInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnOwnrIntInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ExcessBusinessHoldingsRulesInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ListedByNameGoverningDocInd | 0 | 1 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/LoanDisqualifiedPersonInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/OrganizationChangeSuprtOrgInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/PaymentSubstantialContribtrInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgNotOrganizedUSInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgSectionC456Ind | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportNonSupportedOrgInd | 0 | 0 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SuprtOrgNoIRSDeterminationInd | 0 | 0 |
| IRS990ScheduleA/Form990SchAType1SuprtOrgGrp/OperateBenefitNonSuprtOrgInd | 0 | 0 |
| IRS990ScheduleA/Form990SchAType1SuprtOrgGrp/PowerAppointMajorityDirTrstInd | 0 | 1 |
| IRS990ScheduleA/IRSWrittenDeterminationInd | 0 | X |
| IRS990ScheduleA/OtherSupportSumAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrganizationsCnt | 0 | 1 |
| IRS990ScheduleA/SupportedOrganizationsTotalCnt | 0 | 1 |
| IRS990ScheduleA/SupportedOrgInformationGrp/EIN | 0 | 042104021 |
| IRS990ScheduleA/SupportedOrgInformationGrp/GoverningDocumentListedInd | 0 | 1 |
| IRS990ScheduleA/SupportedOrgInformationGrp/OrganizationTypeCd | 0 | 8 |
| IRS990ScheduleA/SupportedOrgInformationGrp/OtherSupportAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportAmt | 0 | 355000 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportedOrganizationName/BusinessNameLine1Txt | 0 | BOSTON FOUNDATION |
| IRS990ScheduleA/SupportingOrganization509a3Ind | 0 | X |
| IRS990ScheduleA/SupportingOrgType1Ind | 0 | X |
| IRS990ScheduleA/SupportSumAmt | 0 | 355000 |
| IRS990ScheduleB/ContributorInformationGrp/ContributorBusinessName/BusinessNameLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorNum | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine1 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/AddressLine2 | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/City | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/State | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/ContributorUSAddress/ZIPCode | 0 | RESTRICTED |
| IRS990ScheduleB/ContributorInformationGrp/TotalContributionsAmt | 0 | RESTRICTED |
| IRS990/ScheduleBRequiredInd | 0 | 1 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/OtherSecuritiesGrp/BookValueAmt | 0 | 34951580 |
| IRS990ScheduleD/OtherSecuritiesGrp/Desc | 0 | PRIVATE INVESTMENTS |
| IRS990ScheduleD/OtherSecuritiesGrp/MethodValuationCd | 0 | F |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | THE FOUNDATION IS A SUPPORTING ORGANIZATION EXEMPT FROM INCOME TAXES IN ACCORDANCE WITH SECTIONS 501(C)(3) AND 509(A)(3) OF THE INTERNAL REVENUE CODE (IRC). MANAGEMENT BELIEVES THAT THE FOUNDATION OPERATES IN A MANNER CONSISTENT WITH ITS TAX-EXEMPT STATUS AT BOTH THE FEDERAL AND STATE LEVELS. THE FOUNDATION ANNUALLY FILES IRS FORM 990, RETURN OF ORGANIZATION EXEMPT FROM INCOME TAX, REPORTING VARIOUS INFORMATION THAT THE IRS USES TO MONITOR THE ACTIVITIES OF TAX-EXEMPT ENTITIES. THESE TAX RETURNS ARE SUBJECT TO REVIEW BY THE TAXING AUTHORITIES, GENERALLY FOR A PERIOD OF THREE YEARS AFTER THEY WERE FILED. THE FOUNDATION CURRENTLY HAS NO TAX EXAMINATIONS IN PROGRESS. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | PART X, LINE 2: |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 0 |
| IRS990ScheduleD/TotalBookValueSecuritiesAmt | 0 | 34951580 |
| IRS990ScheduleI/GrantRecordsMaintainedInd | 0 | 0 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 0 | 100000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 1 | 25000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 2 | 1176000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 3 | 15000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 4 | 10000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 5 | 275000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 6 | 10000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 7 | 100000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 8 | 10000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 9 | 25000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 10 | 6000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 11 | 25000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 12 | 25000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 13 | 355000 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 14 | 176667 |
| IRS990ScheduleI/RecipientTable/CashGrantAmt | 15 | 25000 |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 0 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 1 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 2 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 3 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 4 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 5 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 6 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 7 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 8 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 9 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 10 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 11 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 12 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 13 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 14 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/IRCSectionDesc | 15 | 501(C)(3) |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 0 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 1 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 2 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 3 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 4 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 5 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 6 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 7 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 8 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 9 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 10 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 11 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 12 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 13 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 14 | 0 |
| IRS990ScheduleI/RecipientTable/NonCashAssistanceAmt | 15 | 0 |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 0 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 1 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 2 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 3 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 4 | SPECIAL PROJECT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 5 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 6 | SPECIAL PROJECT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 7 | SPECIAL PROJECT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 8 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 9 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 10 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 11 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 12 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 13 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 14 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/PurposeOfGrantTxt | 15 | GENERAL SUPPORT |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 0 | AUTHOR'S GUILD FOUNDATION |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 1 | CHILDREN'S TUMOR FOUNDATION |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 2 | COLLEGE OF THE ATLANTIC |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 3 | FRIENDS OF ACADIA |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 4 | HEALTHY ACADIA |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 5 | JESSUP MEMORIAL LIBRARY |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 6 | KIDS ALIVE INTERNATIONAL |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 7 | MASSACHUSETTS GENERAL HOSPITAL |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 8 | MIRACLEFEET |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 9 | MOUNT DESERT LAND AND GARDEN PRESERVE |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 10 | MUSEUM OF FINE ARTS |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 11 | NORTH BENNET STREET SCHOOL |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 12 | SOCIETY FOR THE PRESERVATION OF NEW ENGLAND ANTIQUITIES |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 13 | BOSTON FOUNDATION INC |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 14 | VITAL CXNS INC |
| IRS990ScheduleI/RecipientTable/RecipientBusinessName/BusinessNameLine1Txt | 15 | WGBH EDUCATIONAL FOUNDATION |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 0 | 237248599 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 1 | 132298956 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 2 | 237032625 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 3 | 010425071 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 4 | 270548057 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 5 | 010214017 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 6 | 311140515 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 7 | 041564655 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 8 | 273764203 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 9 | 237102758 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 10 | 042103607 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 11 | 042103830 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 12 | 042104937 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 13 | 042104021 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 14 | 301255787 |
| IRS990ScheduleI/RecipientTable/RecipientEIN | 15 | 042104397 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 0 | 31 E 32ND ST SUITE 901 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 1 | 697 THIRD AVENUE SUITE 418 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 2 | 105 EDEN STREET |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 3 | PO BOX 45 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 4 | PO BOX 1710 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 5 | 34 MOUNT DESERT STREET |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 6 | 2555 NORTHWINDS PARKWAY SUITE 1300 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 7 | 55 FRUIT STREET WARREN 719 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 8 | 107 CONNER DRIVE STE 230 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 9 | PO BOX 208 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 10 | 465 HUNTINGTON AVENUE |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 11 | 150 NORTH STREET |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 12 | 141 CAMBRIDGE STREET |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 13 | 75 ARLINGTON STREET 3RD FL |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 14 | PO BOX 320421 |
| IRS990ScheduleI/RecipientTable/USAddress/AddressLine1Txt | 15 | ONE GUEST STREET |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 0 | NEW YORK CITY |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 1 | NEW YORK CITY |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 2 | BAR HARBOR |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 3 | BAR HARBOR |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 4 | ELLSWORTH |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 5 | BAR HARBOR |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 6 | ALPHARETTA |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 7 | BOSTON |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 8 | CHAPEL HILL |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 9 | SEAL HARBOR |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 10 | BOSTON |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 11 | BOSTON |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 12 | BOSTON |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 13 | BOSTON |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 14 | WEST ROXBURY |
| IRS990ScheduleI/RecipientTable/USAddress/CityNm | 15 | BOSTON |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 0 | NY |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 1 | NY |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 2 | ME |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 3 | ME |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 4 | ME |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 5 | ME |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 6 | GA |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 7 | MA |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 8 | NC |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 9 | ME |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 10 | MA |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 11 | MA |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 12 | MA |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 13 | MA |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 14 | MA |
| IRS990ScheduleI/RecipientTable/USAddress/StateAbbreviationCd | 15 | MA |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 0 | 10016 |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 1 | 10017 |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 2 | 04609 |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 3 | 04609 |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 4 | 04605 |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 5 | 04609 |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 6 | 30009 |
| IRS990ScheduleI/RecipientTable/USAddress/ZIPCd | 7 | 02114 |
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