Liabilities / Assets
91st percentile
Higher debt load relative to assets than 91% of similar nonprofits.
EIN 22-1853399 • 501(c)3 • Princeton, NJ
Profile
Organization's mission & charter: mission: princeton montessori society is comprised of princeton montessori school ("pms") and princeton center for teacher education ("pcte"). The society provides montessori education for children from infancy through middle school, trains prospective montessori teachers, and educates parents. Founded in 1968, princeton montessori school is an independent, co-educational day school, dedicated to the highest quality education of children according to the values and principles of the montessori philosophy. Pcte, founded in 1989, is dedicated to quality montessori teacher training. The teachers learn to nurture the child's innate abilities and self-exploration that build skills and a foundation for the future. Parents are supported through educational resources and classes and are encouraged to participate at the school. As a pioneer in the larger educational community, princeton montessori school and princeton center teacher education, provides vision,
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
91st percentile
Higher debt load relative to assets than 91% of similar nonprofits.
Liabilities / Revenue
82nd percentile
Higher debt load relative to revenue than 82% of similar nonprofits.
Net Margin
45th percentile
Higher net margin than 45% of similar nonprofits.
Top Officer Pay
57th percentile
Higher top officer pay than 57% of similar nonprofits.
Top officer pay equals 1.6% of source-year revenue.
Asset Growth
41st percentile
Faster asset growth than 41% of similar nonprofits.
Revenue Growth
31st percentile
Faster revenue growth than 31% of similar nonprofits.
Assets
Up$9,417,872
Up $1,110,755 (+13%) from 2023
Liabilities
Up$9,064,618
Up $134,700 (+1.5%) from 2023
Net Assets
Up$353,254
Up $976,055 (+157%) from 2023
Revenue
Up$9,402,228
Up $175,171 (+1.9%) from 2023
Expenses
Up$9,217,686
Up $105,576 (+1.2%) from 2023
Net Income
Up$184,542
Up $69,595 (+61%) from 2023
Most recent year
2025 • Form 990XML pending. An XML filing is linked for this year, but detailed extraction is still pending.
The latest 2025 filing currently has linked XML that has not been fully parsed yet. Showing the latest detailed filing from 2017 below.
Organizations Mission (Page 1, Part I, Line 1 & Page 2, Part III, Line 1): Princeton Montessori Society is dedicated to developing passion and nurturing potential in each child, through the values and principles of the Montessori philosophy.
See Schedule O
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Land, Buildings, and Equipment, Net | $7,249,867 | $6,899,234 | ▼ $350,633 |
| Cash and Non-Interest-Bearing Accounts | $1,623,880 | $1,755,699 | ▲ $131,819 |
| Prepaid Expenses and Deferred Charges | $385,915 | $367,598 | ▼ $18,317 |
| Accounts Receivable | $82,283 | $128,331 | ▲ $46,048 |
| Savings and Temporary Cash Investments | $108,394 | $113,520 | ▲ $5,126 |
| Investments in Publicly Traded Securities | $59,369 | $62,013 | ▲ $2,644 |
| Pledges and Grants Receivable | - | $10,000 | - |
| Total Assets | $9,517,803 | $9,372,990 | ▼ $144,813 |
| Other Assets Total | $8,095 | $36,595 | ▲ $28,500 |
| Liabilities | |||
| Tax Exempt Bond Liabilities | $6,978,500 | $6,763,875 | ▼ $214,625 |
| Deferred Revenue | $2,662,785 | $2,878,343 | ▲ $215,558 |
| Other Liabilities | $1,345,299 | $952,014 | ▼ $393,285 |
| Accounts Payable and Accrued Expenses | $56,696 | $150,057 | ▲ $93,361 |
| Mortgage Notes Payable Secured by Investment Property | $77,625 | $78,750 | ▲ $1,125 |
| Total Liabilities | $11,120,905 | $10,823,039 | ▼ $297,866 |
| Net Assets / Fund Balance | |||
| Unrestricted Net Assets | $-1,603,102 | $-1,450,049 | ▲ $153,053 |
| Total Net Assets Fund Balance | $-1,603,102 | $-1,450,049 | ▲ $153,053 |
| Total Liabilities and Net Assets / Fund Balance | $9,517,803 | $9,372,990 | ▼ $144,813 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Buildings | $6,213,830 | $7,007,971 | $13,221,801 |
| Equipment | $239,623 | $567,846 | $807,469 |
| Land | $445,781 | - | $445,781 |
| Other Assets Org | $8,095 | - | - |
| Name | Title | Full / Part Time | Base | Total |
|---|---|---|---|---|
| Michelle Morrison | Executive Director | FT | $131,250 | $131,250 |
| Dale Santos | Director of Finance | FT | $56,446 | $56,446 |
| Name | Title |
|---|---|
| Jennifer Ni | Board of Director |
| Joe Hargrove | Board of Director |
| Lee Gardner | Board of Director |
| Maeve Egner | Board of Director |
| Peter Egbert | Board of Director |
| Rita Zetterberg | Board of Director |
| Sunanda Nair-Bidkar | Board of Director |
| Ugur Koyluoglu | Board of Director |
| Line Item | Amount |
|---|---|
| Salaries, Compensation, and Employee Benefits | $3,886,263 |
| Other Expenses | $1,993,014 |
| Grants and Similar Amounts Paid | $1,438,300 |
| Total Fundraising Expense | $100,517 |
| Professional Fundraising Fees | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Other Salaries and Wages | $2,192,679 | $693,380 | $61,794 | $2,947,853 |
| Grants to Domestic Individuals | $1,438,300 | - | - | $1,438,300 |
| Other Employee Benefits | $418,531 | $157,402 | $11,795 | $587,728 |
| Depreciation Depletion | $287,699 | $287,698 | - | $575,397 |
| Interest | - | $294,359 | - | $294,359 |
| Payroll Taxes | $156,261 | $58,767 | $4,404 | $219,432 |
| Other Expenses | $169,872 | - | - | $169,872 |
| Occupancy | $136,082 | - | - | $136,082 |
| Current Officers, Directors, Trustees, and Key Employees | - | $131,250 | - | $131,250 |
| Insurance | $121,050 | - | - | $121,050 |
| Fees for Services Other | $94,672 | $18,500 | - | $113,172 |
| Office Expenses | - | $72,189 | - | $72,189 |
| All Other Expenses | $59,608 | $10,344 | - | $69,952 |
| Fees for Services Accounting | - | $35,947 | - | $35,947 |
| Conferences and Meetings | - | - | $22,524 | $22,524 |
| Travel | $16,403 | - | - | $16,403 |
| Advertising | $10,397 | - | - | $10,397 |
| Fees for Services Legal | - | $9,488 | - | $9,488 |
| Total Functional Expenses | $5,447,736 | $1,769,324 | $100,517 | $7,317,577 |
| Line Item | Amount |
|---|---|
| Total Expenses per Form 990 | $7,317,577 |
| Expenses per Audited Statements | $5,879,277 |
| Total Expenses per Audited Statements | $5,879,277 |
| Expenses Not Reported on Financial Statements | $1,438,300 |
| Other Expense Adjustments | $1,438,300 |
| Line Item | Amount |
|---|---|
| Fundraising Gross Income | $15,707 |
| Fundraising Direct Expenses | $5,581 |
| Professional Fundraising Fees | $0 |
| Event | Gross Receipts | Gross Revenue | Direct Expenses | Net Income |
|---|---|---|---|---|
| 1 | $15,707 | $15,707 | $5,581 | $10,126 |
| Total Events | $15,707 | $15,707 | $5,581 | $10,126 |
| Liability | Amount |
|---|---|
| Interest rate swap | $952,014 |
“The 990 form and the related schedules are provided to and reviewed by select members of the board as well as management prior to submittal to the respective tax agencies.”
“All board members as well as key employees and management are required to immediately disclose any relationship that may potentially give rise to a conflict of interest.”
“Compensation for Head of School is discussed and set by the board of directors and is reviewed per annum. Remainder of senior administration is approved through the budget process which is evaluated and reviewed annually.”
“All compensation for key personnel is approved through the budget process by the board of directors which is evaluated and reviewed annually.”
“The organization makes available its governing documents, conflict of interest policy and other policies and procedures upon request. The financial statements are also made available upon request. The 990 filing and the related schedules are made available upon request and can also be found on Guidestar.com, which is an independent entity that makes available via their website certain nonprofit information including but not limited to the Form 990.”
“Organizations Mission (Page 1, Part I, Line 1 & Page 2, Part III, Line 1): Princeton Montessori Society is comprised of Princeton Montessori School (PMS) and Princeton Center for Teacher Education (PCTE). The Society provides Motenssori education for children from infancy through middle school, trains prospective Montessori teachers, and educates parents. Founded in 1968, Princeton Montessori School is an independent, co-educational day school, dedicated to the highest quality education of children and developing passion and nurturing the potential in each child, through the values and principles of the Montessori philosophy. We promote intrinsic motivation, independence, social responsibility, and a love of learning so that as global citizens, our students can lead fulfilling lives and work to better the world. PCTE, founded in 1989, is dedicated to quality Montessori teacher training. The teachers learn to nurture the childs innate abilities and self-exploration that build skills and a foundation for the future.”
“The conservation easement is part of the land that is owned by the Princeton Montessori Society. Therefore, the easement is an asset on the balance sheet.”
“Tuition assistance in the amount of $1,438,300.”
“Tuition assistance in the amount of $1,438,300.”
“Generally accepted accounting principles prescribe how an organization should measure, recognize, present and disclose in its financial statements tax positions that the organization has taken on its information returns. The Organization regularly reviews its tax positions taken and as reflected in its financial statements, with regard to issues affecting tax matters. The Organization has concluded that no tax benefits or liabilities are required to be recognized in accordance with generally accepted accounting principles.The Organizations tax and information returns are generally subject to examination by taxing authorities for three years, including 2014, 2015, and 2016.”
“Part XI, Line 2A (Net Unrealized Gains on Investments) - Unrealized gain on interst rate swap in the amount of $393,285. Unrealized gain on investment in the amount of $1,517.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
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| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 56696 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 150057 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 82283 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 128331 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | See Schedule O |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 10397 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 10397 |
| IRS990/AllOtherContributionsAmt | 0 | 156950 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 10344 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 59608 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 69952 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | Dale Santos |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6099244594 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 487 Cherry Valley Road |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Princeton |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | NJ |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 08540 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 1623880 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 1755699 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/ManagementAndGeneralAmt | 0 | 131250 |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 131250 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConferencesMeetingsGrp/FundraisingAmt | 0 | 22524 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 22524 |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | true |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 156950 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 1438300 |
| IRS990/CYInvestmentIncomeAmt | 0 | 1132 |
| IRS990/CYOtherExpensesAmt | 0 | 1993014 |
| IRS990/CYOtherRevenueAmt | 0 | 10126 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 6907620 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -241749 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 3886263 |
| IRS990/CYTotalExpensesAmt | 0 | 7317577 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 100517 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 7075828 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 2662785 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 2878343 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 287698 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 287699 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 575397 |
| IRS990/Desc | 0 | The Organization is an independent school that offers educational programs for children from eight weeks of age through eighth grade. The Organization is dedicted to providing the highest quality education of children according to the values and principles of the Montessori philosphy. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 74 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 5447736 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/ManagementAndGeneralAmt | 0 | 35947 |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 35947 |
| IRS990/FeesForServicesLegalGrp/ManagementAndGeneralAmt | 0 | 9488 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 9488 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 18500 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 94672 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 113172 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 0.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 2.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 40.00 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 40.00 |
| 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/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | 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/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Peter Egbert |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Maeve Egner |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 2 | Lee Gardner |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 3 | Joe Hargrove |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 4 | Ugur Koyluoglu |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 5 | Sunanda Nair-Bidkar |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 6 | Jennifer Ni |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 7 | Rita Zetterberg |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 8 | Dale Santos |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 9 | Michelle Morrison |
| 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/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 56446 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 131250 |
| 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/ReportableCompFromRltdOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | Board of Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Board of Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Board of Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Board of Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Board of Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Board of Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Board of Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Board of Director |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Director of Finance |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | Executive Director |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 1968 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | true |
| IRS990/FundraisingDirectExpensesAmt | 0 | 5581 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 15707 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 8 |
| IRS990/GrantAmt | 0 | 1438300 |
| IRS990/GrantsToDomesticIndividualsGrp/ProgramServicesAmt | 0 | 1438300 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 1438300 |
| IRS990/GrantsToIndividualsInd | 0 | true |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossReceiptsAmt | 0 | 7081409 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 8 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 1 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 121050 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 121050 |
| IRS990/InterestGrp/ManagementAndGeneralAmt | 0 | 294359 |
| IRS990/InterestGrp/TotalAmt | 0 | 294359 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 1132 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 1132 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 59369 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 62013 |
| IRS990/IRPDocumentCnt | 0 | 35 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 7575817 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 7249867 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 6899234 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 14475051 |
| IRS990/LegalDomicileStateCd | 0 | NJ |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | See Schedule O |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 77625 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 78750 |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | -1603102 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | -1450049 |
| IRS990/NetIncmFromFundraisingEvtGrp/ExclusionAmt | 0 | 10126 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 10126 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 394802 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 136082 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 136082 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 72189 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 72189 |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 8095 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 36595 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherEmployeeBenefitsGrp/FundraisingAmt | 0 | 11795 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 157402 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 418531 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 587728 |
| IRS990/OtherExpensesGrp/Desc | 0 | Direct educational expenses |
| IRS990/OtherExpensesGrp/Desc | 1 | Supplies |
| IRS990/OtherExpensesGrp/Desc | 2 | Telephone |
| IRS990/OtherExpensesGrp/Desc | 3 | Maintenance and repairs |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 294453 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 36466 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 15263 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 169872 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 294453 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 36466 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 15263 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 169872 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 1345299 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 952014 |
| IRS990/OtherSalariesAndWagesGrp/FundraisingAmt | 0 | 61794 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 693380 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 2192679 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 2947853 |
| IRS990/OtherWebsiteInd | 0 | X |
| IRS990/OwnWebsiteInd | 0 | X |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/FundraisingAmt | 0 | 4404 |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 58767 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 156261 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 219432 |
| IRS990/PledgesAndGrantsReceivableGrp/EOYAmt | 0 | 10000 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 385915 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 367598 |
| IRS990/PrincipalOfficerNm | 0 | Dale Santos |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 611710 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 611710 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | Tuition revenue |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | Other income |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 6674482 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 233138 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 6674482 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 233138 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYContributionsGrantsAmt | 0 | 183921 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 699334 |
| IRS990/PYInvestmentIncomeAmt | 0 | 1940 |
| IRS990/PYOtherExpensesAmt | 0 | 2010966 |
| IRS990/PYOtherRevenueAmt | 0 | 3830 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 6285654 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | -193971 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 3959016 |
| IRS990/PYTotalExpensesAmt | 0 | 6669316 |
| IRS990/PYTotalRevenueAmt | 0 | 6475345 |
| IRS990/QuidProQuoContributionsInd | 0 | false |
| IRS990/RcvFndsToPayPrsnlBnftCntrctInd | 0 | false |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | -241749 |
| IRS990/RegularMonitoringEnfrcInd | 0 | true |
| IRS990/RelatedEntityInd | 0 | false |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | true |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | true |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 5236182 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 108394 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 113520 |
| IRS990ScheduleA/SchoolInd | 0 | X |
| 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 | true |
| IRS990ScheduleD/BuildingsGrp/BookValueAmt | 0 | 6213830 |
| IRS990ScheduleD/BuildingsGrp/DepreciationAmt | 0 | 7007971 |
| IRS990ScheduleD/BuildingsGrp/OtherCostOrOtherBasisAmt | 0 | 13221801 |
| IRS990ScheduleD/EquipmentGrp/BookValueAmt | 0 | 239623 |
| IRS990ScheduleD/EquipmentGrp/DepreciationAmt | 0 | 567846 |
| IRS990ScheduleD/EquipmentGrp/OtherCostOrOtherBasisAmt | 0 | 807469 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 1438300 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 5879277 |
| IRS990ScheduleD/FootnoteTextInd | 0 | X |
| IRS990ScheduleD/HistoricStrctrEasementsAftrCnt | 0 | 1 |
| IRS990ScheduleD/HistoricStructureEasementsCnt | 0 | 1 |
| IRS990ScheduleD/LandGrp/BookValueAmt | 0 | 445781 |
| IRS990ScheduleD/LandGrp/OtherCostOrOtherBasisAmt | 0 | 445781 |
| IRS990ScheduleD/NetUnrealizedGainsInvstAmt | 0 | 394802 |
| IRS990ScheduleD/OtherAssetsOrgGrp/BookValueAmt | 0 | 28500 |
| IRS990ScheduleD/OtherAssetsOrgGrp/BookValueAmt | 1 | 8095 |
| IRS990ScheduleD/OtherAssetsOrgGrp/Desc | 0 | Security deposits |
| IRS990ScheduleD/OtherAssetsOrgGrp/Desc | 1 | Cash restricted for escrow deposit |
| IRS990ScheduleD/OtherExpensesNotIncludedAmt | 0 | 1438300 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 952014 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | Interest rate swap |
| IRS990ScheduleD/OtherRevenuesNotIncludedAmt | 0 | 1438300 |
| IRS990ScheduleD/ProtectionNaturalHabitatInd | 0 | X |
| IRS990ScheduleD/RevenueNotReportedAmt | 0 | 394802 |
| IRS990ScheduleD/RevenueNotReportedFinclStmtAmt | 0 | 1438300 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 5637528 |
| IRS990ScheduleD/Section170hRqrStsfdInd | 0 | false |
| IRS990ScheduleD/StatesEasementsHeldCnt | 0 | 1 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | The conservation easement is part of the land that is owned by the Princeton Montessori Society. Therefore, the easement is an asset on the balance sheet. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 1 | Tuition assistance in the amount of $1,438,300. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 2 | Tuition assistance in the amount of $1,438,300. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 3 | Generally accepted accounting principles prescribe how an organization should measure, recognize, present and disclose in its financial statements tax positions that the organization has taken on its information returns. The Organization regularly reviews its tax positions taken and as reflected in its financial statements, with regard to issues affecting tax matters. The Organization has concluded that no tax benefits or liabilities are required to be recognized in accordance with generally accepted accounting principles.The Organizations tax and information returns are generally subject to examination by taxing authorities for three years, including 2014, 2015, and 2016. |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 4 | Part XI, Line 2A (Net Unrealized Gains on Investments) - Unrealized gain on interst rate swap in the amount of $393,285. Unrealized gain on investment in the amount of $1,517. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Reports conservation easements (Part II, line 9) |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Other revenues included on Form 990 (Part XI, line 4b) |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Other expenses included on Form 990 (Part XII, line 4b) |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Footnote for uncertain tax position under FIN 48 (Part X) |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 4 | General Explanation Attachment |
| IRS990ScheduleD/TotalAcreageCnt | 0 | 476.00 |
| IRS990ScheduleD/TotalBookValueLandBuildingsAmt | 0 | 6899234 |
| IRS990ScheduleD/TotalBookValueOtherAssetsAmt | 0 | 36595 |
| IRS990ScheduleD/TotalEasementsCnt | 0 | 1 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 7317577 |
| IRS990ScheduleD/TotalLiabilityAmt | 0 | 952014 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 7075828 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 6032330 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 5879277 |
| IRS990ScheduleD/WrittenPolicyMonitoringInd | 0 | false |
| IRS990ScheduleE/ComplianceWithRevProc7550Ind | 0 | true |
| IRS990ScheduleE/DiscriminateRaceAdmissPlcyInd | 0 | false |
| IRS990ScheduleE/DiscriminateRaceAthltProgInd | 0 | false |
| IRS990ScheduleE/DiscriminateRaceEducPlcyInd | 0 | false |
| IRS990ScheduleE/DiscriminateRaceEmplmFcultyInd | 0 | false |
| IRS990ScheduleE/DiscriminateRaceOtherActyInd | 0 | false |
| IRS990ScheduleE/DiscriminateRaceSchsInd | 0 | false |
| IRS990ScheduleE/DiscriminateRaceStdntsRghtsInd | 0 | false |
| IRS990ScheduleE/DiscriminateRaceUseOfFcltsInd | 0 | false |
| IRS990ScheduleE/GovernmentFinancialAidRcvdInd | 0 | false |
| IRS990ScheduleE/GovernmentFinancialAidRvkdInd | 0 | false |
| IRS990ScheduleE/MaintainCpyOfAllSolInd | 0 | true |
| IRS990ScheduleE/MaintainCpyOfBrochuresEtcInd | 0 | true |
| IRS990ScheduleE/MaintainRacialCompRecsInd | 0 | true |
| IRS990ScheduleE/MaintainScholarshipsRecsInd | 0 | true |
| IRS990ScheduleE/NondiscriminatoryPolicyStmtInd | 0 | true |
| IRS990ScheduleE/PlcyPblczdViaBroadcastMediaInd | 0 | true |
| IRS990ScheduleE/PolicyStmtInBrochuresEtcInd | 0 | true |
| IRS990ScheduleE/SupplementalInformationDetail/ExplanationTxt | 0 | It is the policy of Organization not to discriminate on the basis of race, color, religion, sex, national origin, age or disability in its educational programs and its related policies and procedures. |
| IRS990ScheduleE/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Description of nondiscriminatory policy (Question 3) |
| IRS990ScheduleG/FundraisingEventInformationGrp/DirectExpenseSummaryEventsAmt | 0 | 5581 |
| IRS990ScheduleG/FundraisingEventInformationGrp/Event1Nm | 0 | 1 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossReceiptsEvent1Amt | 0 | 15707 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossReceiptsTotalAmt | 0 | 15707 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossRevenueEvent1Amt | 0 | 15707 |
| IRS990ScheduleG/FundraisingEventInformationGrp/GrossRevenueTotalEventsAmt | 0 | 15707 |
| IRS990ScheduleG/FundraisingEventInformationGrp/NetIncomeSummaryAmt | 0 | 10126 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OthDirectExpnssTotalEventsAmt | 0 | 5581 |
| IRS990ScheduleG/FundraisingEventInformationGrp/OtherDirectExpensesEvent1Amt | 0 | 5581 |
| IRS990ScheduleI/GrantRecordsMaintainedInd | 0 | true |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/CashGrantAmt | 0 | 159120 |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/CashGrantAmt | 1 | 1279180 |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/GrantTypeTxt | 0 | Scholarship for students attending PMS Prog |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/GrantTypeTxt | 1 | Tuition assistance for students attending PMS Prog |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/NonCashAssistanceDesc | 0 | Tuition scholarships |
| IRS990ScheduleI/GrantsOtherAsstToIndivInUSGrp/NonCashAssistanceDesc | 1 | Tuition assistance |
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