Castle Square Tenants Organization 2020 Charitable Trust
Castle Square Tenants Organization 2020 is a public charity based in Boston, Massachusetts. Its charitable trust was formed in November 2020 with a contribution from Castle Square Tenants Organization (CSTO), which manages Castle Square Apartments, a 500-unit affordable housing development in Boston’s South End. The Trust makes grants to support CSTO and other organizations advancing its mission.
Castle Square Tenants Organization 2020 Charitable Trust at a glance
In short: Castle Square Tenants Organization 2020 Charitable Trust gave $355K across 12 grants in 2024 (avg $30K), mostly in Massachusetts. Source: 2024 IRS Form 990.
- Annual giving (2024)
- $354,555
- Grants made (2024)
- 12
- Average grant
- $29,546
- Median grant
- $37,278
- Total assets
- $20,897,102
- +7.8% vs 2023
- Primary geography
- Massachusetts (97% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990, 2024 View filing
Data from IRS Form 990, 2024; updated September 2026.
How to apply to Castle Square Tenants Organization 2020 Charitable Trust
- Contact
Mailing address: 476 Tremont Street, Boston, MA 02116
Phone: (617) 357-8548
Website: https://cstoboston.org
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Open Grants
2 open opportunities from Castle Square Tenants Organization 2020 Charitable Trust
CSTO Trust Grant Program
Castle Square Tenants Organization 2020 Charitable Trust
Amount
Up to $40,000
Deadline
Deadline not published
CSTO Young Adult Resident Scholarship Program
Castle Square Tenants Organization 2020 Charitable Trust
Amount
Up to $10,000
Deadline
Deadline not published
Who Castle Square Tenants Organization 2020 Charitable Trust funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2024
The largest 2024 recipient was United South End Settlements ($40K). Together the top 10 received $335K.
Grant Size Distribution
12 grants across all recorded years
The most common grant size was under $50K: 12 grants of 12 (100%).
Geographic Focus
Where this funder awards grants
The Trust’s stated purpose names low-income residents of Boston’s South End and Chinatown and the Greater Boston area. In 2024, 97% of grant dollars went to recipients in Massachusetts and 3% to a recipient in California. The listed 2024 recipients were primarily in Boston and nearby Massachusetts communities.
Grant Distribution by State
Share of 2024 grant dollars across all 12 itemized grants.
States
Cities
Giving History
Giving Over Time
Total grant dollars and number of grants per year
In 2024 it made 12 grants totaling $355K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| United South End Settlements Boston, MA | Grant Uses Club 48 (Childcare and After-School) | $40,000 |
| The Boston Higher Education Resource Center Inc Boston, MA | Grant passport to college and alumni success programs-lower roxbury, south end, and chinatown sites. | $40,000 |
| Boston Chinatown Neighborhood Center Boston, MA | Grant BCNC Youth Center | $40,000 |
| Chica Inc Quincy, MA | Grant Chica Project at Blackstone Community Center | $40,000 |
| More Than Words Waltham, MA | Grant more than words youth boston career and readiness supports | $40,000 |
| Write Boston Inc Jamaica Plain, MA | Grant catalyzing youth agency & media literacy: a write boston & st. Stephen's youth programs partnership (419 shawmut ave, boston ma 02118). | $39,555 |
| Youthbuild Boston Inc Roxbury, MA | Grant the designer-engaging high school youth in design professions (1884 washington street, boston ma 02118). | $35,000 |
| Soccer Unity Project Boston, MA | Grant South End Soccer Youth Programs | $30,000 |
| Philanthropy MA Inc Boston, MA | Grant for sponsorship of gma foundations' funder community's 17/25 fund for young adults | $20,000 |
| Tenants' Development Corporation Boston, MA | Grant Youth Peer Leadership After School Program (Yplasp) | $10,000 |
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Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants |
|---|---|---|---|---|---|
| 2024 | $20,897,102 | $445,750 | $445,750 | $354,555 | 12 |
| 2023 | $19,381,203 | $73,665 | $73,665 | — | — |
| 2022 | $17,103,886 | $38,728 | $38,628 | — | — |
| 2021 | $20,830,426 | $53,346 | $53,346 | — | — |
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
The Trust states that it supports CSTO and other organizations that enhance educational and cultural experiences, affordable housing, or economic opportunities for low-income residents. Its vision is for low- and moderate-income residents and residents of all races and ethnicities to have the power, voice, and resources to address racial and societal wealth disparities.
The Trust’s grant program identifies youth/child development and education as a priority, including out-of-school-time programs, youth leadership, and college, career, or job exploration and readiness for school-age children and young people transitioning to adulthood. The Trust also reports supporting tenant-centered initiatives in affordable housing communities.
The 2024 grants illustrate support for varied youth-serving organizations. For example, More Than Words describes its mission as empowering youth facing foster care, court involvement, homelessness, or being out of school through taking charge of a business. Boston Chinatown Neighborhood Center says it provides services to help children, youth, and families attain greater economic stability and social well-being. YouthBuild Boston describes its work as providing education and skills training for low-income youth and developing employment opportunities. These are the grantees’ descriptions of their own missions.
Grantmaking
In filing year 2024, the Trust reported 12 grants totaling $354,555. Grant amounts ranged from $10,000 to $40,000, with a median of $37,278. Its website reports that Trustees awarded mini grants to nine organizations in February 2025 and made final awards to 20 organizations in June 2025, totaling $868,000.
Among the 2024 grants, the Trust awarded $40,000 each to United South End Settlements for Club 48 childcare and after-school programming; The Boston Higher Education Resource Center for Passport to College and alumni success programs; Boston Chinatown Neighborhood Center for its youth center; CHICA Inc. for its project at Blackstone Community Center; and More Than Words for youth career and readiness supports. Other grants included $39,555 to Write Boston, $35,000 to YouthBuild Boston, and $30,000 to Soccer Unity Project.
The Trust’s filing says grants are made to organizations tax-exempt under section 501(c)(3), including CSTO, and that Trustees select organizations consistent with the Trust’s purposes. It also says the Trust maintains grant approval documentation and accounting records, and that grants are subject to oversight and reporting requirements described in a grant letter agreement. The website labels the CSTO Trust Grant Program as currently open; the available information does not specify an application process or deadline.
The Young Adult Resident Scholarship is a separate program for Castle Square residents pursuing post-secondary education, not a grant program for outside applicant organizations. The program information says $100,000 was awarded to 17 residents for the 2025–2026 academic year. The 2026 application deadline was May 3, 2026, a past deadline.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2024 filing lists Jonathan Klein as chair, Ann Moy as vice chair, Kathryn McHugh as treasurer, and Vincent O’Donnell as clerk. Directors listed were Terrance Woolfork, Yvonne Holmes (until October 2024), Chu Huang, and Vernon Mills (as of October 2024).
The Trust’s website says it is governed by up to eight trustees appointed by CSTO’s Board of Directors, with four Castle Square tenants and four independent trustees.
Castle Square Tenants Organization 2020 Charitable Trust is led by Jonathan Klein, Chair since 2021 (on filings since 2020); none of the 8 officers listed in 2024 report compensation.
Officers on the 2024 filing
Jonathan Klein
Chair
Trustee → Chair, 2021
On filings since 2020
2 hrs/week
No compensation reported
Chu Huang
Director
Trustee → Director, 2021
On filings since 2020
1 hr/week
No compensation reported
Terrance Woolfork
Director
Trustee → Director, 2021
On filings since 2020
1 hr/week
No compensation reported
Yvonne Holmes
Director
Trustee → Director, 2021
On filings since 2020
1 hr/week
No compensation reported
Vernon Mills
Director
New on the 2024 filing
1 hr/week
No compensation reported
Ann Moy
Vice Chair
Trustee → Vice Chair, 2021
On filings since 2020
1 hr/week
No compensation reported
Kathryn McHugh
Treasurer
Trustee → Treasurer, 2021
On filings since 2020
2 hrs/week
No compensation reported
Vincent O'Donnell
Clerk
Trustee → Clerk, 2021
On filings since 2020
1 hr/week
No compensation reported
Former officers (1)
- Former: James Jennings (2020–2022) — Director
Data from IRS Form 990 filings, 2020–2024. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Frequently asked questions about Castle Square Tenants Organization 2020 Charitable Trust
How much does Castle Square Tenants Organization 2020 Charitable Trust give each year?
Castle Square Tenants Organization 2020 Charitable Trust gave $355K across 12 grants in 2024, according to its 2024 IRS Form 990.
What is Castle Square Tenants Organization 2020 Charitable Trust's typical grant size?
Castle Square Tenants Organization 2020 Charitable Trust's median grant in 2024 was $37,278, and its average grant was $29,546, across 12 grants on its 2024 IRS Form 990.
Where does Castle Square Tenants Organization 2020 Charitable Trust give grants?
Castle Square Tenants Organization 2020 Charitable Trust gives mostly in Massachusetts: 97% of the grant dollars itemized on its 2024 IRS Form 990 went to recipients there. The most frequent recipient cities were Boston, MA (7 grants).
Does Castle Square Tenants Organization 2020 Charitable Trust give general operating support?
Not in 2024: none of the 12 grants with a stated purpose on Castle Square Tenants Organization 2020 Charitable Trust's 2024 IRS Form 990 were described as general or operating support.
Who are Castle Square Tenants Organization 2020 Charitable Trust's largest grantees?
Castle Square Tenants Organization 2020 Charitable Trust's largest 2024 grantees include United South End Settlements ($40,000), The Boston Higher Education Resource Center Inc ($40,000) and Boston Chinatown Neighborhood Center ($40,000), according to its 2024 IRS Form 990. Together they received 34% of its itemized 2024 grant dollars.
How large is Castle Square Tenants Organization 2020 Charitable Trust?
Castle Square Tenants Organization 2020 Charitable Trust reported $20.9M in total assets on its 2024 IRS Form 990. Its revenue that year was $446K.
What does Castle Square Tenants Organization 2020 Charitable Trust fund?
The Trust states that it supports CSTO and other organizations that enhance educational and cultural experiences, affordable housing, or economic opportunities for low-income residents. See mission & focus areas ↑
How do I apply for a grant from Castle Square Tenants Organization 2020 Charitable Trust?
Castle Square Tenants Organization 2020 Charitable Trust has no public application process in the sources Grantable reviewed. Check cstoboston.org for current guidelines, or contact the foundation directly before submitting a request.
What is Castle Square Tenants Organization 2020 Charitable Trust's EIN?
Castle Square Tenants Organization 2020 Charitable Trust's EIN (Employer Identification Number) is 85-3810338. IRS Form 990 filing data is available on this page for 2020–2024.
Data last updated September 2026. Sourced from IRS Form 990 filings. Research dossier generated September 2026.
Data update history
(2)
When this profile's IRS filing data changed on Grantable
- Updated Form 990 for fiscal year 2024 (received by the IRS November 12, 2025)
- IRS filings on file for fiscal years 2020–2024
Live grants for the work Castle Square Tenants Organization 2020 Charitable Trust funds
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Cite this profile
Grantable. (2026). Castle Square Tenants Organization 2020 Charitable Trust funder profile. GrantGraph. Retrieved October 21, 2026, from https://grantable.co/funders/castle-square-tenants-organization-2020-charitable-trust-morg_bb6bcb5870c34dae82f86d4fd8cba59a
BibTeX
@misc{grantable_853810338_2026,
author = {{Grantable}},
title = {{Castle Square Tenants Organization 2020 Charitable Trust funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/castle-square-tenants-organization-2020-charitable-trust-morg_bb6bcb5870c34dae82f86d4fd8cba59a},
note = {Accessed 2026-10-21. Data licensed CC BY 4.0}
}The figures on this page are open data under CC BY 4.0: reuse them with credit to Grantable and a link. Download the data.
Figures come from Castle Square Tenants Organization 2020 Charitable Trust's IRS filings (methodology). AI-written summaries, news items and logos are not covered by the open licence. Spot an error? Email hello@grantable.co.
Castle Square Tenants Organization 2020 Charitable Trust down — hundreds of funders to go?