Massachusetts · Nonprofit
CASTLE SQUARE TENANTS ORGANIZATION INC
CASTLE SQUARE TENANTS ORGANIZATION INC (Massachusetts) receives grants from 4 organizations whose IRS filings report $40,005 to it, the largest being BARR FOUNDATION ($30,000). 0 of them have funded it in more than one year.
Against its field
CASTLE SQUARE TENANTS ORGANIZATION INC runs a healthier operating margin than three-quarters of the 3,969 housing & shelter nonprofits its size.
this organization peer median middle 50% of peers· 3,969 housing & shelter nonprofits $1M–$10M, FY2024
Three funders worth looking at
Grantmakers with no record of funding this organization, ranked by how strongly the co-funder graph and the mission embeddings agree. The evidence is in section 03.
- The Hyams Foundation Incshared funders
- The Housing Partnership Network Incportfolio match
- Charlesbank Homesportfolio match
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2020 3% · 2023 3% · 2024 2%. Grants only. Government contracts and fees sit inside program revenue.
2% of CASTLE SQUARE TENANTS ORGANIZATION INC’s revenue is contributions — about as donation-reliant as the typical peer (39% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 1 of the last 8 reported years ran a deficit.
reserve
Who funds it, year by year
2017 → 2020: the base broadened from 1 funder to 3 funders, grant income rose $5k → $35k.
1 of 4 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 0% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of CASTLE SQUARE TENANTS ORGANIZATION INC’s funders (the co-funder graph). Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
CASTLE SQUARE TENANTS ORGANIZATION INC leans on a few funders — its largest provides 75% of grant income and the top three 100%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
25% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund CASTLE SQUARE TENANTS ORGANIZATION INC.
Largest funder’s share by year: 2017 100% · 2020 86% — diversifying over time.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Where its funders are
100% of CASTLE SQUARE TENANTS ORGANIZATION INC's grant income comes from Massachusetts funders.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $5 arriving through sponsors registered in 1 state is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Funders to approach
Grantmakers that don’t fund you yet, surfaced two ways: they back organizations that share your funders, or their grantees resemble your mission. The ones both signals agree on come first. Your 4 funders put you under-funded among the 400 organizations that share them.
- The Hyams Foundation Incshared fundersMA · backs 58 organizations that share your funders
- The Housing Partnership Network Incportfolio matchits grantees resemble your mission
- Charlesbank Homesportfolio matchits grantees resemble your mission
- Leader Bank Charitable Foundation Corporationportfolio matchits grantees resemble your mission
- Enterprise Community Partners Incportfolio matchits grantees resemble your mission
- Bowdoin Apartments Corporationportfolio matchits grantees resemble your mission
- Neighborhood Reinvestment Corporationportfolio matchits grantees resemble your mission
- Dudley Street Neighborhood Initiative Incportfolio matchits grantees resemble your mission
- National Equity Fund Incportfolio matchits grantees resemble your mission
- Lawrence Model Lodging Houses Trust Donald E Vaughan Et Al Trusteesportfolio matchits grantees resemble your mission
- Community Action Pioneer Valleyportfolio matchits grantees resemble your mission
- Eastern Cambridge Foundationportfolio matchits grantees resemble your mission
From the co-funder graph (funders backing at least two comparable organizations, shrunk for grantee count, donor-advised and mega-funds excluded) and the universe embeddings. A research starting point; overlap is association, not a guarantee of fit.
Organizations like CASTLE SQUARE TENANTS ORGANIZATION INC
Nonprofits whose mission and program text most resemble this one, by semantic similarity over the universe of US filings — the closest peers, and often the clearest route to shared or prospective funders.
In Massachusetts
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
57% of spending goes to programs.
Governance
Public support
86%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Footprint & structure
Files a return copy in 1 state
Part of a family of 7 related entities
- Castle Square Tenants Organization 2020 Charitable Trust · exempt
- Csto Winn Manager LLC · partnership
- Csto Winn Developer LLC · partnership
- Eva White Development Company LLC · partnership
- Csto Winn Owner LLC · partnership
Screen this organization
A dated, signed PDF of the compliance screen for CASTLE SQUARE TENANTS ORGANIZATION INC: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds CASTLE SQUARE TENANTS ORGANIZATION INC?
- CASTLE SQUARE TENANTS ORGANIZATION INC (Massachusetts) receives grants from 4 organizations whose IRS filings report $40,005 to it, the largest being BARR FOUNDATION ($30,000). 0 of them have funded it in more than one year.
- How many funders does CASTLE SQUARE TENANTS ORGANIZATION INC have?
- IRS filings report 4 organizations giving $40,005 in grants to CASTLE SQUARE TENANTS ORGANIZATION INC.
- Who is the largest funder of CASTLE SQUARE TENANTS ORGANIZATION INC?
- BARR FOUNDATION is the largest funder on record, with $30,000 in grants. The full list of funders is on this page.
- How can an organization like CASTLE SQUARE TENANTS ORGANIZATION INC find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Massachusetts. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2024 (financials across 2017–2024), and the filings of 4funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported August 27, 2026. What this page cannot tell you · view filing