10 Montgomery Place (Montten Slope)
10 Montgomery Place and 133 Eighth Avenue, Brooklyn, NY 11215
BBL 3010730005 · BIN 3325196
- Year built
- 1910
- Type
- Cooperative
- Units
- 33
- Floors
- 4
- Landmark
- Designated
- Flip tax
- The corporation collects one — flip-tax income appears in the audited statements — but the rate is not documented in the materials on file; confirm with the managing agent
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 10 Montgomery Place (Montten Slope) would likely sell for today, what it costs to sell, and what you’d walk away with — reviewed personally against condition, exposures, renovation quality, and the competition actually on the market.
The number that matters most here is February 1, 2027. That is when Montten Slope's $1.95 million underlying mortgage comes due in full, per the co-op's audited statements. The loan was placed in 2017 at 3.50 percent, interest-only. ACRIS shows no refinancing since. A buyer in the fall of 2026 is buying into a corporation that has to refinance within months, at rates well above what it pays now.
The math is simple. Each percentage point on $1.95 million adds $19,500 a year in interest. Maintenance income was about $397,000 in fiscal 2018. On those figures, a refinance at 6 percent would add about $49,000 a year, or roughly 12 percent of maintenance. The real effect depends on the new rate, whether the board adds amortization, and what maintenance is today. Ask the managing agent for the refinancing status and the board's plan before you sign.
The buildings are the other reason this address stands out. The LPC building database attributes both to Montrose W. Morris, the Brooklyn architect of the Alhambra and the Renaissance apartment houses in Bedford-Stuyvesant. Here he designed a pair of four-story Beaux-Arts walk-ups in brick, terra cotta and limestone, completed in 1910–11 at the corner of Eighth Avenue and Montgomery Place.
The lot is inside the Park Slope Historic District. That matters on this corner, because the building across Montgomery Place is not. 27 Prospect Park West, on block 1072, was left out of the district. Montten Slope sits on block 1073, and LPC's own database lists lot 5 as designated. The 1982 offering plan already warned purchasers that the building was subject to landmark designation.
Architecture and unit composition
The corporation owns two buildings on one lot: the Eighth Avenue building at the corner and 10 Montgomery Place on the side street. Department of Buildings filings mostly count 24 apartments on the Eighth Avenue side and 16 on Montgomery Place, the original 40 (individual filings vary by one or two). Combinations have since brought the residential count to 33, per the 2018 audit. Combined apartments show up in ACRIS as double-letter units.
Both buildings are walk-ups, with no elevator. A superintendent's apartment in the basement was kept out of the offering. The house rules require at least 80 percent of each apartment's floors, outside kitchens and baths, to be carpeted or covered with sound-reducing material. The rules also refer to assigned storage units and a shared courtyard.
Building operations
The audited statements on file, for the fiscal year ended June 30, 2018, show a small, stable corporation:
- Maintenance of about $397,000 a year, with a 1 percent increase effective August 1, 2016.
- Real estate taxes of about $201,000 — about half of operating costs.
- Reserves of about $471,000. The governing documents do not require a reserve, and no reserve study has been done.
- No special assessment in effect as of the statements.
- The sponsor still held 728 shares, about 4 percent of the total.
The 2017 refinance paid off the prior $1.5 million loan and raised $450,000 of new money; about $364,000 was moved into reserves. The statements also show an "abatement assessment" of about $54,000 a year billed to shareholders. This indicates the corporation bills back some or all of the co-op tax abatement; confirm how it works now with the managing agent.
Policy framework
- Admission: The board's application asks for two years of tax returns, recent pay stubs, bank and checking statements, an employer letter, two references (one from a prior landlord), the contract of sale and a mortgage commitment. A credit check comes before the board reviews the application or schedules an interview, per the application on file.
- Subletting: One- or two-year sublets with a fee, then a five-year bar on subletting again.
- Pets: Written board approval first; breed limits for insurance.
- Alterations and laundry: Washer/dryers only by alteration agreement; construction noise weekdays 8:30 a.m. to 5 p.m.; moves Monday through Saturday with a deposit and fee.
- Flip tax: Collected; confirm the current rate.
The application and house rules on file are older. Confirm every item with the managing agent at offer stage.
Recent sales
Montten Slope trades in the Park Slope prewar walk-up co-op tier, where pricing reads per room. Its apartments sit a block from the park inside the historic district, and combined units give it a few larger lines, which is rare in walk-up stock. Through 2025, landmarked prewar co-ops near Prospect Park West held steady demand, and the corner's small unit count keeps turnover low. The refinance will affect maintenance and belongs in any price discussion until it closes. Unit-level transaction history is maintained in The Roebling Research Library and shared with clients during diligence.
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Recent transfers at this building, sourced from NYC Department of Finance records. Apartment-level detail (line, condition, asking-price context) verified upon consultation request.
| Date | Unit | Price |
|---|---|---|
| Nov 21, 2025 | 4A | $1,300,000 |
| Feb 13, 2025 | 2E | $928,888.88 |
| Dec 23, 2024 | 3B | $999,990 |
| Sep 2, 2022 | 1AB | $1,450,000 |
| Sep 17, 2021 | 1A | $999,000 |
| Jul 19, 2021 | 1EF | $995,000 |
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-01073-0005) and verified listing data. Apartment-level facts (line, condition, asking-price context) curated and cross-verified by The Roebling Team research desk. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price.
At the recent median sale of $1000K (3 transfers since 2024), a buyer putting 25% down would pay about $12,300 to close, or 1.2% of the price.
- Mansion tax: $0
- No mortgage recording tax or title insurance on a co-op purchase
- Attorneys, lender, building fees and filings: $12,300
Assumes a resale (the seller pays transfer taxes), a $4,500 attorney fee and a mortgage on the rest.
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What to know if you’re buying
Get the refinancing terms first. The mortgage comes due February 1, 2027. Ask for a term sheet or commitment, the new rate and amortization, and the board's maintenance projection. If the loan has closed by the time you read this, get the new terms.
Price the walk-up and the line. No elevator in either building. Floor, exposure and whether the apartment is a combination separate prices more than anything else.
Plan on landmark review for exterior work. Windows, façade and roof work go through LPC.
Know the sublet rules before you buy. One or two years, with a fee, then five years before you can sublet again. Buyers who might need to rent later should plan around it.
What to know if you’re selling
Lead with the architecture and the designation. A documented Montrose W. Morris building inside the historic district, a block from Prospect Park West.
Answer the mortgage question in the listing package. Buyers' attorneys will find the 2027 maturity in the financials. A managing-agent letter on the refinancing status keeps it from slowing the deal.
Market combinations as the scarce product. Combined apartments are the largest units in the building and have few equivalents in walk-up co-op stock nearby.
Comparable buildings
If you're considering 10 Montgomery Place, also evaluate:
- 27 Prospect Park West — the 1928 park-front co-op across Montgomery Place, outside the district, with its own mortgage maturity to underwrite
- 35 Prospect Park West — Emery Roth's 1929 co-op on the same block, facing the park
- 140 8th Avenue — the 1936 Art Deco co-op at Carroll Street, one block north on Eighth Avenue
- 90 8th Avenue — Sugarman & Berger's eleven-story 1927 co-op at President Street, inside the district
- 814 Carroll Street — the 1950 doorman co-op at 130 Eighth Avenue, one block north
- 300 8th Avenue — a 1920 elevator co-op of small apartments on the district line
- 220 Berkeley Place — a 1955 elevator co-op inside the historic district
- 412 8th Avenue — a pair of 1920 walk-ups on Eighth Avenue, converted to a condominium in 2010
More Park Slope buildings
- 1 Plaza Street West — 1927 co-op by Sugarman & Berger
- 1 Prospect Park West — 1925 condominium
- 100 Sterling Place — 1990 condominium
- 11 Sterling Place (Sterling Court) — 1935 condop
- 113–117 Sterling Place (Sterling Atrium), 113 and 117 Sterling Place — 1920 co-op
- 125 Prospect Park West — 1916 co-op
The neighborhood
For the full neighborhood — its buildings, character, and market — read The Roebling Team Guide to Park Slope.
The full playbook — what goes in the package, how boards read your financials, the interview, and the timeline — plus sample cover, reference, and personal letters you can adapt.
How to read the facts on this page. Items attributed to an offering plan describe the building as it was offered at that filing — unit mix, square footage, the amenity program as planned. They are not a statement about how the building operates today. Tax and compliance figures are sourced separately to current City records and carry their own dates. House rules, staffing and fee policy can change by board resolution without any public filing: treat every policy line here as a starting point for diligence and confirm it with the managing agent. Where this page compares one building or neighborhood to another, that is our analysis of the recorded record — it names the measure, the period and the sample it rests on, and it is an observation about medians rather than a prediction about any particular apartment.
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