27 Prospect Park West
27 Prospect Park West, Brooklyn, NY 11215
Park Slope, Brooklyn
BBL 3010720040 · BIN 3024968
- Year built
- 1928
- Type
- Cooperative
- Units
- 31
- Floors
- 15
- Flip tax
- The corporation collects one — it appears as an income line in the 2002 trial balance on file. The rate and who pays it must come from the managing agent
- Landmark status
- Not an individual landmark; not in a historic district
- NYC Landmarks Preservation Commission and City Planning records, updated February 2026
- Doorman
- Full-time doorman
Every recorded sale at this building, 2006–2026
Bedroom-by-bedroom medians, the full transfer record, and how units trade against ask.
- 1BR median, 2024
- $725K
- 2 qualifying sales
- Recent range
- $725K – $2.1M
- Listing discount
- 3.3%
- Recorded transfers
- 26
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 27 Prospect Park West 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.
27 Prospect Park West is a fifteen-story tower on a lot about 50 feet wide, at the corner where Montgomery Place meets the park. It went up in 1928, one of the handful of tall prewar apartment buildings on an avenue of mansions and rowhouses. Historical accounts credit it to the developer Samuel Wander, who went on to build 9 Prospect Park West at President Street in 1928–29. On a lot this narrow, the tower was planned with just two apartments a floor. Which exposures each line gets — park, Montgomery Place, or both — should be confirmed from the floor plans for the specific apartment.
The cooperative is older than most on the avenue, and it was organized by the tenants themselves. In 1969 a committee of six tenants sponsored the conversion plan, and the new corporation bought the building from its owners for $560,000, closing in April 1970. At the time, 25 of the 29 apartments were rent-controlled. That makes it roughly a decade older than the sponsor-led conversions nearby at 86–88 Prospect Park West (1978), 9 Prospect Park West (1978–79) and 125 Prospect Park West (1984). There was no investor sponsor, so no block of sponsor-held rental apartments carried over from the conversion, and the corporation has been shareholder-run for over fifty years.
The building is outside the Park Slope Historic District, and the 1973 designation report says so directly: the district runs along this blockfront as far as 25 Prospect Park West, and the rest of the blockfront to the Montgomery Place corner is not included. Every rowhouse lot around it on Carroll Street and Montgomery Place is in. The same line was drawn around the other tall apartment lots on the avenue — 9, 35 and 40 Prospect Park West. The corporation manages its façade, windows and roof without Landmarks review, which matters for a tower that has needed regular masonry work, but the building itself has no Landmarks protection.
Architecture and unit composition
The 1969 plan describes a fireproof building of brick and stone, with a full cellar, street walls rising fifteen stories, then setting back for a penthouse and bulkheads. The main entrance is on Prospect Park West; the service yard opens onto Montgomery Place. The inspecting architect's report found the building "substantially built and well-planned," with well-proportioned rooms.
As offered, the second through fifteenth floors each had two apartments, paired either as seven rooms and three rooms or as six rooms and four rooms, with one or two baths. The penthouse held a single six-room duplex with substantial roof space and a terrace over the south and east walls. The ground floor held three doctors' offices; a superintendent's apartment was reserved on the sixth floor.
That layout has since changed. A first-floor medical office was converted to an apartment in 2001. Department of Buildings filings cover combining 8A and 8B in 2000, two apartments on the 13th floor in 2016, and 7A and 7B in 2021, and ACRIS records 14A and 14B conveyed in a single transfer — which can reflect a combination or two apartments sold together. Department of Buildings filings in 2017 cover interior and exterior work on the penthouse and rooftop tower and an interior renovation on the 16th floor. The likely result is a building with full-floor apartments on some floors and the original two-apartment split on others — worth mapping, with the sign-offs, before you compare prices.
Building operations
Underlying mortgage — the key date is December 1, 2029. Per the audited 2020 statements, the corporation refinanced in November 2019 with a $3.25 million first mortgage from a savings bank. The loan is interest-only at a rate just over 3 percent, with a ten-year term maturing December 1, 2029. Interest-only means no principal is being paid down, so the full $3.25 million will need to be refinanced or repaid at maturity, at whatever rates apply then. The corporation also has a $500,000 line of credit maturing on the same date, at a floating rate with a 5 percent floor; $65,000 was drawn at the end of 2020. Ask the managing agent for the current balance on the line and what the board plans for 2029.
Reserves and assessments. Cash reserves were under $150,000 at year-end 2020, and the corporation levied special assessments that year. The statements note that no reserve study has been done and that major repairs will be funded from reserves, assessments, the credit line or deferral. Ask for the latest statements, the current reserve balance and whether any assessment is in place.
Capital work. In 1997 the corporation carried out a full Local Law 10 façade program (the predecessor of today's Local Law 11 five-year exterior inspection): repointing the north façade, rebuilding the corners from the third floor up, resealing the terra-cotta and cleaning the façade, financed through a 1997 refinancing, per the board newsletter on file. Department of Buildings records show further façade restoration in 2003 and 2007, brick replacement and terra-cotta repair in 2012, domestic water riser replacements in 2016–17, and façade and roof repairs filed in 2019. Ask for the current Local Law 11 report.
Taxes. J-51 is a city program that reduces real estate taxes for qualifying renovation work. A 1991 abatement on $48,500 of work ran through 2001/02, and a 2000 abatement on $65,400 of work was used up in 2010/11. Neither is active, and there is no scheduled burn-off to plan for. The co-op abatement continues for apartments that are a shareholder's primary residence.
Monthly carrying charges in recent sales
- Maintenance, per room
- $522 per room a monthMedian of 3 recorded sales since October 2023Source: recorded sales, refreshed October 2026
Maintenance as recorded with each sale. A co-op's maintenance already covers the building's real estate taxes and the building's own mortgage, if it has one; add your own loan payment for the monthly outlay. A summary of recorded sales, not a current bill; charges change.
Building staffing and amenities
- Doorman
- Full-time doormanSource: recent listing records
- Elevator
- YesSource: NYC Department of City Planning records (PLUTO)
Staffing and amenities as our building profile and recent listing records describe them. A feature not listed is not confirmed absent. Outdoor space, parking and some facilities can belong to particular apartments or to a separate owner; confirm access for the specific apartment.
Local Law 97
- 2024–2029 annual penalty
- $0 (under cap)
- 2030–2034 annual penalty
- $4,877/yr
- Per unit / month range
- $0 – $13
- Modeled exposure split equally across 32 units (the residential count on the city's lot record). Not an assessed amount; co-op shareholders are typically charged by share allocation.
Source: NYC LL84 benchmarking and PLUTO · The Roebling Research Library. City data last refreshed October 2026.
See full Local Law 97 analysis — emissions history, scenarios, methodology →Facade safety — Local Law 11
The latest available FISP filing classified the facade as Safe — no repairs were required at that inspection. A filed Safe grade is not a guarantee of current condition: owners still maintain the facade and, where required, observe parapets each year. Future inspection timing (Local Law 49 of 2025 changed the cycle framework from October 1, 2026), repair and any assessment decisions remain building-specific.
How to read this, and where it comes from
QEWI = Qualified Exterior Wall Inspector — a licensed professional engineer or registered architect who meets DOB’s FISP qualifications and signs the report (the independent expert, not the managing agent).
Penalties shown are amounts DOB assessed against filings on record across 2005–10 to 2020–25. The FISP dataset does not record whether they were paid, contested or remain open, so treat the figure as history rather than a current balance and confirm the building’s standing with the managing agent.
Source: NYC DOB facade filings (FISP) · The Roebling Research Library. City data last refreshed October 2026.
Recent sales
Recent transfers at this building, from The Roebling Research Library. Prices are the transfer amounts recorded with the NYC Department of Finance; apartment-level detail is checked against the building’s own file in The Roebling Research Library before publishing.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Jun 12, 2026 | 12B | 2 BR · 1.5 BA · 1,100 sf | $2,100,000 | $1,909/sf | +13.5% |
| Mar 28, 2024 | 6B | 1 BR · 1 BA | $725,000 | -3.3% | |
| Feb 14, 2024 | 9B | 1 BR · 1 BA | $725,000 | -3.3% | |
| Feb 14, 2022 | 4B | 2 BR · 1 BA | $1,800,000 | +6.2% | |
| Dec 7, 2021 | 1A | 2 BR · 2 BA | $552,000 | -38.6% | |
| Nov 18, 2021 | 14AB | 4 BR · 3 BA · 2,800 sf | $3,950,000 | $1,411/sf | -6.0% |
| Jan 26, 2021 | 7AB | 6 BR · 5 BA · 2,710 sf | $2,400,000 | $886/sf | -7.7% |
| Mar 7, 2019 | 5B | 1 BR · 1 BA | $675,000 | -14.6% |
Market read. Most recent trades (2026 to date) cleared a median $1,909/sf (recorded) across 1 sale. Median listing discount 2.6% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Full closing history with price-per-square-foot over time, the complete retrade record, and every line that has traded.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-01072-0040). Apartment-level facts (line, condition, asking-price context) curated and cross-verified in The Roebling Research Library. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price; square footage on co-ops is not officially recorded, figures shown are approximate.
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What to know if you’re buying
Underwrite the 2029 refinancing. The mortgage is interest-only and matures December 1, 2029. If rates are higher then, the interest cost in the maintenance will rise. Ask the board how it plans to handle it.
Check reserves and assessments. Reserves were thin at the end of 2020 and the corporation assessed shareholders that year. Get the current numbers.
Ask for the policy stack. The corporation has a flip tax, and the board must consent to any share loan. Financing limits, subletting, pets and washer/dryer rules have to come from the managing agent.
Map your apartment's layout. With combinations on several floors, confirm the room count, share allocation and alteration history for the specific apartment.
What to know if you’re selling
Lead with the view and the floor. A park-facing apartment in a 1928 tower is the main selling point. Say which floor and which exposures first.
Have the finances ready. Buyers and their lenders will ask about the 2029 maturity. A clear answer from the board on the refinancing plan helps the deal.
Price by layout. Full-floor combinations, original seven- and six-room apartments and the smaller companion apartments are separate products. Use comparable sales from the same layout.
Comparable buildings
If you're considering 27 Prospect Park West, also evaluate:
- 9 Prospect Park West — the 1929 fifteen-story park-front co-op at President Street, credited to the same developer; also outside the district
- 35 Prospect Park West — Emery Roth's 1929 co-op at Garfield Place, with the avenue's largest apartments
- 40 Prospect Park West — the 1942 park-front co-op at Garfield Place; also excluded from the district
- 125 Prospect Park West — Harry Moore's 1916 six-story co-op at 8th Street, inside the district
- 86 Prospect Park West — the 1908–09 walk-up co-op at 4th Street, inside the district
- 1 Plaza Street West — Sugarman & Berger's sixteen-story 1927 co-op on Grand Army Plaza
- 39 Plaza Street West — Rosario Candela's 1926 Berkeley Plaza Apartments on Grand Army Plaza
- 90 Eighth Avenue — Sugarman & Berger's 1927 eleven-story co-op at President Street, inside the district
More Park Slope buildings
- 267–269 8th Street, 267 and 269 8th Street — 2008 condominium
- 267–273 1st Street — 2003 condominium
- 269 4th Avenue (Six Garfield), 269 Fourth Avenue — condominium
- 270 14th Street — 2024 condominium
- 270 Fifth Street (The Milk Factory) — co-op
- 275 Sixth Avenue — 1920 condominium
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.
Considering a move at 27 Prospect Park West?
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646.939.7375 · c.cohen@compass.com