9 Prospect Park West
9 Prospect Park West, Brooklyn, NY 11215
BBL 3010680037 · BIN 3024821
- Year built
- 1928
- Type
- Cooperative
- Units
- 41
- Floors
- 15
- Landmark
- No
- Amenities
- Laundry room (a new cellar laundry with gas dryers was filed in 2024), bike room, private storage, per listing and DOB records
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 9 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.
9 Prospect Park West is one of the few prewar towers on Park Slope's park frontage, and its history explains why the avenue looks the way it does. The first building on this corner was The Hampton, a six-story Schwartz & Gross apartment house completed in 1903 and described by the Brooklyn Daily Eagle at the time as the latest thing in high-class apartment construction. It was one of the first elevator apartment houses on a street of mansions and rowhouses. In 1928 the developer Samuel Wander, who had just finished a fifteen-story building at 27 Prospect Park West, bought The Hampton, tore it down, and built this fifteen-story tower with a penthouse. It opened in late 1929, just as the Depression began, and historical accounts note that no further high-rise followed it on the avenue.
When the Landmarks Preservation Commission designated the Park Slope Historic District in 1973, it included everything around the building — the rowhouses behind it on President and Carroll Streets, the Eighth Avenue frontage, and the neighboring buildings at 13 to 17 Prospect Park West — but left this lot out. The same is true of other large Prospect Park West apartment buildings, including 1 Prospect Park West, 35 Prospect Park West and 40 Prospect Park West. The result has two sides. The corporation manages its own façade, windows and roof without a Landmarks approval process, which matters for a building that has done major façade work every few years. But the protection that keeps the surrounding block unchanged does not apply to this building.
The cooperative dates from 1978. Punia and Marx, Inc. offered a non-eviction conversion plan on July 31, 1978: 20,000 shares across 41 apartments, a total offering price of $400,000 in cash, and a $700,000 purchase-money mortgage. At the time, 21 of the offered apartments were rent-controlled and 18 were rent-stabilized. Park West Tenants Corp. took title in March 1979. The plan also warned buyers that the building needed a full electrical rewiring, and its own inspecting architect listed the wiring, windows and oil burner as the main items needing work.
Architecture and unit composition
The main entrance is on Prospect Park West. The service entrance and a separate door to one of the doctor's offices are on President Street. The lobby, per the 1977 report, has a faience tile floor, marble base and ornamental plaster ceiling, with the original colonial-style entrance doors. Above the base, the building rises fifteen stories without setbacks to a one-story penthouse set back behind a tiled parapet.
The unit mix follows the original plan. On the lower floors there are three apartments per floor — on the second and third floors, a seven-room and two six-room apartments, each with three baths, and a similar mix on the floors above. On the three top full floors (numbered 14 to 16), there are two apartments per floor, each nine rooms with four or five baths. Two penthouse apartments at the top have large terraces. Room counts in the plan's share schedule and in the architect's report differ slightly; the plan says the schedule controls. Every apartment has access to two means of egress, and the service stair connects to the service elevator and to service doors in each apartment, a feature of prewar park-front buildings.
The park-facing lines have the permanent view east across Prospect Park, and it is the main factor in pricing here. The President Street lines face north across the street over the district's rowhouses, and the upper-floor corner apartments have both exposures.
Building operations
Capital work. Department of Buildings records show a building that keeps up with its façade. Repointing and façade repairs were filed in 2003, 2005 and 2012. Brick, lintel and terra-cotta repairs on the west façade were filed in 2015, masonry rebuilding and stucco in 2020, a steel column replacement in 2020, and a full exterior restoration in 2022–23 covering brick and caulking replacement, lintels, reconstruction of the Juliet balconies, and roofing. In 2024 the corporation filed for a new cellar laundry room with gas dryers.
The ground floor. The 1978 plan left the three professional suites and a lobby unit out of the cooperative offering. Since 2014 the building has been converting that space: an amended certificate of occupancy for two apartments and two doctor's offices on the first floor (temporary certificates issued 2018–2020), and a 2024 filing to convert the last doctor's office to an apartment, with plans approved in 2026. A ground-floor unit was marketed in 2026, per brokerage records. Ask how the corporation allocated shares to these new units and where the sale proceeds went.
Underlying mortgage. Per ACRIS, the corporation consolidated its debt at $3.2 million in 2009, added $1.3 million in 2016, and in December 2022 recorded a $2.15 million new mortgage consolidated into a $6.65 million agreement. That is a substantial amount of debt for 41 shareholders. Ask the managing agent for the rate, the maturity date, whether the loan amortizes, and whether the 2022 money funded the exterior restoration filed that year.
Taxes. The offering plan disclosed a J-51 abatement of $49,800 in total, applied at $4,150 a year for twelve years from 1977/78. The Department of Finance's historical J-51 file shows that award running through 1987, a second abatement starting in 1983 on about $179,800 of work that ran through 1994, and a J-51 exemption starting in 1984 that phased out by 1997. None is active now. The 2021/22–2027/28 exemption roll shows only personal exemptions held by individual shareholders. There is no scheduled burn-off to plan for.
Recent sales
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 |
|---|---|---|
| Jul 27, 2026 | 4A | $2,450,000 |
| Aug 4, 2025 | 15B | $4,343,000 |
| Jun 24, 2025 | 5C | $3,400,000 |
| Mar 22, 2024 | 14A | $3,600,000 |
| Jan 11, 2024 | 8B | $2,300,000 |
| Jul 15, 2022 | 10A | $2,075,000 |
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-01068-0037) 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 $3.4M (3 transfers since 2024), a buyer putting 25% down would pay about $65,550 to close, or 1.9% of the price.
- Mansion tax: $51,000
- No mortgage recording tax or title insurance on a co-op purchase
- Attorneys, lender, building fees and filings: $14,550
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
Ask about the mortgage first. $6.65 million of consolidated debt from 2022 is the biggest unknown on the maintenance line. Get the rate, maturity and amortization before pricing the apartment.
Get the full policy stack. Listing records cite 20 percent down and a 2 percent flip tax, and allow cats. Sublet rules, pied-à-terre and trust or LLC purchases, and the board package all have to come from the managing agent.
Understand what being outside the district means. There is no Landmarks review of the building's exterior — faster and cheaper façade cycles — and no Landmarks protection for the building either.
If you're looking at a ground-floor unit, check its paperwork. Newly converted units need a final certificate of occupancy, a share allocation and a proprietary lease that match. Have your attorney confirm all three.
What to know if you’re selling
Lead with the view. A permanent Prospect Park exposure from a 1929 building is the main selling point. Say which floor and which exposures in the first line.
Price by line and floor. The top-floor nine-room apartments, the mid-floor three-per-floor lines and the penthouses are separate products. Use comparable sales from the same line.
Present the recent capital work. A completed exterior restoration is a selling point with both the board and the buyer's lender. Have the scope and completion status ready, along with the 2022 financing terms.
Comparable buildings
If you're considering 9 Prospect Park West, also evaluate:
- 35 Prospect Park West — Emery Roth's 1929 cooperative at Garfield Place; also outside the district, with the neighborhood's largest apartments
- 40 Prospect Park West — the 1942 park-front co-op at Garfield Place; also excluded from the district
- 1 Prospect Park West — the converted clubhouse condominium on the next block north, across President Street; the condo alternative on the same avenue
- 39 Plaza Street West — Rosario Candela's 1926 Berkeley Plaza Apartments on Grand Army Plaza
- 1 Plaza Street West — Sugarman & Berger's sixteen-story 1927 neo-Gothic cooperative on the Plaza
- 90 Eighth Avenue — Sugarman & Berger's 1927 co-op one block west on President Street, inside the district
- 10 Plaza Street East — the 1959 fifteen-story full-service co-op on the Plaza
- 1 Grand Army Plaza (Richard Meier on Prospect Park) — the new-construction park-front condominium
More Park Slope buildings
- 759 President Street (The Presidential) — 1884 co-op
- 851 Carroll Street — 1894 condop
- 86 Prospect Park West — 1908 co-op
- 90 Eighth Avenue — 1927 co-op by Sugarman & Berger
- 904 Union Street — 1910 co-op
- 910 Union Street (Park Union) — 1931 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.
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