45 Plaza Street West
45 Plaza Street West, at Union Street, Park Slope, Brooklyn
BBL 3010640021 · BIN 3024626
- Year built
- 1941
- Type
- Cooperative
- Floors
- 6
- Landmark
- Designated
- Amenities
- Elevator, live-in superintendent, shared gardens, common laundry, bicycle room and storage
Every recorded sale at this building, 2004–2026
Bedroom-by-bedroom medians, the full transfer record, and how units trade against ask.
- 1BR median
- $950K
- Recent range
- $765K – $2.1M
- Listing discount
- -7.2%
- Recorded transfers
- 34
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45 Plaza Street West is a 1941 Moderne apartment house on an angled site near Grand Army Plaza. The six-story building reaches from Plaza Street West to Union Street, with shared gardens and apartments whose orientations follow the unusual footprint. LPC included it in the Park Slope Historic District Extension II in 2016.
Its construction belongs to a later chapter of Park Slope's development. LPC connects the area's additional apartment-house construction in this period to the transportation improvements of the 1930s. The building's restrained Moderne character sits within a district better known for earlier residential architecture.
The setting brings several major public spaces close together: Grand Army Plaza, the entrance to Prospect Park and the central library. The building itself supplies a more private form of outdoor space through its shared garden areas, and some apartments have balconies overlooking the plaza or neighborhood.
Architecture and unit composition
LPC classifies the building as Moderne. Its six-story mass and angled footprint create a different apartment arrangement from a narrow mid-block building. Homes occupy plaza-facing, Union Street and inward-facing positions, with some layouts taking light from more than one direction.
The inventory includes large one-bedroom apartments, two-bedroom homes and combinations. Entry foyers, separate dining areas, windowed bathrooms and numerous closets recur in the plans. Some one-bedroom homes approach the interior area of a small two-bedroom apartment elsewhere, with recorded examples around 950 to 975 square feet.
Upper-floor apartments can have treetop outlooks toward the plaza. Balconies occur in part of the inventory, and a combined top-floor residence has traded with a larger multi-room layout and outdoor space. Those homes form a distinct category from the smaller inward-facing apartments.
The shared gardens give the building both a landscaped street edge and an internal outdoor amenity. The inner garden includes seating and dining areas. An apartment looking into that space has a different exposure from a plaza-facing home, even though both benefit from the same location.
The building's historic-district status covers its exterior character. LPC's designation is attached to this property, not merely to the nearby brownstone blocks. Exterior alterations therefore take place within the district's preservation framework.
Building operations
A live-in superintendent supports the cooperative's daily operations. Common laundry, bicycle storage and additional storage supplement the elevator and shared outdoor areas. The garden's seating, planting and dining use create an amenity at ground level that does not require a private terrace.
The property consists of one cooperative with multiple street addresses. The Plaza Street West and Union Street frontages belong to the same building. Its tax lot is in Class 2, and there is no current building-wide abatement. Apartment carrying costs therefore include the cooperative's ordinary property-tax obligations through maintenance.
PLUTO shows a built FAR below the district's stated residential allowance. The building is also inside a designated historic district; the zoning figure alone doesn't mean an addition would be permitted. Any change to its exterior form would have to account for that landmark context.
The public-facing portions of this angled corner property are part of its operating responsibilities. The multiple frontages and gardens are features of the cooperative as a whole, while any private balcony belongs to the particular apartment's configuration. An interior-facing home and a plaza-facing home share those common obligations.
Recent sales
Recent transfers at this building, curated by The Roebling Team research desk. 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 |
|---|---|---|---|---|---|
| May 27, 2026 | 1F | 2 BR · 1 BA | $1,045,000 | +7.2% | |
| Mar 12, 2026 | 5A | 1 BR · 1 BA · 975 sf | $985,000 | $1,010/sf | +9.4% |
| Mar 9, 2026 | 1D | 1 BR · 1 BA · 950 sf | $765,000 | $805/sf | +2.1% |
| Feb 4, 2025 | 5B | 1 BR · 1 BA | $950,000 | +18.9% | |
| Jan 23, 2023 | 6AB | 3 BR · 2 BA | $2,125,000 | -5.6% | |
| Aug 2, 2022 | 6D | 2 BR · 1.5 BA | $1,150,000 | +0.0% | |
| Aug 3, 2021 | 1F | 2 BR · 1 BA | $898,000 | -4.0% | |
| May 3, 2021 | 2A | 2 BR · 1 BA | $1,150,000 | +0.0% |
Market read. Most recent trades (2026) cleared a median $908/sf across 2 sales. Median listing discount 0.0% from the last ask.
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 3-01064-0021) 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; square footage on co-ops is not officially recorded, figures shown are approximate.
At the recent median sale of $985K (4 transfers since 2024), a buyer putting 25% down would pay about $12,244 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: $12,244
Assumes a resale (the seller pays transfer taxes), a $4,500 attorney fee and a mortgage on the rest.
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Comparable buildings
- 40 Prospect Park West — An apartment-house cooperative from the same early-1940s period, with a similar mid-rise form and park-oriented setting.
- 225 Park Place — A cooperative of similar era and scale for buyers comparing large apartment-house plans in the surrounding neighborhood.
- 20 Plaza Street East — A larger cooperative from the same broad period on the opposite side of Grand Army Plaza.
- 39 Plaza Street West — A nearby prewar cooperative with a similar residential count in a much taller building.
- 235 Lincoln Place — A late-1930s cooperative with a comparable low-rise scale and an interior-block setting.
More Park Slope buildings
- 444 12th Street (Ansonia Muse) — 1881 condominium
- 445 5th Avenue (The Slope on Fifth), 445 Fifth Avenue — 2025 condominium
- 445 First Street — 1931 co-op
- 450 3rd Street — 1940 co-op
- 452 12th Street — 1986 condominium
- 457 First Street, 457 First Street · Park Slope — 1940 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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