900 Park Avenue (The Park 900)
900 Park Avenue, New York, NY 10075
- Year built
- 1973
- Type
- Condominium — one of the few condominiums on Park Avenue, an avenue otherwise dominated by pre-war cooperatives
- Units
- 124
- Floors
- 28
- Landmark
- No
- Pets
- Cats and dogs permitted per listing records
Every recorded sale at this building, 2023–2026
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Recorded sales
- 25
- On record
- 2023–2026
900 Park Avenue is a structural anomaly on the avenue, twice over. First, the height: completed in 1973 to Philip Birnbaum's design for Jack Resnick & Sons, it was one of two towers (with 733 Park) that significantly pierced Park Avenue's traditional cornice line in the 1970s — controversial enough at the time that the city's Special Park Improvement District zoning followed, capping heights on upper Park Avenue and guaranteeing that nothing like it can be built on the avenue again. The criticism was real and is part of the record: The New York Times's architecture critics attacked the tower's break with the avenue's building wall, and a 1974 Times editorial needled the placement of a Henry Moore sculpture in its plaza as "throwing good art after a bad building." Fifty years on, the practical consequence has inverted the critique — the building's upper floors hold protected, high-elevation Park Avenue views at a height the zoning that followed it now forbids.
Second, and more important to buyers today: 900 Park is a condominium on an avenue of co-ops. The 1979 conversion — sponsor Park Lasalle, Inc.; offering plan and amendments on file in The Roebling Research Library — was itself contentious, drawing lawsuits over the converter's tactics that The New York Times covered in March 1980, but the result is one of a small handful of true condominium alternatives in the heart of the Park Avenue corridor. For foreign buyers, trusts and LLC structures, pied-à-terre intent, and anyone unwilling to undergo a co-op board's financial proctology, the building occupies a genuinely scarce position: Park Avenue address, 79th Street crossing, condominium mechanics.
The site has its own history. The tower replaced one of the last great corner mansions on the avenue — the 1917 John Sherman Hoyt house by John Mead Howells and I.N. Phelps Stokes, a loss architectural historian Christopher Gray revisited in The New York Times in 2012. And the building's plaza has carried an improbably distinguished sequence of sculpture: the Moore, then Zúñiga's "Four Generations" (removed to the plaza from St. Bartholomew's courtyard), and finally the bronze Botero cat — fitting, since Fernando Botero himself lived and painted in the building for decades.
Architecture and unit composition
Birnbaum was the most prolific apartment-tower architect of his era, and architectural records treat 900 Park as a definite upgrade on his stereotype — limestone cladding with a vertical emphasis, rounded-top-and-bottom window bays at the south and east corners, the deep landscaped plaza, and the Jay Spectre Modernist lobby behind large glass. The 124 residences distribute across 28 floors in lines running from one-bedrooms with dining alcoves through high-floor two- and three-bedroom corners; the A-line three-bedrooms carry 30-foot living rooms, and full-floor combinations exist — most famously the 22nd floor, which Botero assembled into a single residence and studio. Corner exposures above the neighboring cornice line take Central Park views to the west and protected Park Avenue vistas south down the avenue; the 79th Street crossing keeps the lower-floor outlook open as well.
Building operations
Full-service condominium: 24-hour doorman, concierge, attended elevators — a service signature more common in co-ops than condos of this vintage — plus live-in superintendent, fitness center, bike room, laundry, and the on-site garage. The private driveway and below-grade plaza give the building an arrival sequence unique on the avenue. In-unit washer/dryers appear throughout recent listings. The offering plan and amendments are on file in The Roebling Research Library; current by-laws, financials, and house rules should be reviewed with counsel at offer stage.
Local Law 97
- 2024–2029 annual penalty
- $0 (under cap)
- 2030–2034 annual penalty
- $10,666/yr
- Per unit / month range
- $0 – $7
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 closings 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 |
|---|---|---|
| Feb 10, 2026 | CUC | $1,643,741.01 |
| Feb 10, 2026 | CUB | $6,356,285.99 |
| Dec 11, 2025 | 3B | $6,600,000 |
| Nov 28, 2025 | — | $38,000,000 |
| Dec 10, 2025 | — | $13,700,000 |
| Oct 27, 2025 | 12 | $16,250,000 |
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 1-01491-7501) 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.
What to know if you’re buying
The condo structure is the headline. No board interview, no co-op-style financial disclosure to neighbors, and a policy framework that accommodates pieds-à-terre, trusts, LLCs, and international buyers far more readily than the surrounding avenue inventory. Confirm the right-of-first-refusal mechanics and any structure-specific requirements with the managing agent and your attorney.
The height is now an asset the zoning protects. The Special Park Improvement District means the building's elevation cannot be replicated on upper Park Avenue. Upper-floor views — park to the west, the avenue's open spine to the south — carry structural permanence that should be priced into line selection.
Underwrite the 1979 conversion documents, not folklore. The conversion era was litigious, and the offering plan plus amendments (on file with us) remain the governing documents for unit boundaries, common elements, and the commercial components. Your attorney should review them alongside current financials.
Attended elevators cut both ways. They are a genuine service luxury and a staffing cost; compare common charges against peer condos with leaner staffing using the True Monthly Carrying Cost Calculator.
Mansion tax applies at most price points here. Run the Mansion Tax Calculator at your target number before you structure an offer.
What to know if you’re selling
Market the scarcity, by name. "Condominium on Park Avenue" is the thesis — your buyer pool includes everyone the avenue's co-op boards screen out: international buyers, LLC and trust purchasers, pied-à-terre buyers, and parents buying for children. Position against the co-ops' policy stack explicitly.
Anchor to line-specific history. The spread between high-floor corners and low mid-block lines is wide, and the building's average is not a useful anchor. Same-line and same-tier comparables — which we maintain in the Research Library — are.
Lead with the arrival sequence and the service model. The driveway, the plaza and its Botero, the Spectre lobby, and attended elevators photograph and show better than the building's exterior reputation suggests. Let the entrance do the first showing.
Comparable buildings
If you're considering 900 Park Avenue, also evaluate:
- 733 Park Avenue — the other 1970s tower that pierced the avenue's cornice line; the closest structural sibling
- 520 Park Avenue — Robert A.M. Stern's limestone condominium tower; the trophy-tier condo alternative on the avenue
- 535 Park Avenue — boutique condo alternative further south on the avenue
- 1010 Park Avenue — pre-war converted condominium alternative in Carnegie Hill
- 1049 Fifth Avenue — pre-war-envelope condominium on Museum Mile; the same no-board thesis, park-facing
- The Bellemont (1165 Madison) — new-development boutique condo alternative nearby
- 888 Park Avenue and 895 Park Avenue — the immediate pre-war co-op neighbors; the traditional alternative with the stricter framework
- 930 Park Avenue — pre-war co-op peer two blocks north
The Roebling Team at The Park 900
The Roebling Team at Compass works the Park Avenue corridor and the broader Upper East Side as a core practice area. We publish this building profile because 900 Park Avenue buyers and sellers deserve building-specific intelligence — conversion documentation, condo-versus-co-op structural analysis, and corridor comparables — not generic neighborhood commentary.
If you're considering a transaction at 900 Park Avenue, a 30-minute consultation is the right starting point.