- Year built
- 1913
- Type
- Cooperative
- Units
- 13
- Floors
- 12
- Landmark
- Designated
640 Park Avenue is one of the earliest J.E.R. Carpenter commissions on Park Avenue and among the most architecturally significant pre-1920 cooperatives on the corridor. Built in 1913–1914 by Spencer Fullerton Weaver — a UPenn-trained civil engineer who would later partner in the hotel architecture firm Schultze & Weaver — the building replaced six row houses on the northwest corner of Park Avenue and East 66th Street.
Carpenter is the architect most associated with the development of the modern large Park Avenue apartment house. The Real Estate Record and Guide described him in his lifetime as "the father of the modern large apartment" in New York City. His Park Avenue and Fifth Avenue work spans approximately three decades and includes 580, 610 (the Mayfair), 825, 845, 907, and 1148 Park Avenue, plus 907, 920, 950, 1115, and 1120 Fifth Avenue. 640 Park, completed in 1914, sits at the beginning of this body of work — among Carpenter's earliest Park Avenue commissions and one of the buildings that established the architectural vocabulary the corridor would adopt across the 1920s pre-war boom.
The building's structural distinction is its single-apartment-per-floor configuration: 13 apartments across 12 stories, with each apartment occupying a full floor. This is among the most intimate residential configurations on Park Avenue and produces apartments with multi-exposure layouts, formal entry galleries, and the architectural fabric characteristic of the pre-WWI Park Avenue luxury cooperative tradition.
The 1946 cooperative conversion places 640 Park among the earliest Park Avenue conversions of the post-war era.
Architecture and unit composition
The 13 apartments distribute one per floor across the building's 12 stories. Apartment layouts retain the architectural fabric characteristic of Carpenter's pre-WWI Park Avenue work — substantial ceiling heights, formal entry galleries, library-living combinations, multi-exposure layouts with Park Avenue and East 66th Street frontages, and the staff-wing infrastructure characteristic of 1914-vintage luxury Park Avenue construction.
CityRealty's editorial coverage references full-floor apartments asking up to approximately $25 million, indicating the upper-floor inventory's positioning in the Park Avenue trophy cooperative tier.
Building operations
640 Park operates as a small-scale cooperative with full-time doorman and concierge service. The building does not carry an on-site garage, fitness center, or roof deck — the amenity infrastructure is calibrated to the pre-WWI Park Avenue cooperative tradition rather than to contemporary luxury condominium specifications. CityRealty assigns the building a rating of 83.
The 13-apartment scale produces an institutional cooperative culture characteristic of the corridor's smallest peer buildings.
What to know if you’re buying
The 13-apartment scale is among the smallest on Park Avenue. The institutional cooperative culture, the rigorous board approval framework, and the limited inventory turnover that the small scale produces are structural features of the building and should be understood at the start of any prospective transaction.
The Carpenter architectural pedigree is real and structural. One of the earliest of Carpenter's Park Avenue commissions; the building's architectural vocabulary established conventions the corridor adopted across the subsequent two decades.
Full-floor apartment configuration is the building's structural feature. Buyers should evaluate apartments on the basis of their full-floor layout, multi-exposure conditions, and the architectural specifics of Carpenter's 1914 design.
Confirm policy specifics during due diligence. Down payment, financing, flip tax, pet, pied-à-terre, and sublet policies should be verified against current management documents. CityRealty's published 20 percent minimum down figure is unusually permissive for a building of this caliber and should be verified directly.
The 1946 cooperative conversion places the building among the earliest Park Avenue conversions. The deep cooperative history produces a building culture continuously refined for nearly 80 years.
What to know if you’re selling
Marketing should emphasize the Carpenter architectural credential and the full-floor apartment configuration. Both are structural identity features; the combination supports trophy-tier pricing positioning.
Pricing requires apartment-level comparable analysis on a 13-unit base. Thin transaction inventory means each closing carries meaningful weight in the building's reference pricing.
Closing timelines are cooperative-standard. Plan for 6–10 weeks from contract through board approval to closing.
Comparable buildings
If you're considering 640 Park Avenue, also evaluate:
- 610 Park Avenue (The Mayfair) — Carpenter 1925 hotel converted to condominium 1997–98; one block south; condominium rather than cooperative
- 720 Park Avenue — Candela 1929; nearby Lenox Hill peer at trophy tier
- 740 Park Avenue — Candela / Cross & Cross 1929–30; trophy cooperative
- 755 Park Avenue — Rouse & Goldstone 1914; same vintage Park Avenue peer
- 820 Fifth Avenue — McKim, Mead & White 1916; comparable pre-WWI Fifth Avenue trophy peer
- 998 Fifth Avenue — McKim, Mead & White 1912; pre-WWI Fifth Avenue peer
The Roebling Team at 640 Park
The Roebling Team at Compass specializes in Central Park West, the Upper East Side, and the broader Park-facing Manhattan market. We publish this building profile because Park Avenue Lenox Hill buyers and sellers deserve building-specific intelligence — architectural attribution, board context, and the realities of pricing at the apartment level — not generic market commentary.
If you're considering a purchase or sale at 640 Park, a 30-minute consultation is the right starting point.