640 Park Avenue
640 Park Avenue, New York, NY 10065
Lenox Hill, Upper East Side
BBL 1013810035 · BIN 1041175
- Year built
- 1913
- Type
- Cooperative
- Units
- 13
- Floors
- 12
- Landmark
- Designated
- Financing
- Up to 35% financeable (65% minimum down).
- Subletting
- Not permitted — an owner-occupancy building.
- Pied-à-terre
- Not permitted.
- Washer / dryer
- Permitted in-unit.
- Pets
- Permitted, subject to Board approval.
Compiled by The Roebling Research Desk from the building’s offering plan, amendments, and related building documents (primary source dated 2026). Board policies can change by amendment — confirm at the offer stage.
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.
the architectural record 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. The 13-apartment scale produces an institutional cooperative culture characteristic of the corridor's smallest peer buildings.
Local Law 97
- 2024–2029 annual penalty
- $0 (under cap)
- 2030–2034 annual penalty
- $26,263/yr
- Per unit / month range
- $0 – $182
Facade safety — Local Law 11
The latest available filing classified the facade as SWARMP — Safe With A Repair and Maintenance Program: the engineer identified conditions requiring monitoring or repair before the next inspection cycle. The scope, timeline, and how the building funds the work are building-specific — we review the filings and board materials for you.
QEWI = Qualified Exterior Wall Inspector — the licensed engineer the city requires to sign the report (the independent expert, not the managing agent). Source: NYC DOB facade filings (FISP) · The Roebling Research Library.
See the full facade history →Management & transfer contacts
- Sublet policy
- Not allowed
- Pied-à-terre
- Not allowed
Recent sales
Recent transfers at this building, curated by The Roebling Team research desk. Apartment-level facts are independently verified before publishing; sale prices reflect the recorded transfer amount at the NYC Department of Finance.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Oct 1, 2024 | 3 | 6 BR · 6.5 BA | $13,500,000 | -10.0% | |
| Jul 27, 2018 | 7 | 6 BR · 6.5 BA | $20,000,000 | -13.0% | |
| Jul 18, 2013 | 8 | 5 BR | $23,000,000 | -20.7% | |
| Jun 15, 2011 | 3 | 4 BR | $20,500,000 | -16.3% | |
| Jan 24, 2007 | 11 | 4 BR · 6,200 sf | $21,000,000 | $3,387/sf | -11.6% |
Market read. $/sf is measured on the latest sales with reliable square footage (2007): a median $3,387/sf across 1 sale. The building has traded as recently as 2024. Median listing discount 14.0% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
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 1-01381-0035) 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.
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. public records 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 neighborhood
For the full corridor — architecture, schools, transit, and pricing across Park Avenue — read The Roebling Team Guide to Park Avenue.
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.
Considering a move at 640 Park Avenue?
Request a private building brief with the relevant comparable sales, current and off-market availability, and an apartment-specific view of value.
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 640 Park Avenue 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.