Beekman Mansion
439 East 51st Street, New York, NY 10022
Midtown East
BBL 1013630016 · BIN 1040138
- Year built
- 1925
- Type
- Cooperative
- Landmark
- No
Every recorded sale at this building, 2004–2026
Bedroom-by-bedroom medians, the full transfer record, and how units trade against ask.
- 2BR median
- $942K
- Recent range
- $855K – $4.2M
- Listing discount
- 5.0%
- Recorded transfers
- 43
439 East 51st Street sits at the end of one of Manhattan's most coveted dead-end blocks, where 51st Street narrows toward Peter Detmold Park and the East River. This is the Beekman enclave — a hushed, low-traffic pocket of pre-war cooperatives, diplomatic residences, and townhouses three blocks north of the United Nations, insulated from the noise of Midtown a few avenues west. Beekman Mansion is one of its defining buildings: an impeccably run 1925 cooperative that trades on privacy, proportion, and service.
The architecture rewards a close look. The four-story brick-and-stone base is the building's strongest gesture — fine bas-reliefs at street level, a third-story arcade flanked by pseudo-towers, and five Gothic-arched entryways. The center doors lead to a conventional elevator lobby; the flanking doors open into maisonettes, duplex homes with private street entries. The upper floors are deliberately restrained, letting the base carry the design.
For buyers, the case is straightforward: a small, financially sound white-glove co-op of just 36 apartments, on a quiet riverside block, with the kind of stewardship that pre-war Beekman buildings are known for.
Architecture and unit composition
At 36 residences across 10 stories, Beekman Mansion is intimate by design — a low ratio of apartments to staff that translates into attentive service and a quiet building. The neo-Renaissance façade gives the address its dignity, while the maisonette duplexes at the base are a distinctive feature, offering townhouse-style living with the security and service of a full co-op. Above, the apartments are classic pre-war: gracious room counts, solid construction, and the proportions that buyers seek in this era of the East Side.
Because the building is small, layouts vary, and value is set by floor, light, river or garden orientation, and the quality of each home's most recent renovation. A penthouse or a high-floor home with open exposures toward the river commands a clear premium over a lower interior unit.
Building operations
Beekman Mansion is a white-glove cooperative with a 24-hour doorman, a live-in superintendent, daily hand-delivered mail, a fitness room, central laundry, and private storage when available. The building's policies are owner-friendly within a pre-war framework: pets are welcome, with no breed restriction; pied-à-terre purchases are permitted; financing of up to 80% is allowed; and a 2% flip tax is paid by the seller. Subletting is permitted on a measured basis — generally one year with a renewal option — preserving the building as a primarily owner-occupied community. The cooperative has historically carried healthy finances with no standing assessment.
Local Law 97
- 2024–2029 annual penalty
- $0 (under cap)
- 2030–2034 annual penalty
- $0 (under cap)
- Per unit / month range
- —
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
- Flip tax
- 2% of purchase price, paid by seller
- Sublet policy
- Allowed with board approval; one-year terms only, limited to two years. Sublease renewal fee ~10% of gross monthly rent plus 15% of positive difference over maintenance
- Pied-à-terre
- Allowed
- Notable fees
- Application processing $775; closing fee $725. Max financing 65%
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 |
|---|---|---|---|---|---|
| Apr 9, 2026 | 3D | 2 BR · 1 BA | $855,000 | +0.7% | |
| Jul 1, 2025 | 6C | 2 BR · 1 BA · 1,000 sf | $985,000 | $985/sf | -1.4% |
| Oct 15, 2024 | 3A | 4 BR · 3 BA · 2,200 sf | $1,597,500 | $726/sf | -11.0% |
| Jun 24, 2024 | 9F | 4 BR · 3 BA · 2,100 sf | $1,800,000 | $857/sf | -5.0% |
| May 16, 2024 | 5D | 2 BR · 1 BA | $898,000 | +0.0% | |
| Sep 26, 2023 | 8C | 2 BR · 2 BA · 1,440 sf | $1,250,000 | $868/sf | -15.3% |
| Aug 4, 2023 | 10 | 5 BR · 4 BA | $4,150,000 | -7.7% | |
| Jul 12, 2022 | MAIS441 | 3 BR · 2.5 BA · 2,138 sf | $1,750,000 | $819/sf | -2.8% |
Market read. $/sf is measured on the latest sales with reliable square footage (2025): a median $961/sf across 1 sale. The building has traded as recently as 2026. Median listing discount 4.5% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
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 1-01363-0016) 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
This is a co-op purchase, so a board package and interview are part of the process — plan for it. The building's published posture is buyer-friendly relative to many pre-war peers: up to 80% financing, pied-à-terre ownership allowed, and pets welcome. The 2% seller-paid flip tax is a known cost to factor into resale math. Diligence should focus on the financials, the reserve, any planned capital projects, and the specifics of the apartment — a maisonette duplex and a high-floor simplex are very different propositions. We help buyers read the building, prepare a clean board package, and benchmark the price against true Beekman comparables.
What to know if you’re selling
Scarcity and setting are the story. A home here is sold on the Beekman address, the quiet cul-de-sac, the white-glove service, and the building's financial health — and the comparison set is the small universe of Beekman and Sutton Place pre-war co-ops, not the louder avenues to the west. Maisonette duplexes and high-floor homes with river orientation should be marketed on their distinct character. Pricing to the building's own recent closings and presenting the apartment's pre-war proportions accurately are what produce a strong, efficient sale.
Comparable buildings
If you're considering Beekman Mansion, also evaluate these Beekman and Sutton Place co-ops:
- 433 East 51st Street — a neighboring Beekman co-op
- 420 East 51st Street — a full-service East 51st Street building
- 410 East 52nd Street — a Southgate-area cooperative
- 444 East 52nd Street — Beekman Terrace, a pre-war co-op nearby
- 400 East 51st Street — The Grand Beekman
The neighborhood
For the full corridor — architecture, schools, transit, and pricing across Sutton Place — read The Roebling Team Guide to Sutton Place.
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 Beekman Mansion?
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 Beekman Mansion 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.