840 Park Avenue
840 Park Avenue, New York, NY 10075
Lenox Hill, Upper East Side
BBL 1013910034 · BIN 1041800
- Year built
- 1912
- Type
- Cooperative
- Units
- 38
- Floors
- 12
- Landmark
- Designated
- Subletting
- Restrictive (typical of tier-one Lenox Hill pre-war cooperatives)
Every recorded sale at this building, 2006–2025
Bedroom-by-bedroom medians, the full transfer record, and how units trade against ask.
- 4BR+ median
- $7.7M
- Recent range
- $3.9M – $9.1M
- Listing discount
- 6.5%
- Recorded transfers
- 23
840 Park Avenue is among the most architecturally accomplished of the George and Edward Blum brothers' Park Avenue commissions — the 1916 building represents the firm's mature pre-WWI vocabulary executed at the construction-quality peak of the immediate pre-WWI era. The Blum brothers' Park Avenue portfolio — 555, 591, 830, 840, 875, 940, 1075 Park — represents one of the more cohesive single-firm bodies of work in pre-war Park Avenue inventory, spanning approximately 1909 to 1929. 840 Park sits in the middle of that span.
The 1916 vintage produces a particular set of architectural characteristics. The building is meaningfully later than the firm's earliest Park Avenue work (830 Park: 1909) and earlier than their 1920s commissions (940 Park: 1925; 1075 Park: 1929). The intermediate position means 840 Park reflects the Blum brothers' apartment-design discipline at its mature pre-WWI form — refined floor plates, classical detailing executed with the firm's signature decorative facade vocabulary, mechanical systems and apartment configurations that reflect 1916-era luxury apartment design economics.
The Blum brothers' decorative facade vocabulary is among the building's most distinctive features. Where contemporaneous Carrère & Hastings, McKim Mead & White, and other classical-revival firms produced facades that read in dialogue with the broader European classical tradition, the Blum brothers integrated ornamental detailing — hieroglyphic medallions, Egyptian Revival ornamental elements, Persian and Near Eastern decorative motifs — that distinguished their portfolio from contemporary classical-revival peers. The result at 840 Park is a facade vocabulary that reads as among the more ornamental and decoratively interesting in pre-WWI Park Avenue inventory.
The 38-apartment scale places 840 Park among the mid-sized pre-WWI Park Avenue cooperatives — moderate institutional density and limited annual turnover. The original cooperative ownership produces an institutional culture that has stabilized across more than a century of cooperative occupancy.
The corner positioning at Park Avenue and East 76th Street — immediately south of 875 Park Avenue (Blum brothers 1912, on the southeast corner of Park and 78th) — places 840 Park within a particularly architecturally distinguished short stretch of Lenox Hill Park Avenue. The two buildings, executed by the same firm four years apart, represent a cohesive architectural argument on the corridor. The broader pre-war Park Avenue tier-one inventory — 740 Park (Candela / Cross & Cross 1930) several blocks south, 778 Park (Candela 1931) further north, 1040 Park (Delano & Aldrich 1925) — surrounds the building.
For buyers, 840 Park represents a particular tier of Lenox Hill Park Avenue inventory: pre-WWI architectural pedigree from a distinguished firm with a coherent body of work, 38-apartment scale producing moderate annual turnover, and pricing materially below the Candela apex at 740, 778, or 720 Park.
Architecture and unit composition
The 38 apartments span configurations from approximately 2,000 sf 2BRs to substantially larger 4–5 BR configurations across the 12 stories. The building's most architecturally distinctive apartments are the upper-floor full-floor configurations and the corner residences.
Blum brothers' pre-WWI signatures throughout: 10–11 foot ceilings in primary rooms (consistent with the era's luxury norm; lower than the 1920s Candela peak), formal entry galleries, library-living combinations, primary suites with substantial closet infrastructure, service wings characteristic of 1916-era luxury apartment design.
Park Avenue-facing apartments on the western flank look across to the Park Avenue median plantings and the buildings on the avenue's west side. 76th Street-facing apartments to the south have cross-street exposures with stable residential side-street views.
Building operations
840 Park Avenue operates as a full-service pre-war cooperative with full-time doorman, attended elevator, on-site superintendent, and private storage. The 38-apartment scale produces a moderate institutional density characteristic of pre-WWI Park Avenue cooperative inventory.
Specific policy details (financing posture, flip tax structure, sublet policy specifics, pied-à-terre allowance) should be confirmed directly with property management during due diligence. The board posture follows tier-one Lenox Hill pre-war norms — rigorous financial review, strong personal references, primary-residence intent the working assumption.
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 →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 17, 2025 | 9B | 3 BR · 2.5 BA | $3,930,000 | -1.6% | |
| Nov 21, 2024 | 9 | 4 BR · 6 BA | $6,300,000 | -15.9% | |
| Oct 2, 2024 | 3 | 4 BR · 4.5 BA | $9,115,000 | -6.5% | |
| May 23, 2022 | 12B | 3 BR · 2 BA | $2,600,000 | -13.2% | |
| May 17, 2021 | 5 | 4 BR · 4.5 BA | $8,330,000 | -16.7% | |
| Jan 20, 2021 | 11A | 2 BR · 2.5 BA · 2,400 sf | $2,999,000 | $1,250/sf | -14.2% |
| Sep 11, 2019 | 11A | 2 BR · 2.5 BA · 2,400 sf | $3,100,000 | $1,292/sf | off-mkt |
| Aug 7, 2018 | 8B | 3 BR · 2.5 BA · 2,000 sf | $3,800,000 | $1,900/sf | -11.5% |
Market read. $/sf is measured on the latest sales with reliable square footage (2021): a median $1,250/sf across 1 sale. The building has traded as recently as 2025. Median listing discount 11.3% 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.
Other recent transfers
| Date | Unit | Price |
|---|---|---|
| Nov 24, 2009 | MAIS | $8,750,000 |
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 1-01391-0034) 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 pre-WWI vintage is structural. The 1916 vintage produces ceilings and floor plates of the era; mechanical systems reflect pre-WWI luxury apartment design. Buyers should evaluate specific apartments carefully.
The Blum brothers architectural pedigree is real. Buyers attentive to architectural detail find the firm's distinctive decorative facade vocabulary differentiating among pre-war Park Avenue inventory.
Pricing is more accessible than Candela tier-one peers. 840 Park typically trades at materially more accessible per-square-foot pricing than the 1929–1931 Candela Park Avenue tier-one peak.
Confirm specific policies directly with management. Financing posture, flip tax structure, sublet specifics, and pied-à-terre allowance should be obtained directly during the contract review process.
Board approval follows tier-one Park Avenue norms. Strong financial profile, professional accomplishment, primary-residence intent are central criteria.
Renovation is constrained by historic district status and pre-WWI character. The board reviews scope and quality with attention to preservation of original detail.
What to know if you’re selling
The architectural pedigree is a marketing asset. Listing copy should reference the Blum brothers' authorship, the building's place within the firm's Park Avenue portfolio, and the 1916 vintage's position within the firm's mature pre-WWI work.
Pricing requires apartment-level comparable analysis. Floor altitude, exposure, configuration, and renovation history all matter substantially.
Closing timelines are co-op standard. 6–10 weeks from contract signing to closing.
Comparable buildings
If you're considering 840 Park Avenue, also evaluate:
- 875 Park Avenue — Blum brothers 1912; immediate neighbor north
- 830 Park Avenue — Blum brothers 1909; nearby earlier vintage
- 1075 Park Avenue — Blum brothers; later vintage from same firm
- 740 Park Avenue — Candela / Cross & Cross 1930; the Gold Coast apex
- 778 Park Avenue — Candela 1931; 18 full-floor apartments
- 730 Park Avenue — Lafayette Goldstone 1929; nearby tier-one 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 840 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 840 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.