840 Park Avenue
840 Park Avenue, New York, NY 10075
BBL 1013910034 · BIN 1041800
- Year built
- 1912
- Type
- Cooperative
- Units
- 18
- Floors
- 12
- Landmark status
- Not an individual landmark; in the Upper East Side Historic District
- NYC Landmarks Preservation Commission records, updated February 2026
- Subletting by shareholders
- Permitted with conditions
- Pied-à-terre
- Permitted with conditions
- Doorman
- Full-time doorman
Every recorded sale at this building, 2006–2026
Bedroom-by-bedroom medians, the full transfer record, and how units trade against ask.
- 3BR median, 2025–2026
- $4M
- 2 qualifying sales
- Recent range
- $3.9M – $9.1M
- Listing discount
- 5.6%
- Recorded transfers
- 24
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.
840 Park Avenue is among the most architecturally accomplished of the George and Edward Blum brothers' Park Avenue commissions — the 1911–12 building represents the firm's pre-WWI vocabulary. 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 1910 to 1926. 840 Park sits early in that span.
The 1911–12 date produces a particular set of architectural characteristics. The building follows the firm's 830 Park (1910–11) by about a year and precedes their 1920s commissions (1075 Park: 1921–22; 940 Park: 1925–26) by a decade. 840 Park reflects the Blum brothers' apartment-design discipline in its pre-WWI form — refined floor plates, classical detailing executed with the firm's signature decorative facade vocabulary, mechanical systems and apartment configurations that reflect pre-WWI 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 18-apartment scale (built for eighteen families) places 840 Park among the smaller pre-WWI Park Avenue cooperatives, but the count does not establish turnover; review dated transfers.
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, both executed by the same firm in 1911–12, represent a cohesive architectural argument on the corridor. The broader pre-war Park Avenue tier-one inventory — 740 Park (Candela 1929–30) and 778 Park (Candela 1929–31) several blocks south, 1040 Park (Delano & Aldrich 1923–24) to the north — 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, 18-apartment scale with turnover to establish from dated transfers, and prices to compare with 740, 778 or 720 Park using matched sales and reliable apartment measurements.
Architecture and unit composition
The 18 apartments span a range of configurations up to 4–5 BR layouts across the 12 stories; confirm the current apartment schedule and any combinations with the managing agent. The building's most architecturally distinctive apartments are the upper-floor full-floor configurations and the corner residences.
The described interior features include formal entry galleries, library-living combinations, primary suites with substantial closets and service wings. Verify those features and ceiling heights in the specific residence; authorship and date alone do not establish uniform 10–11-foot ceilings or a comparison with Candela buildings.
Park Avenue-facing apartments look across the median plantings and the buildings opposite. 76th Street-facing apartments have southern cross-street exposures; actual views depend on the apartment.
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 18-apartment scale keeps the building's population small.
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.
Sublet and pied-à-terre policy
A condominium owner leasing a unit and a co-op shareholder subletting are different rules, and a building-wide rule is different from a restriction on one apartment. This is the building's rule; confirm it for the specific apartment.
- Subletting by shareholders
- Permitted with conditionsRestrictedSource: The Roebling Team's building profile
- Pied-à-terre ownership
- Permitted with conditionsCase by case, board discretionSource: The Roebling Team's building profile
Considering an apartment here? Send Corey the listing to discuss the sublet and pied-à-terre rules for that apartment.
Own an apartment here? Request an apartment-specific pricing review.
Monthly carrying charges in recent sales
- Maintenance, per room
- $1,225 per room a monthMedian of 3 recorded sales since October 2023Source: recorded sales, refreshed October 2026
Maintenance as recorded with each sale. A co-op's maintenance already covers the building's real estate taxes and the building's own mortgage, if it has one; add your own loan payment for the monthly outlay. A summary of recorded sales, not a current bill; charges change.
Building staffing and amenities
- Doorman
- Full-time doormanSource: The Roebling Team's building profile
- Live-in superintendent
- YesSource: The Roebling Team's building profile
- Elevator
- YesSource: NYC Department of City Planning records (PLUTO)
- Amenities noted
- StorageSource: The Roebling Team's building profile
Staffing and amenities as our building profile and recent listing records describe them. A feature not listed is not confirmed absent. Outdoor space, parking and some facilities can belong to particular apartments or to a separate owner; confirm access for the specific apartment.
Facade safety — Local Law 11
The latest available filing classified the facade as SWARMP — Safe With A Repair and Maintenance Program: the inspector (QEWI) identified conditions requiring monitoring or repair, with repairs due by the deadline stated in the filing. The scope, timeline, and how the building funds the work are building-specific — we review the filings and board materials for you.
How to read this, and where it comes from
QEWI = Qualified Exterior Wall Inspector — a licensed professional engineer or registered architect who meets DOB’s FISP qualifications and signs the report (the independent expert, not the managing agent).
Source: NYC DOB facade filings (FISP) · The Roebling Research Library. City data last refreshed October 2026.
Recent sales
Recent transfers at this building, from The Roebling Research Library. Prices are the transfer amounts recorded with the NYC Department of Finance; apartment-level detail is checked against the building’s own file in The Roebling Research Library before publishing.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Aug 6, 2026 | 5B | 3 BR · 3.5 BA · 2,022 sf | $4,050,000 | $2,003/sf | -4.7% |
| 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 | — |
Market read. Most recent trades (2026 to date) cleared a median $2,003/sf (recorded) across 1 sale. Median listing discount 11.0% 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). Apartment-level facts (line, condition, asking-price context) curated and cross-verified in The Roebling Research Library. 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 would your apartment rent for?
Enter your apartment and I'll send you what it would rent for, from comparable closed leases at 840 Park Avenue and nearby.
At the recent median sale of $4.05M (3 transfers in the past 24 months, since November 12, 2024), a buyer putting 25% down would pay about $75,300 to close, or 1.9% of the price.
- Mansion tax: $60,750
- No mortgage recording tax or title insurance on a co-op purchase
- Attorneys, lender, building fees and filings: $14,550
Assumes a resale (the seller pays transfer taxes), a $4,500 attorney fee and a mortgage on the rest.
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What to know if you’re buying
The pre-WWI vintage is structural. The 1911–12 vintage produces ceilings and floor plates of the era; ask which mechanical systems have been modernized and when. 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.
Compare actual prices with Candela-designed alternatives. Use matched sales, reliable apartment measurements and total carrying costs before assigning a price discount to 840 Park.
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 criteria are building-specific. Confirm the building's current financing, liquidity, ownership, occupancy and subletting requirements from its governing documents and application instructions.
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 1911–12 date within the firm's pre-WWI work.
Pricing requires apartment-level comparable analysis. Floor altitude, exposure, configuration, and renovation history all matter substantially.
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 1910–11; nearby, a year earlier
- 1075 Park Avenue — Blum brothers; later vintage from same firm
- 740 Park Avenue — Candela 1929–30; the Gold Coast apex
- 778 Park Avenue — Candela 1931; 18 full-floor apartments
- 730 Park Avenue — Lafayette Goldstone 1929; nearby tier-one peer
More Park Avenue buildings
- 823 Park Avenue (The Parkville) — 1911 condominium by Pickering & Walker
- 829 Park Avenue — 1910 co-op by Pickering & Walker
- 830 Park Avenue — 1910 co-op by George and Edward Blum
- 850 Park Avenue — 1914 co-op by Rouse & Goldstone
- 860 Park Avenue — 1924 co-op by York & Sawyer
- 865 Park Avenue — 1907 co-op
The neighborhood
For the full corridor — architecture, 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.
How to read the facts on this page. Items attributed to an offering plan describe the building as it was offered at that filing — unit mix, square footage, the amenity program as planned. They are not a statement about how the building operates today. Tax and compliance figures are sourced separately to current City records and carry their own dates. House rules, staffing and fee policy can change by board resolution without any public filing: treat every policy line here as a starting point for diligence and confirm it with the managing agent. Where this page compares one building or neighborhood to another, that is our analysis of the recorded record — it names the measure, the period and the sample it rests on, and it is an observation about medians rather than a prediction about any particular apartment.
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.
646.939.7375 · c.cohen@compass.com