817 Fifth Avenue
817 Fifth Avenue, New York, NY 10065
BBL 1013777501 · BIN 1040922
- Year built
- 1925
- Type
- Cooperative
- Units
- 16
- Floors
- 14
- Pets
- Subject to board approval and house rules
- Subletting
- Restricted under cooperative rules; board approval required
Every recorded sale at this building, 2005–2023
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf
- $3,180
- Listing discount
- 10.7%
- Recorded sales
- 6
- On record
- 2005–2023
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 817 Fifth 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.
817 Fifth Avenue is one of the most exclusive full-floor cooperatives on Fifth Avenue — a 1925 Italian Renaissance building by George B. Post & Sons, standing at the corner of East 63rd Street and facing Central Park. It is a building of only 16 residences across its fourteen floors, and the overwhelming majority are full-floor homes, with a maisonette triplex holding its own private entrance. That rarity — a small number of grand, single-floor apartments in a limestone-based palazzo directly on the Park — is precisely what defines the top tier of the Fifth Avenue co-op belt.
The pedigree is real. George B. Post & Sons — successors to the firm behind the New York Stock Exchange and the original Wisconsin State Capitol — designed the building in the neo–Italian Renaissance idiom, with a rusticated limestone base, refined bandcourses, a canopied side-street entrance, and a commanding cornice. The building rose in 1925 on the site of Gilded Age mansions, replacing townhouses that had included a Charles T. Barney residence, and it was converted to cooperative ownership in 1974. Over the decades its apartments have drawn a discreet roster of prominent owners.
The building is for a specific buyer: one who wants a full-floor Central Park home in a white-glove Fifth Avenue cooperative, and who is prepared for the financial scrutiny and primary-residence expectations that come with a building at this level.
Architecture and unit composition
George B. Post & Sons composed 817 Fifth Avenue as a neo–Italian Renaissance palazzo: a four-story rusticated limestone base grounds the façade, bandcourses articulate the shaft, and a substantial cornice crowns the building. The entrance is set on the side street beneath a canopy, in the manner of the finest Fifth Avenue houses, preserving the Park-facing frontage for the residences themselves.
The unit composition is the story. With only 16 residences over fourteen floors, nearly every home is a full floor, laid out with the grand entertaining scale — gallery, corner living rooms, formal dining, and generous private quarters — that Fifth Avenue's best prewar buildings were built to deliver. The maisonette triplex has its own private entrance. Ceiling heights, room proportions, and Central Park frontage are the differentiators here; these are among the largest and most consequential apartments in any building of this size on the avenue.
Building operations
817 Fifth Avenue operates as a white-glove full-service cooperative appropriate to its stature: an attended lobby, doorman and elevator staff, and the discreet, high-touch service that defines the Fifth Avenue co-op belt. With so few residences, the building runs quietly and privately. As with any premier cooperative, financial requirements are stringent — substantial post-closing liquidity, conservative financing limits (often all-cash or near it), and a rigorous board interview are the norm. Buyers should model maintenance, any assessments, and the full carry, and review the building's financials and capital history during due diligence.
Local Law 97
- 2024–2029 annual penalty
- $0 (under cap)
- 2030–2034 annual penalty
- $24,861/yr
- Per unit / month range
- $0 – $129
- Modeled exposure split equally across 16 units (the city tax-lot count). Not an assessed amount; co-op shareholders are typically charged by share allocation.
Source: NYC LL84 benchmarking and PLUTO · The Roebling Research Library. City record last verified September 2026.
See full Local Law 97 analysis — emissions history, scenarios, methodology →Facade safety — Local Law 11
The latest available FISP filing classified the facade as Safe — no repairs were required at that inspection. Facade inspections run on a fixed five-year cycle; future inspection, repair, and any assessment decisions remain building-specific.
How to read this, and where it comes from
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. City record last verified September 2026.
Management & transfer contacts
- Sublet policy
- Allowed; no lease under 2 years, none over 3 years without board approval
- Pied-à-terre
- Not Allowed
- Notable fees
- Application Processing Fee $700 (broker) / $750 (no broker); Closing Doc Prep Fee $500 (seller)
Recent sales
As a cooperative, 817 Fifth Avenue prices on a price-per-room basis rather than strictly per square foot, with floor, Central Park frontage, layout, ceiling height, and condition driving value. Turnover is exceptionally light — full-floor Fifth Avenue apartments in a 16-unit building trade rarely, and each sale is an event. Apartment-level context matters far more than any building average, and the George B. Post & Sons pedigree, the full-floor plans, and the Park views support pricing at the top of the market for residences that present well. Buyers should expect a demanding board process to accompany any purchase.
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 |
|---|---|---|---|---|---|
| Jun 15, 2023 | 9 | 3,450 sf | $12,000,000 | $3,478/sf | off-mkt |
| Jan 12, 2023 | 5 | 5 BR · 4.5 BA · 3,800 sf | $10,950,000 | $2,882/sf | -12.4% |
| Oct 16, 2020 | 5 | 4 BR · 4 BA · 3,800 sf | $9,999,000 | $2,631/sf | -28.3% |
| Apr 13, 2015 | MAIS12 | 5 BR · 5 BA · 5,500 sf | $18,000,000 | $3,273/sf | -9.1% |
Market read. Most recent trades (2023) cleared a median $3,180/sf (recorded) across 2 sales. Median listing discount 10.7% 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 1-01377-7501). 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.
Buying here? Co-op closing costs typically run 2 to 3% of the price. See NYC co-op and condo closing costs, line by line.
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What to know if you’re buying
These are full-floor Park homes. With 16 residences over fourteen floors, nearly every apartment is a full floor facing Central Park — the defining feature and the source of value.
The board process is serious. Expect stringent financial requirements, substantial post-closing liquidity, conservative or all-cash financing expectations, and a rigorous interview.
Cooperative rules govern flexibility. Pied-à-terre use and subletting are generally restricted; primary-residence expectations typically apply. Confirm specifics with the board.
Pricing is per-room, not per-foot. Value tracks floor, Park frontage, room count, ceiling height, and condition rather than a simple square-foot figure.
Mansion tax thresholds apply. At this building's pricing, the higher mansion-tax cliffs are firmly in play. Run pricing through the Mansion Tax Calculator.
Variable board financial policy — confirm at offer stage. Financing limits, liquidity thresholds, and sublet policy should be confirmed in writing before you commit.
What to know if you’re selling
Lead with the full-floor plan and the Park. The full-floor layouts, the Central Park frontage, and the George B. Post & Sons pedigree are the story; marketing should foreground them.
Qualify buyers early. In a building with this board, financial readiness and primary-residence intent should be established before an accepted offer to protect timelines.
Pricing requires apartment-level comps. With so few residences and rare turnover, floor, Park exposure, layout, and condition all move the number.
Comparable buildings
817 Fifth belongs to the pre-war cohort of full-floor cooperatives that defines the avenue along the park — blue-chip architects, exacting boards, apartments measured by the floor. If it's on your list, these belong there too:
- 820 Fifth Avenue — Starrett & Van Vleck, 1916. One of the earliest full-floor apartment houses on the avenue, and among its most rarefied addresses.
- 834 Fifth Avenue — Rosario Candela, 1931. Candela's Fifth Avenue masterwork, long counted among the most prestigious cooperative addresses in the city.
- 825 Fifth Avenue — J.E.R. Carpenter, 1926, by the architect most responsible for the form of the modern Fifth Avenue apartment house.
- 845 Fifth Avenue — another Carpenter building, 1920 — the same planning discipline from a slightly earlier hand.
- 875 Fifth Avenue — Emery Roth, 1941. The cohort's later entry, trading a measure of pre-war ornament for Roth's assured massing at the park's edge.
More Fifth Avenue buildings
- 800 Fifth Avenue — condominium by Robert A.M. Stern Architects
- 810 Fifth Avenue — 1926 co-op by J.E.R. Carpenter
- 812 Fifth Avenue — 1963 co-op
- 820 Fifth Avenue — 1916 co-op by Starrett & Van Vleck
- 825 Fifth Avenue — 1926 co-op by J.E.R. Carpenter
- 834 Fifth Avenue — 1931 co-op by Rosario Candela
The neighborhood
For the full corridor — architecture, transit, and pricing across Fifth Avenue — read The Roebling Team Guide to Fifth 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.
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