605 Park Avenue
605 Park Avenue, New York, NY 10065
Lenox Hill, Upper East Side
BBL 1013990074 · BIN 1042391
- Year built
- 1954
- Type
- Cooperative
- Units
- 105
- Floors
- 21
- Landmark
- Designated
- Flip tax
- 2% of the sale price.
- Financing
- Up to 75% financeable (25% minimum down).
- Subletting
- Permitted with Board approval. Short-term rentals and AirBnB are not permitted.
- Pied-à-terre
- Permitted.
- Washer / dryer
- Permitted in-unit.
- Pets
- Permitted, subject to Board approval.
- Co-purchasing
- Permitted. Parents purchasing for children not permitted.
- Guarantors
- Not permitted.
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.
Every recorded sale at this building, 2003–2026
Bedroom-by-bedroom medians, the full transfer record, and how units trade against ask.
- 2BR median
- $2M
- Recent range
- $925K – $6.1M
- Listing discount
- 4.0%
- Recorded transfers
- 104
605 Park Avenue is among the substantial post-war white-brick cooperatives that occupy the Lenox Hill Park Avenue corridor alongside the surrounding 1920s pre-war stock. The 1954 Sylvan Bien construction places 605 Park within the post-war Park Avenue building boom — a 1948–1965 era when developers added taller, larger-unit-count buildings to the corridor between the dense pre-war cluster.
Sylvan Bien was a prolific post-war Manhattan apartment architect. His broader portfolio includes 200 East 66th Street and substantial mid-century luxury residential commissions across the Upper East Side. 605 Park is a representative example of the firm's mid-1950s Park Avenue idiom — 21 stories, 105 apartments, white-brick exterior, modular casement windows, and a building scale materially larger than the surrounding pre-war stock.
The 1954 vintage matters meaningfully for prospective buyers. Compared to pre-war Park Avenue inventory:
- Ceiling heights are typically 8.5–9 feet rather than the pre-war 10–11 feet
- Building systems are post-war (central air, modern plumbing) rather than original 1920s
- Layouts lean toward L-shaped living/dining combinations rather than the pre-war formal foyer + separate dining room
- Walls are sheetrock rather than plaster, with materially different sound isolation
- Maintenance is typically lower than comparable pre-war buildings
- Architectural detail (moldings, fireplaces, prewar character) is absent
The southwest-corner positioning at Park Avenue and East 64th Street places 605 Park at the heart of the Lenox Hill Gold Coast corridor — three blocks south of the dense 720/740/770/778 Park Avenue Candela pre-war cluster and within walking proximity to The Frick Collection (Fifth Avenue and 70th), Park Avenue Armory, and the broader Lenox Hill amenity base.
For buyers, 605 Park represents a particular tier of Lenox Hill Park Avenue inventory: post-war Sylvan Bien architectural pedigree, central Lenox Hill positioning, materially lower per-square-foot pricing than the surrounding pre-war stock, and the post-war ease (modern systems, lower maintenance) that some buyers actively prefer over the pre-war character.
For the broader framework comparing pre-war and post-war Manhattan inventory: Pre-war vs. Post-war Manhattan Apartments.
Architecture and unit composition
The building's 1954 post-war vintage produces the era's signature architectural language: 21-story white-brick massing, modular casement windows, modernist clean lines, and a building scale materially larger than the surrounding pre-war stock. The architectural language is characteristic of Sylvan Bien's mid-1950s Park Avenue idiom.
Post-war signatures throughout the building:
- 8.5–9 foot ceilings in primary rooms
- L-shaped or combined living/dining layouts in many lines (rather than pre-war formal foyer + separate dining)
- Modern bathroom and kitchen positioning consistent with 1950s luxury construction
- Some apartments include private balconies (a post-war feature absent from the surrounding pre-war stock)
- Central air conditioning and modern building systems
The southwest-corner positioning at Park and 64th produces distinctive apartment configurations on the corner residences, with cross-exposure light access. Park Avenue-facing apartments (east exposure) look across the Park Avenue median plantings. 64th Street-facing apartments (south exposure) have cross-street exposures.
Building operations
605 Park Avenue operates as a full-service post-war cooperative. Specific operational details — corporation name, managing agent, 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 Park Avenue norms.
Local Law 97
- 2024–2029 annual penalty
- $0 (under cap)
- 2030–2034 annual penalty
- $23,013/yr
- Per unit / month range
- $0 – $18
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
- Flip tax of 2% of the sales price is due on the sale
- Sublet policy
- Allowed
- Pied-à-terre
- 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 |
|---|---|---|---|---|---|
| May 20, 2026 | 6F | 2 BR · 2 BA | $1,795,000 | +0.0% | |
| Oct 16, 2025 | 19C | 2 BR · 2 BA · 1,400 sf | $2,375,000 | $1,696/sf | +5.6% |
| Jan 16, 2025 | 10E | 2 BR · 2.5 BA · 1,773 sf | $1,835,000 | $1,035/sf | +0.0% |
| Nov 25, 2024 | 5D | 1 BR · 1 BA · 948 sf | $1,195,000 | $1,261/sf | +0.0% |
| Sep 18, 2024 | 7D | 1 BR · 1 BA · 950 sf | $925,000 | $974/sf | -7.4% |
| Sep 12, 2024 | 17C | 2 BR · 2 BA | $2,075,000 | +0.0% | |
| Aug 19, 2024 | 17D | 2 BR · 2 BA | $1,995,000 | +0.0% | |
| Jul 15, 2024 | 8BC | 3 BR · 4 BA · 3,000 sf | $4,900,000 | $1,633/sf | -12.1% |
Market read. $/sf is measured on the latest sales with reliable square footage (2025): a median $1,071/sf across 2 sales. The building has traded as recently as 2026. Median listing discount 4.0% 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 |
|---|---|---|
| Sep 9, 2003 | 18B | $1,200,000 |
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 1-01399-0074) 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 post-war structural reality matters. 605 Park is a 1954 Sylvan Bien post-war white-brick cooperative — materially different from the surrounding 1920s pre-war stock. Expect 8.5–9 foot ceilings (vs. pre-war 10–11), modern building systems including central air, and modernist layouts. Verify any specific apartment's renovation, ceiling height, and exposure during walkthroughs.
Pricing is materially more accessible than the surrounding pre-war stock. 605 Park typically trades at per-square-foot pricing well below the 720/740/770/778 Park Avenue pre-war trophy cluster three blocks north. For buyers prioritizing post-war ease over pre-war character, the value proposition is real.
Confirm specific policies directly with management. Financing posture, flip tax structure, sublet specifics, and pied-à-terre allowance should be obtained 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. The building's position in the Upper East Side Historic District means LPC oversight on any exterior work.
What to know if you’re selling
The post-war structural advantages and Sylvan Bien pedigree are marketing assets. Listing copy should reference Bien's broader Manhattan post-war portfolio (including 200 East 66th and substantial UES mid-century work), the 1954 vintage, the southwest-corner Park / 64th positioning, modern building systems, and the post-war ease relative to the surrounding pre-war Park Avenue stock.
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 605 Park Avenue, also evaluate:
- 200 East 66th Street — Sylvan Bien post-war peer (same architect, similar era; nearby UES)
- 610 Park Avenue — pre-war Lenox Hill peer (different era, comparison reference)
- 625 Park Avenue — Carpenter pre-war Lenox Hill peer
- 660 Park Avenue — pre-war Lenox Hill peer
- 750 Park Avenue — Horace Ginsbern 1951 post-war Lenox Hill cooperative (closest peer in era and architectural language)
- 720 Park Avenue — Candela 1929; pre-war trophy reference north
- 740 Park Avenue — Candela/Cross & Cross 1930; pre-war trophy reference north
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 605 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 605 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.