- Year built
- 1854
- Type
- Cooperative
- Landmark
- Designated
Every recorded sale at this building, 2003–2026
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf
- $1,666
- Listing discount
- 0.0%
- Recorded sales
- 8
- On record
- 2003–2026
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 434 West 23rd Street 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.
About the building
434 West 23rd Street was built in 1854 for merchant Edouard Bossange on land purchased from the former Chelsea estate. Its brick upper façade rises over a rusticated brownstone base, with flat window lintels and a bracketed Italianate cornice. The original stoop and railings have been removed. The house is approximately 25 feet wide.
The five cooperative residences include duplex and triplex layouts, with living rooms and bedrooms distributed across separate levels. Selected homes have south-facing terraces or roof decks overlooking the rear gardens. High ceilings, wood-burning fireplaces and in-home laundry recur in the interiors. Access through the building is by stairs, and the entrance has a digital entry system.
Recent sales
Recent transfers at this building, curated by The Roebling Team research desk. 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 5, 2026 | E | 2 BR · 1.5 BA · 1,200 sf | $1,999,000 | $1,666/sf | +0.0% |
| Jul 9, 2021 | E | 2 BR · 1.5 BA | $1,925,000 | -12.5% | |
| Jul 21, 2016 | A | 2 BR | $1,850,000 | -7.3% | |
| Jul 23, 2015 | E | 2 BR · 1,200 sf | $1,950,000 | $1,625/sf | +11.4% |
| Sep 4, 2014 | E | 2 BR | $1,700,000 | -2.9% | |
| Oct 15, 2003 | B | 2 BR · 1,600 sf | $1,225,000 | $766/sf | +0.0% |
Market read. Most recent trades (2026) cleared a median $1,666/sf across 1 sale. Median listing discount 0.0% from the last ask.
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 1-00720-0064) 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.
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
A multilevel home adds internal stairs to the walk-up approach. The route from the street to the principal living room, bedrooms and terrace is part of the practical floor plan. Roof-deck rights also need to distinguish exclusive use from responsibility for the membrane and structural work below; five residences share the building's capital obligations.
Comparable buildings
- 450 West 23rd Street: A same-block cooperative with similarly intimate ownership scale.
- 419 West 22nd Street: Another small cooperative within Chelsea's historic rowhouse stock.
- 461 West 22nd Street: A nearby low-rise cooperative with a comparable apartment inventory.
- Anderson House: A historic townhouse cooperative for comparing period interiors and outdoor spaces.
More Chelsea buildings
- 433 West 24th Street (West 24th Owners Corp.) — 1920 co-op
- Haddon Hall (433 West 34th Street) — 1930 co-op by Sugarman & Berger
- 434 West 20th Street — 1856 co-op
- 435 West 19th Street — 1924 condominium
- 436 West 23rd Street — co-op
- 442 West 23rd Street — 1855 co-op
The neighborhood
For the full corridor — architecture, transit, and pricing across Chelsea — read The Roebling Team Guide to Chelsea.
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 434 West 23rd Street?
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