- Year built
- 1854
- Type
- Cooperative
- Landmark status
- Not an individual landmark; in the Chelsea Historic District Extension
- NYC Landmarks Preservation Commission records, updated February 2026
- Pets
- Pets permitted; species and limits not stated
- Flip tax
- 1% of the purchase price, paid by the seller
- Doorman
- No doorman
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, 2026 to date
- $1,666
- 1 sale
- 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.
Application and transaction fees
Fees below are from building management's published schedule, as of August 2026. They are shown as published, item by item; no total is added because the total depends on the transaction. Deposits are listed apart from nonrefundable charges.
- Terms
- Equal to 1% of purchase price
- Rate
- 1% of the purchase price
- Paid by
- Seller
Source: building management's published schedule, as of August 2026
Purchase
6 items
Fees and charges
| Item | Paid by | When | Amount | Refundable |
|---|---|---|---|---|
| Application Fee | Paid by Buyer | When With the application | Amount $600 | Refundable Not stated |
| Credit Report FeePer applicantRequired | Paid by Buyer | When With the application | Amount $100 per person | Refundable Non-refundable |
| Buyer Power of Attorney FeePer applicant | Paid by Buyer | When At closing | Amount $250 per POA | Refundable Not stated |
| Recognition Agreement FeeConditional | Paid by Buyer | When At closing | Amount $400 (if financing) | Refundable Not stated |
| Shareholder Power of Attorney FeePer applicant | Paid by Shareholder | When At closing | Amount $250 per POA | Refundable Not stated |
| Transfer Fee | Paid by Shareholder | When At closing | Amount $1,250 | Refundable Not stated |
Sublet
2 items
Fees and charges
| Item | Paid by | When | Amount | Refundable |
|---|---|---|---|---|
| Application Fee | Paid by Subtenant | When With the application | Amount $600 | Refundable Not stated |
| Credit Check FeePer applicantRequired | Paid by Subtenant | When With the application | Amount $100 per person | Refundable Non-refundable |
Management updates its schedule without a public filing. The date is when management last updated the page, not when a rule changed. Confirm the current schedule with management before you apply.
Considering an apartment here? Send Corey the listing to discuss the building's costs and purchase requirements.
Own an apartment here? Request an apartment-specific pricing review.
Pets and in-unit washer/dryer
- Pets
- Pets permitted; species and limits not statedSource: The Roebling Team's building profile
- In-unit washer/dryer
- Not verified
Considering an apartment here? Send Corey the listing to confirm the pet and washer/dryer rules for that apartment.
Building staffing and amenities
- Doorman
- No doormanSource: The Roebling Team's building profile
- Elevator
- NoSource: NYC Department of City Planning records (PLUTO)
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.
Local Law 97
This building is below the 25,000 sq ft threshold at which LL97 limits apply to a building on its own. It is still covered if it shares a tax lot or condominium board with buildings totaling over 50,000 sq ft; confirm on DOB’s covered-buildings list.
See full Local Law 97 analysis →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 |
|---|---|---|---|---|---|
| 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 to date) cleared a median $1,666/sf (recorded) 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). 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 434 West 23rd Street and nearby.
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.
Keep up with 434 West 23rd Street and its market
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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
- 430 West 23rd Street — 1855
- 433 West 24th Street (West 24th Owners Corp.) — 1920 co-op
- 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?
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