15 Union Square West
15 Union Square West, New York, NY 10003
Flatiron
BBL 1008427502 · BIN 1016065
- Year built
- 1870
- Type
- Condominium
- Units
- 36
- Floors
- 12
- Financing
- No building-imposed financing cap (condominium); financing is subject to lender underwriting.
- Subletting
- Leasing permitted (condominium); Board/association review applies. 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
- Parents purchasing for children permitted.
- Guarantors
- 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, 2009–2025
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf
- $1,317
- Listing discount
- 5.6%
- Recorded sales
- 86
- On record
- 2009–2025
15 Union Square West is the 1870 Tiffany & Co. flagship cast-iron building wrapped in 2008 dark-glass curtain wall — It is widely regarded as "a very handsome, modern, mid-rise, residential building" whose conversion "stripped away the bank's façade to reveal many of the original cast-iron façade elements that are now behind the new dark-glass façades."
It begins with the John Kellum / Charles Lewis Tiffany 1870 cast-iron original — Tiffany occupied the building through 1905, after which it served as a warehouse and then, from 1925, as the Amalgamated Bank. Bringing that history back into view is the Eran Chen conversion: Chen, then at Perkins & Will and later founder of ODA New York, revealed the cast-iron behind a new dark-glass envelope. The pairing of nineteenth-century bones and contemporary luxury extends to the amenity layer, where a two-lane 50-foot lap pool in Aqua-blue Bisazza stone sets the building apart from the Union Square condominium field.
Jason Sheftell (NY Daily News, August 7, 2008) called the redeveloped building "the finest, most complex and maybe even magical new condominium project currently for sale in New York City."
Local Law 97
- 2024–2029 annual penalty
- $59,082/yr
- 2030–2034 annual penalty
- $142,802/yr
- Per unit / month range
- $145 – $350
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.
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
- 1% of gross purchase price (Transfer Fee), due from purchaser at closing
- Sublet policy
- Allowed
- Pied-à-terre
- Allowed
- Notable fees
- Working Capital Contribution = 2 months common charges; short-term rentals/AirBnB not allowed
Recent sales
Recent closings 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 |
|---|---|---|---|---|---|
| Oct 30, 2025 | 4E | 3 BR · 3.5 BA · 2,670 sf | $4,025,000 | $1,507/sf | -5.3% |
| Jul 3, 2025 | 31 | 2 BR · 2.5 BA · 2,000 sf | $3,850,000 | $1,925/sf | -3.8% |
| Mar 7, 2025 | 4C | 1 BR · 1.5 BA · 1,560 sf | $1,700,000 | $1,090/sf | -20.9% |
| Jul 1, 2024 | 8 | 449 sf | $750,000 | $1,670/sf | off-mkt |
| Mar 8, 2024 | 9 | 2 BR · 2,189 sf | $6,450,000 | $2,947/sf | off-mkt |
| Jan 19, 2024 | 10 | 2,849 sf | $7,600,000 | $2,668/sf | off-mkt |
| Sep 23, 2022 | 2A | 1 BR · 1 BA · 755 sf | $1,480,000 | $1,960/sf | -1.3% |
| Jun 2, 2022 | 29 | 1,963 sf | $4,250,000 | $2,165/sf | off-mkt |
Market read. Most recent trades (2025) cleared a median $1,317/sf across 2 sales. Median listing discount 5.6% 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.
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 1-00842-7502) 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 from recorded condo declarations and offering plans.
What to know if you’re buying
The 1870 Tiffany & Co. flagship cast-iron provenance is real institutional context.
The Eran Chen / ODA New York founder conversion is real architectural-history credential.
The two-lane 50-foot lap pool in Aqua-blue Bisazza stone is structurally distinctive.
The Abigail Michaels Concierge Service is real institutional amenity infrastructure.
The Vincent Wolfe interiors and the bank-vault-door-replica lobby are structurally distinguishing.
The Sheftell "finest, most complex, maybe even magical" review anchors institutional positioning.
Comparable buildings
- One Madison (23 East 22nd Street) — CetraRuddy 2013; nearby Flatiron trophy peer
- The Flatiron Building (175 Fifth) — Burnham 1902 / Sofield 2026; nearby Flatiron trophy peer
- The Whitman (21 East 26th) — Mitchell 2013; nearby NoMad peer
- 34 Gramercy Park East — DaCunha 1883; nearby Gramercy trophy peer
- 50 Gramercy Park North — Lyons 1925 / Schrager 2004; nearby Gramercy trophy peer
Sources: The Roebling Research Library (offering plans, house rules, financial statements, board minutes, internal transaction records); NYC Department of Finance recorded transfers; publicly recorded NYC building data.
The neighborhood
For the full corridor — architecture, schools, transit, and pricing across Gramercy — read The Roebling Team Guide to Gramercy.
Considering a move at 15 Union Square West?
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