655 Sixth Avenue (The O'Neill Building)
655 Sixth Avenue, New York, NY 10010
- Year built
- 1887
- Type
- Condominium — residential units above a substantial retail base
- Units
- 49
- Floors
- 7
- Landmark
- Designated
- Amenities
- Approximately 4,000-square-foot landscaped common roof deck with outdoor kitchen and dining areas, private storage, central laundry room; washer/dryers appear in residences per listing records
- Pets
- Permitted per brokerage records
Every recorded sale at this building, 2022–2026
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Recorded sales
- 23
- On record
- 2022–2026
The O'Neill Building is the oldest and most architecturally exuberant of the great Ladies' Mile department stores — an 1887 cast-iron emporium built for the Belfast-born retailer Hugh O'Neill, whose name still reads in relief across the pediment. Mortimer C. Merritt's design, with its white-painted Corinthian orders and rounded corner towers, anchored the Sixth Avenue retail spine in the decades when the elevated train delivered the city's shoppers to its doors. The store's later history is documented in The New York Times: O'Neill merged with the Adams Dry Goods store on the block to the north in 1906, the merged company closed in 1907 as garment manufacturing displaced retail, and by the 1920s the great selling floors had become lofts — the corner domes demolished along the way.
The 2007 conversion is what makes the building a residential proposition, and it was done at an unusual level of ambition. Elad Properties acquired the building in 2003 and converted it to 49 condominium lofts to a CetraRuddy design, with the Landmarks Preservation Commission's approval conditioned on reinstating the long-lost domes — which now sit regilded above the corner towers. The two-story penthouse addition required a zoning-lot merger and easement agreement with the Congregation Shearith Israel, whose early-1800s cemetery sits behind the building on West 21st Street — a piece of deal architecture as distinctive as the building itself, and one that effectively borrowed the cemetery's unused development rights to create five duplex penthouses with terraces.
The result occupies a scarce position: true 19th-century loft volume — rounded turret rooms, oversized windows, near-3,000-square-foot floor plates — inside a full-service doorman condominium, in a historic district that protects the streetscape. Most cast-iron loft conversions downtown are boutique walk-up-scale buildings run lean; the O'Neill pairs the loft envelope with 24-hour staff and a 4,000-square-foot landscaped roof deck. That combination, plus the Ladies' Mile location between Chelsea and Flatiron, is the building's durable market thesis.
Architecture and unit composition
The facade is the asset the district protects: five stories of cast iron painted to read as stone, organized in Corinthian bays with taller, broader glazing on the lower three floors — the legible DNA of a department store designed to flood selling floors with light. The two penthouse levels sit back from the street wall, deliberately subordinate; the restored corner domes carry the silhouette.
Inside, the 49 residences run from one-bedrooms through three- and four-bedroom lofts approaching 3,000 square feet, with the five duplex penthouses above. The signature inventory is the corner lines, whose living spaces wrap the window-banded curve of the towers — and the penthouses, where the largest spans roughly 4,800 square feet inside with some 2,500 square feet of terraces, including a bonus room inside one of the domes itself. Ceiling heights, column spacing, and window scale are genuine 1887 loft fabric; the finishes are conversion-era and have been re-renovated in many units since.
Building operations
Full-service condominium: 24-hour doorman and concierge, live-in-superintendent-scale staffing, private storage, central laundry plus in-unit washer/dryers per listing records, and the landscaped roof deck with outdoor kitchen. The retail base is a separate commercial condominium unit — residents do not carry the retail space, but should understand the commercial unit's voting and cost-allocation framework in the by-laws. The offering-plan amendment set on file in The Roebling Research Library documents the conversion's certificate-of-occupancy history, early budgets, and unit changes; it is the right starting point for attorney diligence.
Local Law 97
- 2024–2029 annual penalty
- $2,423/yr
- 2030–2034 annual penalty
- $89,478/yr
- Per unit / month range
- $4 – $159
Recent sales
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Recent closings at this building, sourced from NYC Department of Finance records. Apartment-level detail (line, condition, asking-price context) verified upon consultation request.
| Date | Unit | Price |
|---|---|---|
| Apr 10, 2026 | 7B | $985,000 |
| Mar 25, 2026 | 16B | $1,850,000 |
| Jan 20, 2026 | 2K | $1,664,000 |
| Nov 25, 2025 | 3A | $750,000 |
| Aug 13, 2025 | 2E | $2,765,000 |
| Aug 15, 2025 | 14A | $1,350,000 |
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 1-00796-7504) 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.
What to know if you’re buying
You are buying protected fabric. The Ladies' Mile Historic District covers the facade, the domes, and the streetscape; exterior alterations run through Landmarks. That is the guarantee that the thing you're paying a premium for cannot be diminished next door — and a process to budget for if your renovation touches windows or the envelope.
The corner lines are the building. The wrapped turret rooms are the inventory that does not exist elsewhere in the district; they price accordingly. Mid-block lines deliver the same loft scale at a meaningful discount — decide which product you're actually buying.
Condo mechanics widen the field. No board interview, condominium transfer flexibility, and a framework friendlier to trusts, LLCs, and pied-à-terre use than the surrounding co-op stock — confirm specific structures with the managing agent and your attorney.
Read the conversion documents, not just the listing. The amendment set on file documents the penthouse combination, the certificate-of-occupancy sequence, and the early budget reset (a 24 percent common-charge increase in the first resident-board year). Two decades on, the relevant question is the current budget and reserve posture — have your attorney review the latest financials alongside the historical record.
Mansion tax applies at nearly every price point here. Run the Mansion Tax Calculator at the intended price and understand the thresholds before you negotiate.
What to know if you’re selling
Market the narrative with precision. Hugh O'Neill, 1887, Merritt's cast iron, the demolished-and-regilded domes, the cemetery air-rights deal behind the penthouses — this is the best-documented story on the avenue, much of it carried in The New York Times. Buyers in this tier respond to verifiable history, not adjectives.
Position against both Chelsea and Flatiron. The building sits on the seam, and the buyer pool cross-shops loft conversions on both sides of Sixth Avenue plus the newer Flatiron towers. The pitch is singularity: full-service staffing and a roof deck inside an 1887 cast-iron landmark district building — a combination the comps cannot replicate.
Anchor to line-specific history. The spread between tower corners, penthouses, and mid-block lines is wide; building-average price per foot will misprice your unit in either direction. Same-line trades are the anchor.
Comparable buildings
If you're considering 655 Sixth Avenue, also evaluate:
- The Cammeyer (650 Sixth Avenue) — the converted Ladies' Mile shoe emporium directly across the avenue; the closest like-for-like
- Chelsea Mercantile (252 Seventh Avenue) — the neighborhood's large-scale loft conversion benchmark, one avenue west
- 141 Fifth Avenue — domed pre-war conversion on the Flatiron side; similar crown-and-cupola character
- 15 Union Square West — the former Tiffany & Co. cast-iron building reimagined as condos; the conceptual peer two squares east
- 212 West 18th Street (Walker Tower) — Chelsea's top-tier pre-war conversion; the price-ceiling reference
- 45 East 22nd Street — the new-construction Flatiron tower alternative for buyers weighing loft character against amenity depth
- The Grand Madison (225 Fifth Avenue) — large-floor-plate pre-war conversion on Madison Square; the NoMad-side alternative
The Roebling Team at The O'Neill Building
The Roebling Team at Compass works Chelsea, the Flatiron district, and the broader downtown loft-conversion market as a core practice area. We publish this building profile because O'Neill Building buyers and sellers deserve building-specific intelligence — conversion documentation, landmark mechanics, and line-level comparables — not generic neighborhood commentary.
If you're considering a transaction at 655 Sixth Avenue, a 30-minute consultation is the right starting point.