350 West 71st Street

DXA Studio's conversion kept the 1900–1901 street walls and rebuilt everything behind them. The two façades were retained and restored rather than replaced — the practical consequence of a landmarked site, and also the reason the building reads as prewar from the sidewalk and as new construction from the entry hall in. Interior structure, mechanical systems, egress and cellar were rebuilt; the alteration filings show excavation work at 350 to gain cellar space, temporary standpipe and sprinkler systems threaded up the exterior during construction, and a full fire-protection plan filed in January 2019 shortly before completion.

The plan is unusually varied for a building of this size, because two separate buildings had to be knitted into one circulation system. The ground floor holds five residences: maisonettes with their own street access and garden residences opening onto private outdoor space at the rear. The second floor carries five apartments, lines B through F. Floors three through six carry a full six-apartment plate, lines A through F. Four penthouses occupy the top, two on each side of the building. Residences run two to four bedrooms, and the conversion's arithmetic — 38 homes in a building that once held rooms of roughly 280 square feet — produced an average residence in the neighborhood of 1,670 square feet, which is large by the standards of a boutique Upper West Side condominium.

The stack is worth reading by line rather than by floor. A, B and C sit in 346; D, E and F sit in 350. Sponsor pricing and subsequent resales show a wide spread across those lines at the same floor level, which is what happens when two buildings of different plan geometry are combined: exposure, ceiling condition and outdoor space vary more between lines here than they would in a purpose-built tower. Ground-floor maisonettes and garden residences trade on their private outdoor space; penthouses trade on private roof terraces.

The building runs as a doorman condominium with an amenity program scaled to 38 residences: a resident lounge, a fitness center, a children's playroom, bicycle and stroller storage, private gardens at grade, and a landscaped common roof deck with grill and lounge areas. That is a full program for a boutique building, and the fixed cost of running it is spread across a small denominator. Read the operating budget and the reserve position alongside the amenity list, not instead of it.

Two operating realities follow from the building's structure. First, it is landmark-regulated: LPC permits are required for many exterior changes, including window replacement and façade alterations, while ordinary maintenance can be exempt. Qualifying work can receive staff-level approval; work outside those rules may require a Commission hearing. Cost and timing depend on the project. Second, the systems, elevators, roof and mechanicals date to the 2014–2019 rebuild; confirm completion and current condition from recent engineering reports and board materials before assuming a light near-term capital picture. The building's first Local Law 11 façade cycle under its new ownership is the item to ask the managing agent about, because the restored 1900–1901 masonry is the one component of the building that was not replaced.

Ownership form: Condominium. Purchases clear through the board's right of first refusal rather than a cooperative approval.

Pets: Permitted per management-sourced records. Confirm weight and breed limits in the house rules.

Pied-à-terre, subletting, LLC, trust and foreign ownership: All permitted under the standard condominium framework. Confirm minimum lease terms for subletting with the managing agent.

In-unit washer/dryer: Permitted; residences are equipped.

Financing minimum: Not documented in public records. Confirm with the managing agent.

Flip tax: Not documented in public records. Any resale capital contribution should be established before pricing a sale.

Real estate taxes: Confirm the current bill on the specific unit lot. The building's residential unit lots were created in 2019, and any exemption position should be read off the current assessment roll rather than inferred from the building's vintage.

Recent sales

Recent closings 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.

Market read. Most recent trades (2026 to date) cleared a median $1,811/sf (floor-adjusted) across 2 sales. Floor-adjusted means each sale is restated to a constant mix of floors, so the figure can differ from the plain median of the sales listed above. Median listing discount 3.5% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.

Sales sourced from NYC Department of Finance recorded transfers (BBL 1-01182-7502; each condominium apartment is its own tax lot). 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 from recorded condo declarations and offering plans.

Search under both numbers. City data, tax bills and automated valuation output for this property come back under 346 West 71st Street. Your unit may be addressed 346 or 350 depending on its line. Neither is an error.

Check which building your line sits in. A, B and C are in 346; D, E and F are in 350. The two structures have different plan geometry, and same-floor apartments in different lines are not interchangeable comparables.

The neighbor at 342 is still an SRO. It was part of the original Riverside Studios group and was not part of the conversion. Walk the block and look at it before you sign.

Landmark regulation is real here. The façades are original and protected. Confirm the LPC permit route for window replacement, façade repair or other exterior alterations. Ordinary maintenance can be exempt, qualifying work may be approved by staff, and other work requires a Commission hearing; scope determines timing and cost.

Underwrite the amenity load. A doorman, a lounge, a gym, a playroom and a landscaped roof across 38 residences is a favorable ratio to use and an expensive one to fund. Ask for the operating budget and the reserve balance.

Confirm the financing minimum and any flip tax. Neither appears in public records for this building. Both change the math and both are answerable by the managing agent in a single call.

Lead with what cannot be rebuilt. A 1900–1901 landmarked façade with a 2019 building behind it, on a quiet historic-district block two blocks from the express train and two blocks from Riverside Park, is not a product a competitor can bring to market. That is the argument.

Present it as new construction, priced against condominiums. Buyers who benchmark this building against the prewar co-ops on West End Avenue will misprice it in both directions. The right comparable set is condominium inventory, and the right framing is a 2019 delivery.

Get the address ambiguity out of the way early. If the apartment is addressed 346, say so in the first paragraph and explain the single condominium. Buyers who discover it in diligence read it as a problem; buyers who hear it up front read it as a detail.

Same-building comparables are limited. With 38 residences, a 2019–2021 sellout and a modest resale history, pricing depends on line-level and outdoor-space analysis rather than on a building average.

If you're considering 350 West 71st Street, also evaluate:

• 235 West End Avenue (The Gemstone) — Bing & Bing's 1928 building, converted to condominium; it occupies the same tax block, and it is the nearest condominium comparable of any kind
• 235 West 71st Street — a 17-residence condominium conversion of a 1912 Gaetan Ajello building; the closest peer by size, tenure and conversion logic
• 200 West End Avenue — Costas Kondylis, 2008; the full-service new-construction condominium alternative a few blocks south
• 267 West 71st Street — an 1886–87 rowhouse walk-up cooperative in the West End–Collegiate Historic District Extension; the small-building co-op alternative on the same street
• 315 West 70th Street (Presidential Towers) — Morris Lapidus's 1963 cooperative on the same tax block; postwar scale and entirely different economics
• 230 West End Avenue — Rosario Candela, 1927, converted to cooperative in 1980; the prewar Candela co-op alternative one block east
• 243 West 70th Street — a 1925–26 Renaissance Revival cooperative inside the same historic district extension
• 340 West 72nd Street (The Chatsworth Annex) — John E. Scharsmith's 1905–06 landmarked cooperative at the foot of Riverside Park
• 205 West End Avenue (Lincoln Towers) — S.J. Kessler & Sons, 1961; the large-complex alternative with a condop structure