18 Gramercy Park South

Robert A.M. Stern Architects worked within the 1927 frame to produce a building that reads as classical and permanent. The apartments are large and light-filled, most of them full-floor, with four exposures capturing both the park and the downtown skyline. Finishes were specified at the top of the 2012-era new-construction market: marble showers, white-oak floors, and integrated high-end appliances. The signature residences — a three-level maisonette with its own private passage and a duplex penthouse spanning roughly 6,300 square feet — are among the largest condominium homes ever offered directly on Gramercy Park.

The sixteen-residence count and nineteen-story height do not establish ceiling heights, room dimensions or acoustic privacy; verify those features in the specific apartment. Park-facing rooms look directly across to Gramercy's gated greenery; upper floors gain skyline and open-sky exposures over the protected low-rise historic district.

The condominium is full-service: a 24-hour porter, a full-time concierge and staff, two rooftop porches, a club room, and a spa and wellness suite. As a condominium, there is no co-op board admission; purchases run through the condominium's application and right-of-first-refusal process, and financing is subject to the declaration. Pieds-à-terre are permitted and leasing is permitted with conditions; confirm investment ownership and current leasing rules in the declaration, bylaws and house rules. Pets are permitted. The Zeckendorfs marketed the building with the Gramercy Park key as a central amenity, even covering buyers' first year of park access at launch. Because the building sits inside the Gramercy Park Historic District, exterior work is subject to Landmarks review.

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 (2025) cleared a median $3,601/sf (recorded) across 1 sale. Median listing discount 5.6% 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 1-00875-7503; 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.

This is the park key without the board. The building's defining advantage is a Gramercy Park key paired with condominium ownership — no cooperative interview, financing flexibility, and permitted pied-à-terre and investment use. For buyers who want the park but not a co-op board, there is essentially no substitute on the block.

Check current inventory and turnover. Sixteen apartments describes the building’s size. Review dated sales and competing listings to establish how often comparable homes become available.

Underwrite full carrying cost. Common charges and property taxes on full-floor and duplex residences are substantial. Model the complete monthly carry — charges, taxes, insurance, and utilities — before committing.

Mansion-tax cliffs apply. At this building's price points, multiple mansion-tax thresholds routinely come into play. Run pricing through the Mansion Tax Calculator.

The architecture is a Stern signature. The classical, prewar-revival design is the building's identity. Buyers who value that idiom — the same language that made 15 Central Park West — will find it executed at intimate scale here.

Market the rarity directly. A new, Stern-designed, sixteen-unit condominium on Gramercy Park with a park key is close to unique. The scarcity itself is the headline.

Reach an international and flexible-buyer pool. The natural buyer often values condominium flexibility — global purchasers, part-time New Yorkers, and buyers financing or buying through entities. Marketing should reach that audience, not only the local co-op-oriented pool.

Price at the apartment level. With so few comparable homes, pricing must be built from the building's own trades and the closest large park-fronting residences, adjusted for floor, exposure, and condition.

Closing estimate. Expect roughly 30–45 days from contract to closing.

If you're considering 18 Gramercy Park South, also evaluate these park-fronting and Gramercy options:

• 1 Lexington Avenue — Herbert Lucas 1910 prewar co-op on the park's northeast corner, with the key
• 32 Gramercy Park South (Gramercy Towers) — large co-op near the park with a key
• 34 Gramercy Park East (The Gramercy) — NYC's oldest continuously operating co-op, with the park key
• 50 Gramercy Park North — modern park-fronting building with full amenities and a key
• Celeste Gramercy (150 East 23rd Street) — newer Gramercy condominium nearby
• Madison Square Park Tower at 45 East 22nd Street — modern luxury condominium a few blocks north