153 West 21st Street

The building reads as crisp and contemporary, its design driven as much by performance as by form: floor-to-ceiling insulating windows that bring in light while limiting heat loss and street noise (a low U-value is the measure of that; confirm the installed rating before quoting a figure). The 51 residences run from one to three bedrooms, finished to a high specification — FSC-certified walnut floors, modern kitchens and baths, and the open layouts the period's buyers expect. The upper-floor and outdoor-space homes carry the building's premiums; the green-building credentials add a layer of appeal that the surrounding pre-war stock structurally cannot offer.

Chelsea Green runs as a full-service condominium with a 24-hour doorman and concierge and a live-in superintendent. The amenity set includes the following: a landscaped rooftop deck with skyline views, a fitness room, a spa with a sauna, a billiard room, a bike room, and private storage. Washer/dryers are permitted in residence and the building is pet-friendly. As a condominium, there is no co-op board admission; purchases run through the condominium's application and right-of-first-refusal process. Confirm financing, leasing and ownership-entity rules in the current declaration, bylaws and house rules.

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 $1,982/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 0.0% from the last ask.

Sales sourced from NYC Department of Finance recorded transfers (BBL 1-00797-7508; 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.

As a condominium, the purchase path runs through the condominium's application and right-of-first-refusal process rather than a co-op board; confirm financing, leasing, pied-à-terre, trust, LLC and investment ownership rules in the current declaration, bylaws and house rules. Value here is driven by the home — exposure, floor, outdoor space — layered on the building-level draws of the amenity program and the green-building specifications, whose actual performance and operating costs should be checked against current records. We help buyers read the offering plan and financials, weigh common charges and taxes, and benchmark a given line against Chelsea's boutique-condominium set.

The selling case is distinctive: a LEED Gold, full-service condominium with a spa, fitness room, roof deck, billiard room, bike room and storage. Sustainability credentials and a real spa-and-fitness program differentiate a listing from the neighborhood's older and thinner-amenity stock, and buyers can assess their relevance to daily use, costs and current condition. Closing mechanics are condominium-standard — a right-of-first-refusal. With turnover light, a well-positioned home benefits from scarcity within the building; pricing belongs against the boutique full-service condominium set.

If you're considering Chelsea Green, also evaluate nearby Chelsea condominium inventory:

• 125 West 21st Street — full-service Chelsea condominium on the same block
• 140 West 22nd Street — pre-war loft-conversion condominium nearby
• 245 Seventh Avenue — a 33-residence 1911 loft building converted to condominium
• 252 Seventh Avenue — full-service Seventh Avenue condominium
• 50 West 15th Street — Flatiron-border condominium to the south