Chelsea Green
Chelsea Green

151 West 21st Street
New York, NY


Alfa Development Management LLC


Architectural Design

Project Size

74,000 gsf

This 14-story condominium development in the heart of the Chelsea neighborhood is eco-friendly and is targeting LEED Gold certification. Chelsea Green offers 51 residences, ranging from one to three bedrooms, and a full floor, four bedroom, penthouse with a private 2,000 sf roof terrace. The design team integrated the most advanced systems to maximize energy efficiency, resource conservation, and indoor air quality, such as solar-thermal panels on the roof as a primary source of hot water heating, a heat recovery system that tempers cold air and delivers filtered fresh air year round, a state-of-the-art central heating and cooling system that allows for convenient zone control, and a green roof with a rainwater irrigation system.

Chelsea Green’s amenities, which reinforce it’s motto “the beauty of better living”, include a 24 hour attended lobby, concierge service, and a lounge with billiards and coffee bar. The development also makes “wellness” a top priority with a fitness room, a spa with integrated sauna, treatment room and shower. Other features include a landscaped rooftop terrace, bicycle storage, as well as a private storage space provided for each residence.

The high-performance building envelop features a gray Wisconsin limestone veneer, large openings with energy-efficient glazing, and aluminum brises-soleils. Chelsea Green is the first residential building in New York City to have thermally broken balconies, eliminating thermal bridging or heat loss through the balcony slab. The ground floor is accented with a decorative aluminum screen inspired by vintage wrought iron organic patterns, also visible on the building’s entrance canopy.