The Manhattan condos for sale at Extell Development Company’s One Manhattan Square offer residents access to some of the city’s most enviable green space. The 800-foot-tall Lower East Side luxury tower is home to the world’s largest private outdoor garden. Designed by West 8 Urban Design and Landscape Architecture, the garden accounts for 45,000 square feet of the building’s 100,000 square feet of total amenities. “These spaces were designed to serve as a private oasis within our community so that residents can enjoy their own private natural surroundings within the city,” says Extell’s Alan Oppenheimer.