20 East End Avenue carries forward the vocabulary of great New York apartment houses with the special inflection of the East End neighborhood. The massing and detailing recalls 1920s and 1930s New York residential buildings, as do its materials—Cunningham grey brick, with the first and second floors in limestone and a bush-hammered black granite water table—and its bay windows, Juliet balconies, and crown of setback terraces.
Filling out a Manhattan block, 20 East End Avenue has a strong relationship to the street, with a traditional entrance on East End Avenue and a porte-cochère off East 80th Street that leads to a cobblestone-paved motor court with lattice-work trellises, a fountain, and a private entry. Both entries connect to an octagonal lobby with a winding staircase connecting three floors of amenities, including a library, a billiard room, a wine cellar and wine-tasting room, a 3,000-square-foot gym, and a spa. The 17-story residential building comprises 43 residences scaled for family living, including half- and full-floor apartments, three duplex maisonettes, and two penthouses.