Overlooking the East River between 56th and 57th Streets, 1 Sutton Place South is one of the city's finest addresses. The 13-story co-op residence has an elegant triple-arched driveway entrance that opens to a lobby that, in turn, gives way to a private garden facing the East River. Passersby can peer from the street through the arches and glimpse the garden???a rare degree of transparency. The neo-Georgian style building was completed in 1927 and designed by Rosario Candela, widely considered to have been the country's greatest designer of luxury apartment buildings. The pre-war building is topped an opulent penthouse???a 17-room unit that has 5,000 square feet of interior space and 6,000 square feet of terraces that wrap entirely around it. The pet-friendly co-op offers a full-time doorman, laundry facilities, the aforementioned private garden, and basement storage.