The discreet understated facade of this pristine 20-ft wide brownstone located in the heart of the upper East Side, conceals one of the most spectacular and elegant classical interiors in New York City. One enters the building through a foyer leading into a gallery with unusual rusticated walls forming the backdrop for a beautifully proportioned open spiral staircase that is the core of the building. To the south, down an upholstered corridor with powder room and butler's warming kitchen/bar, is the dining room opening on to the perfectly square formal garden. The dining room is filled with bookshelves below an open section of the ceiling extending upwards, through the second floor, to a skylight 21 feet above. At the front of the house is the eat-in kitchen facing the street and a set of stairs leading to the fully renovated basement. The parlor floor with 12'3" ceilings, has an enormous double library lined with books and a wood burning fireplace. The south end is an atrium defined by its skylight and a tall iron and brass railing around the open central section above the dining table on the ground floor. The room has a wall of three over-scale windows overlooking the garden. At the other end of the house, through the gracious gallery and past the elevator and wet bar, is the grand, perfectly scaled living room with wood burning fireplace, lacquered walls, Georgian moldings and three tall mullioned windows facing East 73rd Street. The third floor is an elegantly appointed master bedroom suite comprising the bedroom, two bathrooms (one en suite), and a dressing room divided into three large walk-in closets. The fourth floor has two beautifully decorated bedrooms with en suite baths and ample closets. The equally appealing fifth floor has two more bedrooms (one now used as a sitting room), one bathroom, a small kitchen and an interior office. This space makes a perfect guest apartment. The immaculate basement has been cleverly conceived to include a gym, a wine closet, a large laundry, a sleeping area, a bathroom and very generous additional storage space. This superbly renovated townhouse has elevator access to all five floors, multi-zone central air conditioning, a new roof and many other amenities.