A townhouse within a townhouse! This stunning townhouse duplex is on one of Manhattan''s most beautiful tree-lined blocks. The apartment is nestled on the top 2 floors of the building with only the roof above, lending itself to become your own private retreat. Built around 1925, this prewar landmarked limestone mansion is located just off of Fifth Avenue in the heart of the Upper East Side. Enter through the gracious foyer leading to an expansive living room with soaring ceilings. A decorative fireplace adds a unique focus to the living room/dining room. Wall to wall windows frame a picturesque street view, overlooking the iconic Warburg mansion. This expert renovation includes custom finishes and moldings, including custom made wood paneling and hardwood floors. The truly unique extra wide staircase seamlessly joins the 2 levels and is an architectural wonder. The third bedroom, located on the main level, has its own full bath and is currently used as a library. The enclosed kitchen is adjacent to the living room/dining room setting the stage for memorable gatherings. There are 2 bedrooms on the lower level, with each one having a dedicated bathroom. A separate entrance is accessible on this level as well. A washer/dryer is permitted in unit with board approval. Located between Fifth and Madison Avenues, 16 East 80th Street is ideally situated on the Upper East Side. There are presently 7 apartments and 5 floors in this 25'' wide limestone mansion. The building has made several improvements this year, including a new roof, new elevator and renovated hallways. This intimate cooperative is in close proximity to Central Park, the Metropolitan Museum Of Art, and local restaurants.