Truly one of New York City's most exquisite apartments, this duplex on ultra high floors in a triple A Park Avenue co-op needs no improvement. The light infused lower floor, surrounded by planting terraces, enjoys a marble foyer with a large adjacent powder room, a library enhanced by pale English paneling, an enormous living room with four exposures, a large corner dining room, modern kitchen, and breakfast room. Up the sweeping semi-circular stair are a double master with large closets and two baths, two other generous bedrooms with baths, a small gym, a maid's room with bath, and a laundry. Everything is in perfect neutral condition awaiting your arrival. Priced to sell at $18 million.