Rarely available "B" line duplex in one of Park Avenues original grand buildings. Designed by famed architect Delano and Aldrich in 1907 this impressive limestone facade, 14 story cooperative is perfectly situated on the northeast corner of Park and 80th Street. This most coveted line in the building is a corner unit facing directly onto Park. The entry opens to a gracious gallery and flows into an enormous corner living room with a wood burning fireplace. It faces south and west and is bathed in sunlight throughout the day. In addition, there is a formal dining room, a library with a wood burning fireplace and a well equipped kitchen with a separate pantry and convenient access to the second floor via a back staircase. All rooms on the lower level flow into one another, allowing for wonderful entertaining and grand and gracious living. The charmed and original staircase leads up to a huge corner master bedroom with a wood burning fireplace and ensuite bath and extensive closets. There are 3 more bedrooms and a maids room that each have an abundance of closets. This is truly the ultimate New York City residence.