Co-Exclusive. This is an exquisite 14 room duplex in an architecturally important 1910 Italinate building designed by McKim Mead and White. The residence was built for the Guggenheims and has all the space of a house but with full white glove services. While not the first apartment house on Upper Fifth Avenue 998 was the first true luxury building and much the grandest when it was built. Constructed as a series of mansions stacked on each other the 12 story buildings elegance and efficiency made apartment living highly desirable. With many original details intact this residence opens into an oversized gallery with a grand curving staircase and a powder room. Both the drawing room and the formal dining room have wood-burning fireplaces and the very large library includes a wet bar. The remainder of the lower level consists of a beautiful eat-in chefs kitchen a bedroom a staff bedroom and bathroom and a laundry room. The upper level includes the master bedroom with bathroom en suite a second master with wood-burning fireplace and bathroom en suite and two additional bedrooms each with bathroom en suite. In addition to the magnificent apartment itself this property conveys with a large wine vault downstairs as well as two additional spacious rooms - one currently being used as a gym and the other for out of season clothing storage. This is absolutely an extraordinary home. Apartment Features: East exposure North exposure South exposure Wood-burning fireplace Partial city view Building Features: Security