Andrew Carnegie Mansion

The Andrew Carnegie Mansion is a historic house and a museum building at 2 East 91st Street, along the east side of Fifth Avenue, on the Upper East Side of Manhattan in New York City. The three-and-a-half-story, brick and stone mansion was designed by Babb, Cook & Willard in the Georgian Revival style. Completed in 1902 for the industrialist Andrew Carnegie, his wife Louise, and their only child Margaret, it was the Carnegie family's residence until 1946. Since 1976, the house has been occupied by the Cooper-Hewitt Museum, part of the Smithsonian Institution. The mansion is internally connected to two townhouses at 9 East 90th Street (which became part of the building in the 1920s) and 11 East 90th Street, both of which are part of the Cooper-Hewitt. The mansion occupies the northern portion of a 1.2-acre (0.49 ha) site, providing space for a garden to the south and west. Although the mansion has a mostly symmetrical design, there is a service wing and a metal-and-glass conservatory protruding from the eastern facade. The mansion was built with numerous mechanical features, including dedicated heating and cooling systems, a steel superstructure, and elevators. It contains at least 64 rooms across three basements and four above-ground stories, including the attic. The first-floor rooms include a stair hall, the conservatory, a picture gallery, a library, and various other family

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