The Cornwall, at 255 West 90th Street, is a luxury residential cooperative apartment building in Manhattan, New York City. Located on the northwest corner of Broadway and 90th Street, it was designed by Neville & Bagge and erected in 1909. The developers were Arlington C. Hall and Harvey M. Hall. The twelve-story brick and stone building is noted for its elaborate balcony and window detail, and the "spectacular" design of its "extraordinary" ornate Art Nouveau cornice, which the AIA Guide to New York City called "a terra-cotta diadem." In 1991 the building's owner-occupants paid $600,000 to have the cornice and ornamented balconies replaced with terra cotta replicas of the originals.
- Gray, Christopher. "Streetscapes/Readers' Questions; Row House on W. 86th, Horse Auctioneers on E. 12th". New York Times (April 6, 2003)
- Horsley, Carter B. "The Cornwall" City Review
- White, Norval & Willensky, Elliot (2000), AIA Guide to New York City (4th ed.), New York: Three Rivers Press, ISBN 978-0-8129-3107-5 p. 351
- "Postings: To Have and to Hold; Balcony Tale" New York Times (February 24, 1991)
- Gray, Christopher "Who lived in 11 A". Old House Journal (January/February 1990) p. 52.
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