found: Work cat.: Octagon Tower, Roosevelt Island (formerly Blackwell's Island and then Welfare Island), located approximately opposite East 79th Street, Borough of Manhattan, 1976, viewed September 29, 2016:p. 1 pdf document (Octagon Tower; The Octagon; served as the administrative center and main entrance hall of the New York City Lunatic Asylum)
found: Guide to New York City Landmarks, c2009:p. 402 (Octagon Tower, designated landmark in 1976; sole surviving portion of the city's insane asylum)
found: AIA guide to New York City, 5th ed., 2010:p. 954 (The Octagon (condominiums); originally Octagon Tower; conversion to apartments 2006; Octagon Tower, N.Y.C. Lunatic Asylum)
found: Wolfe, G.R. New York, 15 walking tours, c2003:p. 383 (Octagon Tower; Roosevelt Island; was New York City's first mental institution; building later abandoned)
found: The Octagon website, October 4, 2016(The Octagon; completed in 2006; 14-story apartment building on Roosevelt Island, NYC)
