The Octagon is a luxury apartment building and historic landmark located at 888 Main Street, Roosevelt Island, New York, NY 10044.
• Original Structure:
Built in 1834–1835 by architect Alexander we Jackson Davis, the historic rotunda originally served as the entrance to the New York City Lunatic Asylum (later Metropolitan Hospital).
• Famous Association: Featured in Nellie Bly's 1887 investigative exposé Ten Days in a Mad-House.
• Modern Conversion: Reopened in 2006 as a residential complex managed by Greystar, integrating the historic rotunda into a modern apartment lobby.
• Landmark Status: Listed on the National Register of Historic Places and designated as an NYC Landmark.
