House at 240 Sea Cliff Avenue is a historic home located at Sea Cliff in Nassau County, New York. It was built in 1888 and is an irregularly shaped, -story house with a multiple cross-gabled roof in the Late Victorian style. The -story, gable-roofed east wing was added in 1908. It features a 3-story central tower with a tent roof.
It was listed on the National Register of Historic Places in 1988. It was included in a study covering the Sea Cliff Summer Resort area as a "Thematic Group".