Partial remains
The main house is gone but something survives on the ground: a gatehouse, a water tower, outbuildings, walls or the grounds themselves as a park.
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Beacon Towers
Beacon Towers was a white stucco castle on the shore at Sands Point, built in 1917 and 1918 for Alva Belmont, the.
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Farnsworth
Farnsworth was the Long Island country house of C. K. G. Billings, a Chicago industrialist and horseman, in the area now usually.
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Ferguson’s Castle
Ferguson's Castle, first called The Monastery, was the hillside home of Juliana Armour Ferguson above Huntington Harbor in what is now the.
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Harbor Hill
Harbor Hill was the Roslyn estate of Clarence H. Mackay, heir to a Comstock silver fortune and a leader in the telegraph.
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Knollwood
Knollwood was a 60-room granite country house in Muttontown built for the New York stockbroker Charles I. Hudson. The firm of Hiss.
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Laurelton Hall
Laurelton Hall was the country estate of the artist Louis Comfort Tiffany above Cold Spring Harbor, in what is now the Village.
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Matinecock Point
Matinecock Point was the country house of J. P. Morgan Jr. on East Island in Glen Cove. Christopher Grant La Farge designed.
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Meudon
Meudon was the Lattingtown estate of the New York lawyer William Dameron Guthrie. C. P. H. Gilbert designed the 80-room Renaissance Revival.
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Rosemary Farm
Rosemary Farm was the West Neck estate of the banker Roland Ray Conklin and his wife, Mary Macfadden Conklin, in what is.
