floater
n.— «John Bricker, a retail designer and brand developer who owns a “floater,” a four-bedroom shingled cottage that was floated over from the mainland to Fire Island, N.Y., said that after commuting to a second home it was important not to think about money, or about guilt.» —“The Tyranny of the 2nd Home” by Tracie Rozhon New York Times May 18, 2007. (source: Double-Tongued Dictionary)