second-homer
n a person who owns another house in addition to their main home, often in an area where they are not native and used as a holiday home
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014