Casa de Bandini and the Cospmopolitan Hotel, painting by RD Riccoboni. Located on corner of 2600 Calhoun St and Mason Street in Old Town San Diego State Historic Park and fully restored to it's full glory is one of the oldest standing adobe and colonial buildings in the western United States. Enjoy this piece of Americana. The Premier Gallery and artist Studio of San Diego California art. Your source decorating my bedroom, decoration my living room, decoration my dining room, decorating my home and office.