Established in 1992, SFX Preferred Resorts is the only Exchange Company specializing in the industries highest rated resorts… In the early days of the timeshare industry, the exchange process restricted owners to solely using their home resort's affiliated exchange company. Seeing the need to help owners of high quality resort properties expand their level of benefits and options, Mel Grant founded The San Francisco Exchange Company – SFX Preferred Resorts in 1992.