RTC Auctioning Homes: The federal Resolution Trust Corp.'s California Sales Center plans to sell $90 million in residential and commercial real estate by September in a series of auctions open to the public. The sale is unique in that the thrift mop-up agency has typically used sealed-bid auctions for its California properties. About $40 million in single-family homes, mostly in Southern California, will be sold by the RTC at seven separate events from mid-May through August, with about $50 million in commercial property offered at one auction in late July or early August. The first auction is May 16 at the Riverside Convention Center and involves 19 new Moreno Valley homes. For information, call (800) 266-8219.