Riverside, Calif. -- Vestar, in a joint venture with a fund advised by UBS Global Asset Management, announced that it has acquired Riverside Plaza, a 475,211-sq.-ft. retail center located on 35 acres in Riverside, Calif., for $84,844,000 in an all cash transaction. The acquisition marks one of the largest investment sales transactions in Southern California's Inland Empire region in the past 10 years. Vestar currently manages more than 22 million sq. ft. of retail properties in the West.