Retail Opportunity Investments Corp., a real estate investment trust (REIT), engages in the acquisition, ownership, and management of necessity-based community and neighborhood shopping centers in the eastern and western regions of the United States. As of December 31, 2011, its portfolio consisted of 30 owned retail properties totaling approximately 3.2 million square feet of gross leasable area. The company has elected to be taxed as a REIT, for U.S. federal income tax purposes. The company is based in San Diego, California with additional offices in New York City; Rancho Cordova, California; West Linn, Oregon; and Federal Way, Washington.