Mainstream Energy Corporation Leases Sorrento Mesa Warehouse Space

SAN DIEGO – June 29, 2010 – CB Richard Ellis announced that Mainstream Energy Corporation leased 4,995 square feet of warehouse space at Nancy Ridge Technology Center, 6370 Nancy Ridge Drive, San Diego 92121. The three-year lease is valued at $152,056.

Steve Wells of CB Richard Ellis represented Mainstream Energy Corporation. Andy Irwin, also of CB Richard Ellis, represented the lessor, Nancy Ridge Technology Center LP.

About CB Richard Ellis

CB Richard Ellis Group, Inc. (NYSE:CBG), a Fortune 500 and S&P 500 company headquartered in Los Angeles, is the world’s largest commercial real estate services firm (in terms of 2009 revenue).  The Company has approximately 29,000 employees (excluding affiliates), and serves real estate owners, investors and occupiers through more than 300 offices (excluding affiliates) worldwide. CB Richard Ellis offers strategic advice and execution for property sales and leasing; corporate services; property, facilities and project management; mortgage banking; appraisal and valuation; development services; investment management; and research and consulting. CB Richard Ellis has been named a BusinessWeek 50 “best in class” company for three years in a row. Please visit our Web site at www.cbre.com/sandiego.