At The Irvine Company, everything goes according to plan -- the master plan. The real estate investment company plans and designs office, retail, and residential developments in California. It owns some 500 office buildings, and 40 retail centers, as well as hotels, marinas, and golf courses. Its Irvine Company Apartment Communities arm manages 115 apartment communities. The star in Irvine's crown, Irvine Ranch in Orange County, is one of the largest planned communities in the US with some 220,000 residents. It covers 93,000 acres, a drop from its original 120,000 acres back in the mid-1800s, when James Irvine bought out the debts of Mexican land-grant holders. Billionaire chairman Donald Bren owns the company.