Robert Maguire III

Founded Maguire Properties in 1965. Developed commercial property in downtown L.A., including 73-story U.S. Bank Tower. Public 2003; shares down 45% since. Stepped down as chairman this year after failed attempt to take private; still owns 16.5% of shares (worth $100 million). Also owns 10 million square feet of commercial property, developable land around Los Angeles and Dallas, Barnett Shale gas reserves in Texas, gate space and maintenance operations at private California airports.