Sam Zell, a billionaire investor, walks off stage after spea

UNITED STATES - OCTOBER 09: Sam Zell, a billionaire investor, walks off stage after speaking at the Los Angeles Business Conference in Los Angeles, California, U.S., on Tuesday, Oct. 9, 2007. The conference, hosted by the Los Angeles Chapter of the Association for Corporate Growth, a networking organization for growth-oriented executives, investment bankers, private equity investors and professionals in law, accounting and finance, focuses on mergers and acquisitions and corporate development activity. (Photo by Armando Arorizo/Bloomberg via Getty Images)