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Shoppers walk near a Simon Malls logo at Simon Property Group Inc.'s Roosevelt Field Mall in Garden City, New York, U.S., on Tuesday, Feb. 16, 2010. Simon Property Group Inc. offered to buy General Growth Properties Inc. out of bankruptcy for more than $10 billion and combine the two biggest U.S. mall owners. Photographer: Daniel Acker/Bloomberg via Getty Images

Shoppers walk near a Simon Malls logo at Simon Property Group Inc.'s Roosevelt Field Mall in Garden City, New York, U.S., on Tuesday, Feb. 16, 2010. Simon Property Group Inc. offered to buy General Growth Properties Inc. out of bankruptcy for more than $10 billion and combine the two biggest U.S. mall owners. Photographer: Daniel Acker/Bloomberg via Getty Images