Another big REIT buy for the M100 was General Growth Properties, the second-largest owner of shopping malls in the U.S. GGP owns or manages more than 200 malls in 44 states.

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An ambitious project that sums up GGP's vision is a massive redevelopment of the Natick Mall, a 40-year-old shopping center in suburban Boston.

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General Growth Properties ( GGP - news - people ), one of the largest mall owners in the U.S., which filed for Chapter 11 bankruptcy protection in one of the largest real estate failures in the country's history.

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