At a glance General Growth Properties •Owns or manages more than 200 regional malls in 43 states

•Owns planned community developments and commercial office buildings

•Portfolio totals about 200 million square feet of retail space with more than 24,000 stores nationwide.

•Headquartered in Chicago

•Tuesday closing stock price $12.02 per share, up nearly 28 percent, on over-the-counter Pink OTC Markets Inc.

Simon Property Group •Largest public real estate company in the U.S.

•Owns or has an interest in 382 properties including regional malls, outlet centers, The Mills centers, community/lifestyle centers and international properties

•Owns or has interest in 261 million square feet of space.

•Headquartered in Indianapolis

•Closing stock price: $74.82 per share, up 3.9 percent, on the New York Stock Exchange.