The offer has been raised for the company that owns two malls in the Quad Cities.
Simon Property Group boosted its hostile bid for the Macerich Company by 5 percent to $16.8 billion and says that will be its best and final offer. Simon says it's willing to pay $95.50 per share for Macerich, up from its previous offer of $91 per share.
Macerich owns Northpark and Southpark malls, and it bought them from Simon in 2010.