To answer the questions from the comments of one of my recent posts...
In the 8 years I have lived in the Chicago area:
Comiskey Park (home of the White Sox) has become U.S. Cellular Field
Marshall Field's department store was changed to Macy's. I know that I, and many other people I know, will not shop there anymore, in protest of them taking away the Marshall Field's name.
And now the Sears Tower will become Willis Tower, named after a British company that has leased 3 floors of office space in it. This company is a global insurance broker.
But King, erm, Mayor Daley is OK with all this, so I guess that makes it all good. (MAJOR sarcasm alert here...!)