The very first two Lego Architecture sets, released 2008, featured Chicago's two most prominent skyscrapers, the Sears Tower (Set 21000) and the John Hancock Center (Set 21001). The Hancock, which failed to replicate the real building's slanted exterior walls, was discontinued at the end of 2011, while the Sears Tower set was renamed the Willis Tower, to coincide with the renaming of the real thing.

The Willis Tower is a straightforward build using 69 pieces.