Buildings on S. Michigan and Willis Tower (Ex- Sears Tower: 233 South Wacker Drive) - Chicago I.L.
I heard it was sold in 1994, and the name "Sears Tower" had changed to "Willis Tower" in July of 2009. A lot of "Sears" were in any towns in 1990. So, it is hard to believe it's changed to the another name.
Maybe, "Sears Tower" looked smiling or laughing and more funny than "Willis Tower".
