The biggest...the Sears Tower in Chicago. In EV it looks like it laying down it is so tall.

Still the tallest in occupied floor and rooftop. The Sears Tower is the tallest building in North America at a quarter mile high.

I got to work on testing of the retrofitted 4 story domed entrance when it was discovered the high winds coming down the face of the tower blew people off the entrance podium.

Pics here.