As a Chicago resident and Architecture fan, I love these three... as a fan of build techniques, man - 21000 and 21001 are some of the worst sets I've put together. : r/lego
Lego Architecture Willis Tower 21000 3D model | CGTrader
File:Lego Architecture 21000 - Willis Tower (7134946351).jpg - Wikipedia
Amazon.com: LEGO Architecture Willis Tower (21000) : Toys & Games
Lego 21000 Sears Tower | Lego 21000 Sears Tower. This set wa… | Flickr