LEGO ARCHITECTURE: Sears Tower Chicago, IL (21000) New Factory Sealed RETIRED 673419113274 | eBay
Lego Architecture 21000 Willis Tower Used Complete with Box/Instruction | eBay
Bricker - Construction Toy by LEGO 21000 Sears Tower
LEGO 21000 Sears Tower Set Parts Inventory and Instructions - LEGO Reference Guide
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