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
Retired Set 21000 Architecture Sears Tower
Amazon.com: Sears Tower Chicago Illinois USA LEGO 21000 ORIGINAL : Toys & Games
LEGO LEGO ARCHITECTURE: Sears Tower (21000) for sale online | eBay
LEGO LEGO ARCHITECTURE: Sears Tower (21000) for sale online | eBay
LEGO 21000 Sears Tower Set Parts Inventory and Instructions - LEGO Reference Guide