Seyfarth Shaw recently announced that it will move its Chicago office to the iconic Willis Tower (formerly Sears Tower) taking 200,000 square feet. The law firm reportedly is signing a 15-year lease in the landmark skyscraper at 233 S. Wacker Drive, leaving about 300,000 square feet at the Citadel Center, 131 S. Dearborn St., its home since 2007.