Sears conglomerate during the mid-20th century, adding Dean Witter and Coldwell Banker real estate in 1981, starting Prodigy as a joint venture with IBM in 1984, and introducing the Discover credit card in 1985. In 1974, Sears completed the 110-story Sears Tower in Chicago, which became the world's tallest building, a title it took from the former World Trade Center towers in New York. Sears moved to the new Prairie Stone Business Park in Hoffman Estates, Illinois, between 1993 and 1995. The Sears Centre is a 10,001-seat multi-purpose arena located in Hoffman Estates adjacent to the Prairie Stone campus. Even though
Grant Thornton Tower and Exchange Commission filings. Grant Thornton Tower Grant Thornton Tower (formerly Chicago Title & Trust Center, 161 North Clark and sometimes Chicago Title Tower) is an office tower located in Chicago designed by the firm Kohn Pedersen Fox Associates. Before completion in 1990 the twin tower design was awarded The Chicago Athenaeum's "Best Building" Architecture Award, the award was received by one of the lead designers Kevin Flanagan. (view PLP Architects). The fifty-storey building rises 756 feet (230 m) in the Loop and was completed in 1992, on the site of Chicago's Greyhound Bus Station. Previously, a structure at 111