Hyatt Regency Chicago is a Hyatt hotel on East Wacker Drive in Chicago , Illinois . The hotel operates over 2,019 guest rooms in two different towers which were constructed in 1974 and 1980 . The towers are connected by both an above-ground skyway and an underground concourse . This underground concourse is considered to be part of the Chicago Pedway . The hotel has a multi-level conference center which includes a 25,000 square foot ballroom , and 85,000 square feet of meeting space . The conference center has been home to such events as the 40th , 49th , 58th and 70th World Science Fiction Conventions in 1982 , 1991 , 2000 , and 2012 respectively
40th
40th World Science Fiction Convention
Hyatt Regency Chicago