 Although much of the film is set in Chicagos John Hancock Center,  the shopping area and parking garage as seen in the film do not  exist in the Hancock Center. The shopping area (especially the  escalators seen immediately before the art gallery sequence) is  across the street, in the Water Tower Place shopping mall. The  parking garage is definitely not the Hancock Centers, it was filmed  in a high rise dual tower complex called "Oakbrook Terrace" in a  suburb west of Chicago.