The most prominent of the hotel's four stand-alone buildings is the Contemporary Tower, built as an A-frame with outer walls which slope inwards around an inner atrium. This design was a collaboration by Disney, the United States Steel Corporation, and Los Angeles architect Welton Becket. To construct it, steel frames were erected on site and modular pre-constructed rooms were lifted into place by crane. Approximately 500 guest rooms line the outer walls of this building. Room renovation should have been a simple matter of replacing modules when refurbishment was needed; however, it was found that the modules settled and became stuck in place, rendering them irremovable. Most of Disney's Polynesian Resort was built this way also. Another resort in Orlando that was built by US Steel was the Court of Flags Resort in 1972. They also had the slide-in modular units.
The Contemporary Tower houses most of the resort's key facilities, including resort registration and guest services (concierge). The main hall, named the Grand Canyon Concourse, is also located in the main Tower, and houses two restaurants and a variety of shops. The Walt Disney World Monorail System runs through the inside of this building, providing a monorail station here for resort guests. Also adorning the concourse walls is an enormous mosaic designed by Mary Blair.