Gensler's "Gateway Tower" is a 2000-foot (610 meter) conceptual proposal for the Chicago Spire site. The project is the winning entry for a company-wide internal competition to generate a new megatall structure for the 2.2 acre plot at 400 N. Lake Shore Drive. The mixed-use proposal throws out the residential luxury model that drove Santiago Calatrava’s design, with a concept inspired by tourism and public engagement.