Question: The mixed-use, urban complex where The Harmon was a highrise building at has how many square feet?
Sentence (from "CityCenter"): As of 2015, the "CityCenter" branding has been largely retired, with the focus instead on the Aria brand of the development's centerpiece property in names such as the "Aria Express" (formerly "CityCenter Tram") and "Aria Art Collection" (formerly "CityCenter Art Collection").
Relevant evidence: No