Just weeks after Steve Wynn opened his $2.7 billion Wynn Las Vegas, construction crews are preparing to break ground on another super-development. MGM Mirage's Project CityCenter is being dubbed as a city within a city on The Strip, with a 4,000-room hotel/casino, three 400-room boutique hotels, 550,000 sf of retail and entertainment space, and 4,000+ residential units spread over 66 acres between the Bellagio and Monte Carlo hotels. Perini Building, a subsidiary of Perini Corp., Framingham, Mass., was awarded a $3 billion contract to build the first phase. New York-based Ehrenkrantz, Eckstut & Kuhn Architects developed the master plan for the site. Gensler, San Francisco, is the executive architect. Cesar Pelli has been commissioned to design the 4,000-room hotel/casino. Scheduled completion: 2010.