Shanghai Pudong is the classic example of how an “empty” urban construction project in the late 1990’s quickly became a fully occupied urban center, with a population today of roughly 5.5 million. A McKinsey study estimates that by 2025 China will have more than 220 cities with populations in excess of one million, versus 125 in 2010, and that 23 mega-cities will have a population of at least five million.