Taking the number-one spot in our annual construction countdown is the 1,550-foot-tall Central Park Tower, aka 217 West 57th Street, the tallest building by roof level in New York City and the entire western hemisphere, as well as the tallest residential building in the world. Work on the glass curtain wall is approaching the parapet of the slender reinforced concrete superstructure, which rises 99 stories above 57th Street, aka Billionaires’ Row. The project is designed by Adrian Smith + Gordon Gill and developed by Extell, which is expecting a $4 billion sellout on the tower’s 179 residences. A 320,000-square-foot Nordstrom flagship occupies the base of the building.