Eighty South Street.

Santiago Calatrava seems to be everywhere right now, including The Met where they are showing his sculptures - the basis/inspiration for a lot of his structures, like the Eighty South Street Tower.

"Eighty South Street Tower would be the most original skyscraper to go up in the United States in many years. It would restore New York to a place where innovative architecture is generated, not merely acquired. And as the vision of a private developer, the tower rebukes all the hollow claims of boldness and excitement our builders habitually assert." New York Times

"The building will be Mr. Calatrava's first residential project in the United States. The principal units of the building are 45-foot glazed cubes, each of which contains four floors of residential space. Twelve cubes are cantilevered, in steplike fashion, up the building's vertical core, which in plan is a slender concrete rectangle. The core contains the building plant, main elevators, service elevator, and emergency stair, so that usable space within the cubes is maximized." Santiago Calatrava WebSite