4. 9 DeKalb (Brooklyn)

The first appearance of Brooklyn in the super-slender game will be 9 DeKalb, joining the rapid development in Downtown Brooklyn. Designed by SHoP Architects, the tower will be 1066 feet and 73 stories. What sets 9 DeKalb apartment is the makeup of the units inside, as the Skyscraper Museum writes, “Unlike all the Manhattan towers, though, it will be a rental building that contains 500 rental units, of which 20 percent will be “affordable” due to the project’s 421-a tax exemption status.”