9. 3 World Trade Center (1,171 feet)

3 World Trade Center has actually been under construction since 2008, with some hiatus before finding an anchor tenant. It will top out at 1,171 feet despite an original plan for a building at 1,240 feet. The original building at 3 World Trade Center was a Marriott, destroyed in the attacks of 9/11. GroupM will be the anchor tenant.