This is the infamous Park13 Mosque site that generated all of the controversy a few years ago due to its proximity to the World Trade Center site. Instead, a 3 story Islamic Cultural Center will be integrated into the base of this tower.
They appear to be working on the foundation slab while the edges of the excavation finishes up. The 3 story Islamic Cultural Center is on the left with the 685 foot tower on the right. This is the Park13 "Ground Zero Mosque" site that caused so much controversy several years ago as it is about 1 1/2 blocks from 7 WTC.