A three-story podium anchors the tower in place; the podium and two-story basement alone measure some 2,000,000 square feet (186,000 square metres) in their own right. The tower’s exterior cladding is made up of aluminum and stainless-steel panels, vertical stainless-steel tubular fins, and more than 28,000 hand-cut glass panels. A public observation deck, called “At the Top,” is located on the 124th floor.