The upcoming 10th anniversary of the 9/11 attacks has led to a focus on construction at the new World Trade Center, along with the five other skyscrapers on the site. The main tower is now 80 stories tall, its glass facade reaching the 56th floor and steel rising above the 81st floor. Safety and security features of the new tower include widened and ventilated staircases, a different set of stairs for firefighters, and concrete-protected sprinklers.

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