Besides the fact that it is the first NYC skyscraper to be LEED “Green” certified, there are two notable fea-tures of the new, 52-story WTC 7: a concrete – not steel ¬– core that houses the safety systems, stairwells, etc.; and very thick fire resistant coating on its structural steel.
I took the following photos on the 45th floor of the new WTC 7 in September, 2006
Concrete Core Sprayed-On Fire Resistant Coating