This 36-story tower located at 300 Madison Avenue was under construction when the tragedy of September 11th occurred. The building's exterior facade had been erected from the tenth floor to the top with the lower 9 floors remaining unclad. As a result of the 9/11 attacks which included first-hand observation of the deadly effects of flying debris and safety concerns of broken windows, the glass specification for the lower nine floors was revised and upgraded to incorporate a laminated glass inboard ply for safety protection. In addition to safety concerns, the ability to maintain a functioning work environment after such events were the main incentives for revising the glass specification. This was also Viracon's first project to incorporate a gray silicone sealant on the insulating units.