The following information was last updated on October 1, 2010. Multiple cranes on site for steel and concrete installation Tower steel is now above floor 40 Concrete is now being installed above floors 33 and 34 Both the south and north cores are now being erected as the structure rises "Cocoon" safety system now in place around upper perimeter, to rise with structure Final concrete installation on the sub-grade structure, including the surrounding plaza Utility installation and tie-ins Crews are coordinating substructure construction while maintaining PATH service Special Thanks to: The Lower Manhattan Development Corporation www.wtc.com www.rebuldgroundzero.com The National September 11 Memorial and Museum and www.wtcprogress.com
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