4 World Trade Center

Conceptual Design September 6, 2006
Schematic Design March 1, 2007
Design Development July 1, 2007
Foundation Construction January - July 2008
Construction Drawings April 1, 2008
Superstructure to Ground Level July 2008 - January 2009
Structural Steel Erection January 2009 - Spring 2012
Curtain Wall Winter 2012
Temporary Certificate of Occupancy Fall 2013
Building Opens November 2013