 By March 2007 , 60 percent of the building had been leased . In September 2006 , Moody 's signed a 20 @-@ year lease to rent 15 floors of 7 World Trade Center . Other tenants that had signed leases in 7 World Trade Center , as of May 2007 , include ABN AMRO , Ameriprise Financial Inc . , Darby & Darby P.C. , Mansueto Ventures LLC , business publisher of Fast Company and Inc . , and the New York Academy of Sciences . 
