 The new 7 World Trade Center has 52 stories and is 741 ft ( 226 m ) tall . The building has 42 floors of leasable space , starting at the 11th floor , and a total of 1 @,@ 700 @,@ 000 sq ft ( 160 @,@ 000 m2 ) of office space . The first ten floors house an electrical substation which provides power to much of Lower Manhattan . The office tower has a narrower footprint at ground level than did its predecessor , so the course of Greenwich Street could be restored to reunite TriBeCa and the Financial District . 
