One World Trade Center's structure was completed on August 30, 2012.
The tower 's steel structure was topped out on August 30 , 2012 .	topped out	Topping out
In building construction , topping out -LRB- sometimes referred to as topping off -RRB- is a builders ' rite traditionally held when the last beam -LRB- or its equivalent -RRB- is placed atop a structure during its construction .	construction	construction
