Claim: One World Trade Center's structure was completed on August 30, 2012.
Evidence: The tower 's steel structure was topped out on August 30 , 2012.
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.