One World Trade Center opened in the 2010s.
One World Trade Center . One World Trade Center became the tallest structure in New York City on April 30 , 2012 , when it surpassed the height of the Empire State Building . The tower 's steel structure was topped out on August 30 , 2012 . The building opened on November 3 , 2014 ; the One World Observatory opened on May 29 , 2015 .