One World Trade Centre, Lower Manhattan, New York City, New York, United States

In August 2012, One World Trade Center's steel officially topped out at the nominal 104th floor, at a total height of 1,368 feet (417 m). The tower's antenna was shipped to New York in November 2012; the first antenna section was hoisted to the top of the tower on December 12, 2012, and installed on January 15, 2013.
By March 2013, two sections of the antenna had been installed. The spire was expected to be completed on April 29, 2013, but weather delayed the delivery of the final pieces. On May 10, 2013, the final piece of the spire was lifted to the top of One World Trade Center, bringing it to its full height of 1,776 feet (541 m), and making it the fourth-tallest building in the world.
As of April 2014, the exterior elevator shaft was being removed, podium glass was being installed, interior decorating and finishings were being installed, and installation of concrete flooring and steel fittings was complete. The building opened on November 3, 2014, with 2,300 employees of its first tenant, magazine publisher Conde Nast, moving into spaces spread among 24 floors.