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

On January 31, 2012, the Port Authority stated that the tower's loading dock would not be finished in time to move equipment into the completed building, and that five temporary loading bays would be added instead, at a cost of millions. The temporary Trans Hudson station will not be removed until its replacement is completed, preventing access to the planned loading area. By March 2012, One World Trade Center's steel had reached the 93rd floor, and on March 30, the 100th floor was reached at a height of 1,240 feet (380 m). Though this floor was numbered as floor 100, it was in fact the 94th floor constructed since the intervening space was occupied by the high-ceilinged mechanical 91st floor. The incomplete tower became New York City's tallest building by roof height, superseding the 1,250-foot (380 m) roof height of the Empire State Building, on April 30, 2012. The Empire State Building's total spire height of 1,454 feet (443 m) remained unsurpassed until 2013, when One World Trade Center's antenna was installed.
On June 2, 2012, a fire broke out on the 89th floor of the tower, but was extinguished by New York City firefighters before causing any injuries or serious structural damage. However, firefighting efforts were delayed because the tower's emergency standpipes were found to be dry. On June 14, 2012, President Barack Obama visited the construction site and signed a steel beam that would be hoisted to the top of the tower. Obama wrote, "We remember, we rebuild, we come back stronger!"
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.