One World Trade Center, while still under construction, yesterday became the tallest building in New York, overtaking the current tallest, the Empire State Building, by 6.4m.
Ironworkers installed two, 7.9m long steel interior columns on the top of the skyscraper just after 2pm local time.
The placement of the columns brings the height of the building to 387.4m above street level. When One World Trade Center is completed, it will rise to 541m to the top of its antenna, making it the tallest building in the Western Hemisphere.
To get to its present height, construction workers installed 37,000t of steel and over 145,000m3 of concrete—enough for a 1.2m sidewalk from New York to Chicago.