1 World Trade Center Hits the Halfway Mark

1 World Trade Center reached the halfway mark, the 52nd story, earlier this week.

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It has taken a little more than four years to reach this point—test drilling began in June 2006.

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Just shy of two years later, in May 2008, 1 World Trade Center would breach street level.

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The building's elevator core, its main structural support, rises in February 2009.

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A construction worker welds steel inside the building's core.

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Ironworkers assemble reinforced steel for the core, which will be encased in concrete.

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The first of the "jumbo columns" that will support the building is installed in August 2009.

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The first row of columns were complete in November 2009.

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The World Trade Center site in November 2009.

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1 World Trade Center reached 20 stories in February of this year.

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Notice the chamfered corners, the signature design feature of SOM's tower.

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The chamfer creates the tower's unusual, torqued shape.
The site photographed earlier this month.
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A worker on the 52nd floor.

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The tower has nearly surpassed 200 West Street, the newish Goldman Sachs headquarters.

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Looking south, the towers of the Financial District can be seen.

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It will not be long before 1 World Trade Center is the tallest structure in the city.

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Construction continues nonstop on the site, in hopes that that the memorial will be open in time for the 10th anniversary of 9/11. The towers will open a few years after.

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An intrepid construction worker added colored lights to the site earlier this month, turning it into the city's largest Christmas tree—bigger, even, than the one at Rockefeller Center.

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