The developers of the World Trade Center reached a milestone Monday, completing construction on one of the four towers going up there -- the first since the 9/11 attacks, NBC New York reported.
A steel beam was hoisted on top of the 72-story 4 World Trade Center -- the shortest of them all, standing at 977 feet tall -- marking the end of structural construction. The inside of the building is still being worked on.
4 WTC is dwarfed by the site's anchor building, 1 World Trade Center, which will eventually tower 1,776 feet tall. Maki and Associates, the architects behind 4 WTC, told The New York Times that the building was intentionally designed to be understated.
The newly completed building is New York City's sixth-largest skyscraper. It is scheduled to open in 2013, and about half of the building has already been leased to the Port Authority.
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