US & World

1 World Trade Center named tallest US building (photos)

This combination made from file photos shows Willis Tower, formerly known as the Sears Tower, in Chicago on March 12, 2008, left, and 1 World Trade Center in New York on Sept. 5, 2013. The new World Trade Center tower in New York knocked Chicago's Willis Tower off its pedestal as the nation's tallest building when an international panel of architects announced Tuesday, Nov. 12, 2013, that the needle atop the skyscraper can be counted when measuring the structure's height.
This combination made from file photos shows Willis Tower, formerly known as the Sears Tower, in Chicago on March 12, 2008, left, and 1 World Trade Center in New York on Sept. 5, 2013. The new World Trade Center tower in New York knocked Chicago's Willis Tower off its pedestal as the nation's tallest building when an international panel of architects announced Tuesday, Nov. 12, 2013, that the needle atop the skyscraper can be counted when measuring the structure's height.
/AP

An expert committee of architects declares that New York's new World Trade Center tower is now the tallest building in the U.S., surpassing Chicago's Willis Tower.

The Height Committee of the Council on Tall Buildings and Urban Habitat announced its decision Tuesday in Chicago.

The committee is widely recognized as the final arbiter of official building heights around the world. It has been studying whether a design change means the needle atop 1 World Trade Center is part of the actual building or merely the equivalent of a broadcast antenna.

The tower built on the site of the 9/11 attacks stands at a symbolically important 1,776 feet tall including the 408-foot needle. It officially would have been considered 1,368 feet tall without the needle.

Willis Tower is 1,451 feet tall.