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.
In this June 24, 2009, file photo Anna Kane, 5, looks down from "The Ledge," at Chicago's 110 story, 1,450 foot Willis Tower. The glass balcony is suspended 1,353 feet in the air and juts out 4 feet from the Sears Tower's 103rd floor Skydeck. The Tower was in contention with the 104-story, 1,776 foot One World Trade Center, a skyscraper built at the site of the 9/11 attacks on the World Trade Center in New York as the tallest building in America. The New York skyscraper won out.
One World Trade Center, center, is seen from the 56th floor of its neighbor, 4 World Trade Center, Thursday, Nov. 7, 2013, in New York. The 1,776-foot One World Trade Center is the marquee skyscraper at ground zero; but the first office tower to open there will be its shorter neighbor 4 World Trade Center on Wednesday, Nov. 13.
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.