It was controversially renamed in 2009 after London-based broker Willis Group Holdings leased a portion of the building and obtained the naming rights.

2009年，总部位于伦敦的威利斯集团(Willis Group Holdings)租下了这座大厦，获得了冠名权，较有争议地把这座大厦的名称改为威利斯大厦。

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Without a second thought, Willis hopped in his Jeep and drove to the Fisher Building in the Chicago Loop to check out the exchange.

威利斯不再多想，他走进吉普车，开到了芝加哥的费希尔大厦去看交易所。

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By comparison, the tallest building in the United States, the Willis tower in Chicago, stands at 1,451 feet, although counting its antenna towers it rises to 1,729 feet.

与之对比的是美国第一高楼——芝加哥的威利斯大厦，高1451英尺，如果加上屋顶天线的话总共高1729英尺。

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The tower's builders say it will surpass Chicago's Willis Tower as the tallest building in the United States, with a final height of 1, 776 feet -- a nod to the year of the Declaration of Independence.

CNN: Obama signs beam of One World Trade Center

The tallest building in the United States, the Willis Tower in Chicago, Illinois, stands 1, 450 feet high.

CNN: STORY HIGHLIGHTS

If it didn't have the spire, One World Trade Center would be shorter than the Willis Tower in Chicago, which stands at 1, 451 feet and currently has the title of tallest building in the U.S., not including its own antennas.

WSJ: Spire permanently installed on WTC tower