Expert panel: 1 World Trade Center is tallest U.S. building

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FILE- In this April 17, 2012, file photo, One World Trade Center, now up to 100 floors, rises above the Manhattan skyline in New York. On Monday, April 30, One World Trade Center _ being built to replace the twin towers destroyed on 9/11 _ gets steel columns to make its unfinished framework a little higher than the Empire State Building's observation deck, to become the tallest building in New York. (AP Photo/Mark Lennihan)