"FILE- In this Dec. 16, 2010, file photo, an ironworker connects a steel plate to a column at One World Trade Center in New York. The Empire State Building is visible in the rear upper left. One World Trade Center, the giant monolith being built to replace the twin towers destroyed in the Sept. 11 attacks, will lay claim to the title of New York City's tallest skyscraper on Monday, April 30, 2012, as workers erect steel columns that will make its unfinished skeleton a little over 1,250 feet, just high enough to peak over the observation deck on the Empire State Building. The milestone is a preliminary one. The so-called ""Freedom Tower"" isn't expected to reach its full height for at least another year, at which point it is likely to be declared the tallest building in the U.S. (AP Photo/Mark Lennihan, File)"