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A committee of world building heights experts will announce next week whether a design change that affects the 408-foot needle on the new 1,776-foot World Trade Center tower disqualifies it from being counted as the nation's tallest skyscraper. The nonprofit Council on Tall Buildings and Urban Habitat met to render a judgment behind closed doors in Chicago, where the world's first skyscraper appeared in 1884. Disqualification would deny the World Trade Center the title as the nation's tallest.The main issue before the council is whether the tower's height should be measured to the top of the needle, which also serves as a broadcast antenna, or whether it should be measured to the roof of the building, at 1,368 feet. Under the council's current criteria, spires that are an integral part of a building's aesthetic design count; broadcast antennas that can be added and removed do not.