Chicago's Willis Tower, previously known as the Sears Tower, will no longer be the country's tallest structure when New York City completes construction of One World Trade Center at Ground Zero in three years. But architectural loyalists say the city has become an international source of skyscraper expertise through the work of Chicago-based architecture firms like Skidmore, Owings & Merrill. "Where we're hanging our hat on," said Lynn Osmond, president of the Chicago Architecture Foundation, "is that our guys are still building the tallest buildings in the world."

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