CHICAGO - JUNE 18: Entrance to the Wrigley Building on Michigan Avenue on June 18, 2012 in Chicago, Illinois. Built in the 1920's, it was the city's first air-conditioned office building.
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CHICAGO - JUNE 18: Entrance to the Wrigley Building on Michigan Avenue on June 18, 2012 in Chicago, Illinois. Built in the 1920's, it was the city's first air-conditioned office building.