Firefighters are battling a blaze atop the Old Chicago Main Post Office Building on Friday Downtown.The fire started at 6:29 p.m. on the roof of the old post office building at 433 W. Van Buren St., according to Fire Media Affairs.The Eisenhower Expressway (I-290) cuts through the building as it becomes Congress Parkway. The United States Postal Service vacated the building in 1997 for a newer …
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