A look at Chicago’s ever changing architecture with Joni Hirsch Blackman’s “This Used to Be Chicago”

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The Chicago downtown skyline including the Willis Tower, formerly known as the Sears Tower, is seen from the air on February 15, 2013. ( SAUL LOEB/AFP/Getty Images)

Author Joni Hirsch Blackman joins Roe Conn and Anna Davlantes with a look at Chicago’s rich architecture and her new book, “This Used to Be Chicago.”

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