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

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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