The home at 7244 S. Prairie Ave. once owned by mobster Al Capone and his family has hit the market for $450,000. It's a hefty sum considering similar two-flats in that working-class South Side neighborhood are selling for $180,000 to $230,000. But no other home in Chicago can match the history of the modest brick house that has had just two owners since Capone's mother died in 1952.