Illinois Institute of Technology. It's just South of Downtown. Outside of that, there's 58 within 25 miles of Millenium Park / Museum district. That actually rivals Charlotte for quantity and the course closest to downtown is a mile closer.
But not even close in quality. You've got to go an hour plus out of the city to get the Joliet area courses, an hour plus up to Round Lake to Fairfield or hour and a half to two hours to get the SE WI courses.