
The shot was taken by ChicagoGeek, a local photographer who shoots a lot of architecture around the city. The article talks about the history of the Blue Star Auto Stores, saying:
Until 1900 it was a very respectable hotel but then illegal gambling began to take place in the basement, the upstairs became a brothel. Deep below the hotel was a series of secret tunnels, an elaborate 25-mile system. Today you can still see bricked-up entrances to the numerous gangster getaways.Photo Credit: (ChicagoGeek, Chicago Magazine)