They only do exterior shots. As a matter of fact, they were filming there last night. There are hotels, hostels, and bed and breakfasts within walking distance of the bar. A few of the actors live in the neighborhood, too.
They don't film in the bar anymore. They used it for the first and maybe second seasons, then they build a replica of it in studio. But in saying that, it is s great place to go see and have s beer at. Buy a tee shirt and such.
Chicago Fire, PD and Med No longer film inside the bar. They havent since Season 2. They created a set and reproduction of the bar at Cinespace Film Studios in Chicago. They only time they film is now for outdoor occasions.
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