12 Angry Men (the original), The Dresser (both movie versions are great, the 2015 is a big production though), The Hateful Eight (technically two locations I guess, because first part is inside a stagecoach, then they reach the cabin the whole movie takes place), Moon (most of the movie takes place inside a moon station, but there are a few scenes he goes outside, so maybe doesn't count?), the first version of The Front Page (1931) takes place almost entirely inside the police department press room (if not entirely, I don't remember anymore)