Now that you mention it, I remember the No Exit being there. When I think of the No Exit, I still think of Sheridan Road near the El tracks. My oldest daughter, Manda, told me she spent many nights in her teen years in the No Exit listing to you. I believe it was in that location though I may be wrong. I'm happy to say that you brought her along in fine shape. I don't think Manda ever mentioned the Greenbriar Boys though. <g>
I'm glad to hear the No Exit remains extant. If they remain true to their purpose, there'll be another crop of young people introduced to folk music.