Exclusive club in Chi-town?

I was recently with a dancer that I've spent a few happy LDs with, and she mentioned a club in the city that she dances at occasionally. This place has supposedly been around a while, but I've never heard of it. It's called 'Members' or 'Members Only' on the south side. If anyone knows anything about this, please send an email. I'm an avid reader and very occassional poster of reviews, if you wish to check that out.