I remember at one time having to figure out whether this little Latin Dance club behind the D's on Beltline was in fact a Mexican Restaurant or a nightclub. In the event, it proved to be the later, which was a little disappointing to me. As far as I know they were not affected by the 2011 fire at D's or the October 2015 flood, but I could be wrong.
(Hat tip to commenter Sidney)
UPDATE 13 February 2017 -- Here's an instructional video from the club: