Part of production of many kinds of liquor is an extended aging process where it sits in a barrel and gains a lot of flavor. Some of the alcohol evaporates through the wood, filling the room in which these barrels are kept with alcoholic fumes. A visit to one of these rooms can be a highlight of a brewery or distillery tour, as you can get a mild buzz just from breathing the air.

What if you built a restaurant that served dual purpose as a storage area for aging barrels? You could lease the barrels so you wouldn't have to invest lots by buying them. My vague understanding of alcohol law is that it pertains to drinks, not vapor, so I don't think there are currently regulations here.