Speaking from personal experience with "habilitación", I can guarantee you that if you were to call yourself a restaurant, the Agencia Gubernamental de Control, which regulates habilitaciones would not make a distinction between a regular and a closed-door restaurant. Getting a habilitacion municipal for a restaurant is extremely complex, you need a certain number of bathrooms, handicapped access, fire suppression equipment, ventilation systems for cooking, food storage equipment, and a million other things. So I would advise you don't try and get habilitacion for this type of business because you will be looking at lots of $$$ and the possibility of not being able to run the place legally. Stay off the radar screen if you can. And keep in mind, if you are thinking of running a closed door restaurant out of a residential property, you for sure won't get habilitacion because a house/apartment is not destined (legally) for commercial use.......good luck!