The provisions of this section shall not apply to grocery establishments, to stores selling canned or bottled beer only, to drugstores dispensing liquor on a prescription only, or to full-service restaurants whose primary purpose is to prepare and serve meals for consumption on the premises with an alcoholic beverage as an accompaniment to those meals.

No alcoholic beverage outlet shall be located in a store where any door providing customer access to the store is less than 300 feet measured in a straight line from the nearest property line of land occupied by any school or church, provided that no existing premises used as an alcoholic beverage outlet shall be deemed a violation of these regulations through the subsequent erection of a school or church.