No residential occupancy shall be located above a mercantile or business occupancy unless the residential occupancy and exit stair therefrom are separated from the mercantile or business occupancy by construction having a fire resistance rating of at least one hour, or where the mercantile or business occupancy is protected throughout by an approved automatic sprinkler system as defined above, or by an automatic fire detection system that must be capable of sounding an alarm in the occupancies as required herein.
(Ord. 539. Passed 3-25-91.)