Church, school, public auditorium, assembly or meeting room or similar place for public or semipublic assembly: one space for every three seats provided for assembly. In the case of a school with indoor and outdoor assembly, the outdoor and indoor spaces shall be counted separately, and the greater of the two numbers shall be utilized to compute the school's parking requirement. In addition, the indoor and outdoor assembly areas shall not be used simultaneously in a manner which renders the available parking on the property inadequate.