Up to fifty percent (50%) of the parking spaces required for: 1) theaters, public auditoriums, bowling alley, dance halls, night clubs or cafes, and up to one hundred percent (100%) of the parking spaces required for a church or school auditorium may be provided and used jointly by: 2) banks, offices, retail stores, repair shops, service establishments and similar uses not normally open, used or operated during the same hours as those listed in 1); provided, however, that a written agreement therefor is properly executed and filed as specified below.