The distance between any two (2) adult related establishments shall be measured in a straight line, without regard to intervening structures, from the closest exterior structural wall of each business. The distance between any adult related establishment and any residential zone, religious institution, school or public park shall be measured in a straight line, without regard to intervening structures, from the closest property line of the residential zone, religious institution, school or public park to the closest exterior structural wall of such adult related establishment. (Ord. 1408, 11-25-1986)