Accessory buildings may be constructed within a rear yard provided that no portion of any such building within a rear yard intersects a plane commencing seven feet (7') in height, measured at the rear lot line, and extending at a slope of two horizontal to one vertical (2:1) toward the interior of the site area. (Ord. 85-O-1953, eff. 7-4-1985; amd. Ord. 90-O-2101, eff. 10-4-1990; Ord. 92-O-2147, eff. 9-4-1992; Ord. 95-O-2239, eff. 7-7-1995)