Maximum height of buildings shall be eighty feet. Provided however, that structures adjacent to residential zoned properties that exceed forty feet in height shall be setback from such residential properties a minimum of ten feet of setback for each ten feet of building height. Provided further building height may exceed eighty feet through a conditional use permit process. Conditional use permit approval shall be based upon adequate justification for exceeding the height including, but not limited to, compatibility with surrounding uses within the zone, the incorporation of unique architectural features, and mitigation of adverse environmental impacts. (Ord. 1125 §2, 2000; Ord. 583 §2.19(C)(2)(e), 1980).