When property is to be used under the Office-Laboratory District Classification for R-MF- 40, R-MF-24 or R-MF-15 District apartment use, then all regulations set forth in this Zoning Code pertaining to R-MF-40, R-MF-24 and R-MF-15 Districts shall take precedence and apply except that apartment buildings fronting or abutting upon a major arterial street shall have a minimum setback of 200 feet from such street. (Ord. 1971-192. Passed 4-6-72.)