Nothing in this title pertaining to nonconforming buildings and uses shall be construed or applied so as to require the termination, discontinuance or removal, or so as to prevent the modernization, replacement, repair, maintenance, alteration, reconstruction or rebuilding of public utility distribution stations, buildings, structures, uses, equipment and facilities; provided, that there is no change of use or increase of its areas so used.
(1964 Code Appx. A § 10.50)