A non-conforming use may be extended as a special exception upon approval through application therefor to the Board of Zoning Appeals subject to the following:
(a) The extension becomes an attached part of the main structure and does not utilize additional or adjoining land area other than the original parcel.
(b) The extension does not encroach upon the yard height requirements of the district in which the non-conforming use is presently located.
(c) The extension is for the purpose of expanding the non-conforming use in existence at the time of the legal acceptance of these Standards.
Extension of a lawful use to any portion of a non-conforming building or structure which existed prior to the legal enactment of these Standards shall not be deemed the extension of such non-conforming use. (Ord. 9-3-68.)