At the time a building permit is requested for any building or structure, or at the time the use of land is changed which requires additional off-street parking space, a plot plan shall be submitted showing the location and layout of such required space along with access aisles, roadways, curbs and curb cuts. The Zoning Administrator shall disapprove such plans if he finds that the required spaces are not usable for standard-sized automobiles or do not comply with the requirements for offstreet parking as set forth in this title. (Prior code § 27-3-21(K))