Number of spaces. Any buildings hereafter erected, used or occupied for any of the following uses shall be provided with at least the number of parking spaces set forth below.

Size of spaces. Each parking space shall measure at least 18 feet in length and nine feet in width. All parking areas shall be located within a reasonable distance of the buildings and uses which they serve and shall be provided with adequate interior driveway areas. Parking spaces shall be surfaced with gravel, cinders, red shale or pavement.

Application to existing uses. Parking provided with respect to a building or use which is subject to a parking requirement shall not hereafter be reduced if the resulting parking is less than that required by this section. In the case of an expansion or extension of or an addition to any existing building or use, the parking requirements of this section shall apply only with respect to such expansion, extension or addition.