Scope of Provisions. Off-street parking, unloading and service requirements shall apply to all zones. No application for a building permit except for single-family dwelling shall be approved unless there is included with the plan for such building, improvement or use, a plot plan showing the required space for off-street parking, unloading and service purposes. An occupancy permit shall not be given unless the required off-street parking, unloading and service facilities have been provided in accordance with the approved plan.