The proposed outdoor area shall be designed with sufficient dimensions and orientation to enable its conversion to a parking area which would serve the building if it were occupied for an alternative permitted use. An applicant for a day-care facility shall be required to submit a sketch layout indicating the prospective conversion of play area to a parking use, including the location of access aisles, stall dimensions, location of parking spaces and provisions of an area for perimeter landscaping, as provided by ordinance.