Parking areas shall be contiguous to a RM-1, RM-2, OS, B-1, B-2, B-3, I-1 or I-2 District. Parking areas may be approved when adjacent to said districts or on the end of a block where such areas front on a street that is perpendicular to that street servicing the district. There may be a private driveway or public street or public alley between such P-1 District and the above-listed districts.