Screen Required When Adjoining Property is Residential. Where off-street parking, loading or service areas are proposed to be located closer than fifty (50) feet to a lot in any residential zoning district, or to any lot upon which there exists a dwelling as a permitted use under these regulations, except where a State or Federal highway or railroad coincides or is located between the lot line and the residential district, and where such parking, loading or service areas are not entirely screened visually from such lot by an intervening building or structure, there shall be provided along the lot line a continuous screen in accordance with applicable buffer and transition requirements set forth in this chapter. No such screen shall extend nearer to a street right-of-way line than the established building line of the adjoining residential lot.