A planted landscape buffer shall be provided and maintained by the owner or lessee of a nonresidential property contiguous to a residentially used or zoned property, except where natural or physical barriers exist. Buffer areas are required along lot and street lines of all nonresidential lots where such property lines or the center line of adjacent streets abut residential uses or residential zoning district lines and where a farm use abuts a major subdivision of five acres or more or a major site plan. Each permitted use shall provide and maintain attractively landscaped grounds and suitable screening in order to safeguard the character of adjacent districts. The width of the buffer areas for each particular zoning district shall be as prescribed in §
215-86. Buffer areas shall be measured horizontally and at right angles to either a straight lot or street lines, or the tangent lines of curved lot or street lines. No above surface structure or activity, the storage of materials or parking of vehicles shall be permitted in the buffer areas. All buffer areas shall be planted and maintained with grass or ground cover, together with a dense screen of trees, shrubs or other plant materials.