Where visual mitigation elements are required on a blank wall along the ground floor level street wall pursuant to the provisions of Section 142-14 (Ground Floor Level Requirements), at least 75 percent of the linear footage of any such blank wall shall be treated by any of the following visual mitigation elements, or both.
When planting is provided as a visual mitigation element, any combination of perennials, annuals, decorative grasses or shrubs shall be provided in planting beds, raised planting beds or planter boxes in front of the street wall. Each foot in width of a planting bed, raised planting bed or planter box, as measured parallel to the street wall, shall satisfy one linear foot of frontage mitigation requirement. Such planting bed shall extend to a depth of at least three feet, inclusive of any structure containing the planted material. Any individual planted area shall have a width of at least five feet, and the height of such planting, inclusive of any structure containing the planted materials, shall be at least three feet.
At least 25 percent of such street wall width shall be planted in accordance with the provisions of this paragraph.
(b) Wall treatment
When a wall treatment is provided as a visual mitigation element, permitted signs, graphic or sculptural art, rustication, decorative screening or latticework, or living plant material, shall be provided along the street wall. Each linear foot of wall treatment shall constitute one linear foot of frontage mitigation requirement. Such wall treatment shall extend to a height of at least 10 feet, as measured from the level of the adjoining sidewalk or grade, and have a minimum width of 10 feet, as measured parallel to the street wall.