For any commercial or manufacturing development on a zoning lot adjoining a Residence District boundary, there shall be in the open area required by the provisions of Sections 33-29 and 43-30 (SPECIAL PROVISIONS APPLYING ALONG DISTRICT BOUNDARIES) along the lot line adjoining the Residence District, a strip at least four feet wide, densely planted with evergreen shrubs at least four feet high at the time of planting and complying with the provisions applicable to screening for parking areas as set forth in Section 107-483 (Planting and screening for open parking areas).
Where an existing residential use is located adjacent to a proposed manufacturing or commercial development, the developer shall plant along that part of the side or rear lot line adjacent to a residential use, a row of evergreen shrubs at least four feet high at the time of planting and which are of a type which may be expected to form a year-round dense screen at least six feet high within three years, or trees selected from Appendix B and spaced at 10 feet on center. Such screening shall be maintained in good condition at all times.
(a) Tree planting requirements
One tree, of three inch caliper or more, pre-existing or newly planted, shall be provided for each four parking spaces. Such trees may be located in the perimeter landscaped area of the parking area or in planting islands within the parking area.
However, where 30 or more parking spaces are provided, at least 50 percent of the required trees shall be located within planting islands within the parking area. Such planting islands shall have a minimum area of 150 square feet of pervious surface and comply with the requirements of paragraphs (a), (b) and (c) of Section 37-922 (Interior landscaping).
For open parking areas with at least 36 parking spaces, the total number of trees required pursuant to Section 37-922 (Interior landscaping) shall be superseded by the number of trees required pursuant to this Section.
(b) Screening requirements
The parking area shall be screened from all adjoining zoning lots by a landscaped area at least four feet in width, densely planted with shrubs maintained at a maximum height of three feet. Such parking area shall also be screened from all adjoining streets by a perimeter landscaped area at least seven feet in width. Such perimeter landscaped area may be interrupted only by vehicular entrances and exits. Sidewalks that provide a direct connection between the public sidewalk and a pedestrian circulation route within the parking area may also interrupt a perimeter landscaped area.
In addition, such screening shall be maintained in good condition at all times and may be interrupted by normal entrances and exits.
(c) Planting Waiver
Tree planting and screening requirements may be waived if the Commissioner of Buildings certifies that planting is unfeasible due to:
(1) unique geological conditions, such as excessive subsurface rock conditions or high water table;
(2) underground municipal infrastructure; or
(3) a City, State or Federal mandated brownfield remediation that requires the site to be capped.
Such waiver shall be based on a report prepared by a licensed engineer that such conditions exist.
For developments in Residential Districts, trees provided in accordance with the provisions of this Section may be counted for the purposes of meeting the requirements of Section 107-322, paragraph (a). Furthermore, for developments in Commercial or Manufacturing Districts which provide trees in accordance with the provisions of this Section, the requirements of Section 107-322, paragraph (a), shall not apply.