Every parcel of land hereafter used as a public, commercial or private parking lot shall be developed and maintained in accordance with the following requirements:
(a) Screening and Landscaping. Off-street parking areas for more than five vehicles shall be effectively screened on each side which adjoins or faces premises situated in any "R" District, or institutional premises, by a masonry wall or solid fence, such wall or fence shall be not less than four feet or more than six feet in height and shall be maintained in good condition without any advertising thereon. The space between such wall or fence and the lot line of the adjoining premises in any "R" District shall be landscaped with grass, hardy shrubs or evergreen ground cover and maintained in good condition. In lieu of such wall or fence, a strip of land not less than ten feet in width, and planted and maintained with an evergreen hedge or dense planting of evergreen shrubs not less than four feet in height, may be substituted.
(b) Minimum Distance and Setbacks. No part of any parking area for more than five vehicles shall be closer than twenty feet to any dwelling, school, hospital or other institution for human care located on an adjoining lot, unless screened by an unpierced masonry wall. If on the same lot with a main building, the parking area shall not be located within the front yard required for such building. In no case shall any part of a parking area be closer than five feet to any established street or alley right of way. The wall or hedge required in subsection (a) hereof, shall be set back from each street the same as if it were a building wall, so as to observe the front yard requirements of this Zoning Ordinance.
(c) Joint Use. Two or more nonresidential uses may jointly provide and use parking spaces when their hours of operation do not normally overlap, provided that a written agreement, approved by the Law Director and accepted by the Board of Appeals shall be filed with the application for a zoning certificate.
(d) Other Locations. Parking spaces may be located on a lot other than that containing the principal use with the approval of the Board of Appeals, provided a written agreement, approved by the Law Director and accepted by the Board of Appeals, shall be filed with the application for a zoning certificate.
(e) Surfacing. Any off-street parking area for more than five vehicles shall be graded for proper drainage and surfaced so as to provide a durable and dustless surface.
(f) Lighting. Any lighting used to illuminate any off-street parking area shall be so arranged as to reflect the light away from adjoining premises in any "R" District.
(g) Disabled Vehicles. The parking of a disabled vehicle within a residential district for a period of more than two weeks shall be prohibited, except that such vehicles may be stored in an enclosed garage or other accessory building, provided that no business shall be conducted in connection therewith while such vehicle is parked or stored.