A coordinated landscape plan shall be prepared incorporating the landscape treatment of open spaces, walkways, access roads and parking areas into a cohesive and integrated design that also enhances the relationship of buildings to their surroundings. In addition to aesthetic considerations, the landscape plan shall be designed to address functional considerations, such as stormwater drainage, erosion prevention, wildlife enhancement, screening and buffering, wind barriers, provision for shade, energy conservation and sound absorption, among other factors. Walkways shall be planted with regularly spaced, salt-tolerant shade trees, selected with regard to the scale of the area in which they are located as well as the height and spacing of exterior lighting, and the need to maintain visibility of storefront displays and signs. Attractively landscaped open spaces, courtyards and plazas, designed as gathering places and intended for maximum usability by pedestrians, shall be provided in appropriate locations. All open spaces, pedestrian walkways, parking areas and access drives shall be planned as an integral part of an overall site design, properly related to existing and proposed buildings.