Within the "S" Planned Commercial District, a building or premises may be used only for the retail sale of merchandise, services, recreation, except outdoor theaters, and similar uses, parking areas and other facilities ordinarily accepted as shopping center uses. The shopping center shall be designed as a whole, unified single project in compliance with the following requirements and, if built in stages, each stage shall conform with the approved plan.
1. The aggregate gross area of all buildings shall not exceed twenty-five percent (25%) of the entire lot area of the project and all buildings shall be set back at least thirty (30) feet from all lines of streets and alleys adjoining the shopping center site.
2. Off-street parking spaces shall be provided in the ratio of not less than one (1) parking space for each one hundred (100) square feet of floor area in the buildings in the project.
3. All roads, parking and loading areas and walks shall be paved with hard surface material meeting applicable specifications of the City Planning and Zoning Commission.
4. Any part of the project area not used for buildings or other structures, or for parking, loading, or accessways shall be landscaped with grass, trees, shrubs, or pedestrian walks.
5. No building shall exceed three (3) stories or forty-five (45) feet in height.
6. Reasonable additional requirements as to landscaping, lighting, signs or other advertising devices, screening, accessways, and building setbacks and height limitations may be imposed by the City Planning and Zoning Commission for the protection of adjoining residential property.