The area occupied by outdoor storage must be enclosed with a fence when located in a side or rear yard. In addition, the area and all goods stored, displayed or for sale/rental must be screened from off-site view. Said screening shall be achieved through the use of fencing or evergreen plants. Fences must be constructed of stone, brick, stucco or other material approved by the commission, and must be consistent with the design of the main building. In the event evergreen plants are used for screening, they must be six feet tall or the height of goods stored, displayed, or for sale/rental (whichever is less) at the time of planting, and must be spaced to completely conceal and reach the height of the goods stored, displayed, or for sale/rental within three years of planting.