Impose such conditions, in addition to those required, as are necessary to assure that the general purpose and intent of the Zoning Ordinance is complied with, which conditions may include, but are not limited to, harmonious design of buildings, planting and its maintenance as a sight or sound screen, aesthetics, landscaping, effect on natural resources, hours of operation, lighting, numbers of persons involved, ventilation, noise, sanitation, safety, smoke and fume control and the minimizing of noxious, offensive or hazardous elements.