The Zoning Hearing Board may impose such conditions, in addition to those required in this chapter, as are necessary to insure that the general purpose and intent of this chapter is complied with and that the use of the property adjacent to the area included in the proposed change or modification is adequately safeguarded, which conditions may relate to, but are not limited to, harmonious design of buildings, aesthetics, planting and its maintenance as a sight or sound screen, hours of operation, lighting, allied activities, ventilation, noise, sanitation, safety, smoke and fume control, and the minimizing of noxious, offensive or hazardous elements.