Conditions are being imposed on the grant of the request 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 with respect to harmonious design of buildings, aesthetics, planting, and its maintenance as a sight or sound screen, and/or additional yard or open space, landscaping, hours of operation, lighting, number of persons involved, accessory activities, ventilation, noise, sanitation, safety, smoke and fume control and the minimizing of noxious, offensive or hazardous elements.