Conditions shall be imposed on the granting of the request necessary to ensure 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 use is adequately safeguarded with respect to the harmonious design of buildings, aesthetics, plantings and their maintenance as a sight or sound screen, landscaping, hours of operation, lighting, number of persons involved, allied activities, ventilation, noise, sanitation, safety, smoke and fume control and the minimizing of noxious, offensive or hazardous elements.