No retail, restaurant, outdoor dining area, or office in any building shall use any noisemaking instruments such as phonographs, loudspeakers, amplifiers, radios, television sets or similar devices which are so situated as to be heard outside any building at a level exceeding 65 decibels during daytime and 50 decibels between 10:00 p.m. and 7:00 a.m. No smoke, dust, fumes or objectionable odor shall be emitted from any building. The display of merchandise on the exterior premises of any building is prohibited, except as to sidewalk sales as provided herein.