The following rules shall apply to all uses in this District, except that legal nonconforming uses may continue at the same performance level at which they operated before they became nonconforming in relation to this Zoning Ordinance:
(a) All uses and activities shall be inside buildings, with no outside storage or activity allowed.
(b) There shall be no noise carrying beyond a lot upon which a business is located, except for normal car and pedestrian activity.
(c) No business shall remain open to the public later than 1:00 a. m., or open before 5:00 a.m., local time.