A.
Nothing in this code shall be construed as preventing the ordinary maintenance or repair of any landmark, improvement on a landmark site or structure in an historic district which does not involve a change of design or material or other exterior effect and which does not require a building permit.
B.
Every owner, operator or agent of a landmark, landmark site or structure in an historic district shall keep in good repair all portions of such improvements which, if not so maintained, may cause the exterior portions of such improvements to deteriorate, decay or become damaged or otherwise fall into a state of disrepair.