A certificate of appropriateness issued by the Commission shall be required before a building permit, moving or demolition permit is issued for any designated historic landmark or any building, structure or site or part thereof in the Historic District. It is required if the building, structure or site will be altered, extended, or repaired in such a manner as to produce a major change in the exterior appearance of such building or structure. Such major changes include, but are not limited to (subject to adoption of guideline amendment developed by Historic Preservation Commission and City staff):
A.
Major changes by addition, alteration, maintenance, reconstruction, rehabilitation, renovation or repair;
B.
Any new construction and demolition in whole or in part requiring a permit from the City of Crystal Lake;
C.
Moving a building;
D.
Any construction, alteration, demolition or removal affecting a significant exterior architectural feature as specified in the ordinance designating the landmark or Historic District.