If any other statute or regulation or any local ordinance of any county or municipality is applicable to any premises within the boundaries of the scenic highway zone, the provisions of the existing statute, regulation or local ordinance shall govern within the geographical boundaries of the county or municipality. If any other statute or regulation or any local county or municipal ordinance is applicable to any real property within the boundaries of the scenic highway zone, the provisions shall govern which require:
A. the lower height of buildings or a lessor number of stories;
B. the greater percentage of land to be left unoccupied;
C. the greater size of open space or use not requiring a structure or building; or
D. higher standards for scenic and historic values.