A. In the single-family residential districts, no alteration, addition, or other structural change to the interior or the exterior of any single-family dwelling shall be made if such alteration, addition or other structural change would alter the essential single-family character of the dwelling.

B. In the two-family residential, rural residential, and rural estate districts, no alteration, addition, or other structural change to the interior or the exterior of any single-family or two-family dwelling shall be made if such alteration, addition or other structural change would alter the essential permitted residential character of the dwelling. (Ord. 2002-04 § 5, 2002. 2004 Code § 18.50.190.)