In addition to Subsection D(1), (2), (3) and (4), above, in cases where a building or structure is nonconforming as to front, side or rear yard setbacks, an addition may be built on a line with the existing building, as long as it does not create an additional encroachment into a required yard. Any further encroachment with regard to required setbacks will require a variance. Any expansion under this section shall comply with the following standards:
(a)
Expansion shall not be permitted to extend closer to the road ultimate right-of-way than the front wall of the existing dwelling closest to the road.
(b)
Expansion shall not be permitted to create a new violation of the minimum side yard setback. An existing dwelling that violates the side yard may be expanded to the rear along the side yard building setback established by the wall of the existing building.
(c)
An existing dwelling that violates the rear yard may be expanded to the sides along the rear yard building setback established by the rear wall of the existing building.