In applying and interpreting this chapter, its provisions shall be held to be minimum requirements adopted for the promotion of the public health, safety, morals, comfort, convenience, or the general welfare. The following specific regulations shall apply:
A. A minimum required lot or yard size for one building or structure shall not be used as any part of a required lot or yard for a second structure.
B. The required lot or yard for an existing building or structure shall not be diminished below the minimum requirements of this chapter.
C. The parking spaces required for one building or structure or use shall not be included in the computation of required parking spaces for a second building or structure or use.