A. Except for residential development in a residential zoning district, the finished first floor of new construction and additions to existing structures shall not be elevated more than 18 inches above the finished grade permitted in SMC 15.90.050.

B. In areas of substantial grade differential or large lots, or where existing structures or development sites are already elevated above the standards set in this section, the Planning Commission may approve exceptions from these standards; provided, that the intent of this chapter is achieved consistent with the findings set forth in SMC 15.90.010 and the purpose set forth in SMC 15.90.020.