The R-1-7.2 Single-Family Residential Zones are intended as districts for single-family homes, with not more than one dwelling and customary accessory buildings upon one lot. In addition, agricultural crops are permitted subject to the regulations set forth in the A zone. Except as specifically provided elsewhere in this title, any and every building and premises or land in the R-1-7.2 zone shall be used for or occupied, and every building shall be erected, constructed, established, altered, enlarged, maintained, moved into or within the R-1-7.2 zone exclusively and only in accordance with the regulations set forth in this chapter.
(`78 Code, § 17.18.010.)