The R-3 Multiple-Family Residential Zone is intended as a residential district for single family dwellings, duplexes and multiple-family residences. Except as specifically provided elsewhere in this title, any and every building and premises or land in an R-3 zone shall be used for or occupied and every building shall be erected, constructed, established, altered, enlarged, maintained, moved into and within the R-3 zone exclusively and only in accordance with the regulations set forth in this chapter.
(`78 Code, § 17.24.010.)