Except as otherwise provided in this article, no lot, premises, building or portion thereof in zone R-4 shall be erected, constructed, built, altered, enlarged, built upon, used, or occupied for any purpose other than as a public library, a single- or multiple-family dwelling and the usual and customary accessory and appurtenant uses thereto including one accessory dwelling unit on a lot developed only with a single-family dwelling subject to the criteria in section 10-3-409 of this chapter; a small community care facility; or transitional or supportive housing structured as a single-family residence or as a multiple-family dwelling. (Ord. 17-O-2724, eff. 2-10-2017)