A.   No other buildings except the usual accessory buildings, including private garages, private stables, and detached guest suites or pool houses which are appurtenant to and are, or are intended to be, used together with a public school, public library, public playground, or private one-family residence or dwelling shall be placed upon, erected, constructed, built upon, enlarged, altered, used, or occupied on any lot or parcel of land in zone R-1.5 except as otherwise provided in this chapter. Unenclosed accessory structures may contain kitchen facilities provided the structure does not also include bathroom facilities. For the purposes of this chapter, "unenclosed accessory structure" shall mean any accessory structure that has at least one open side (no more than 3 solid walls in a square or rectangular structure), and shall not include structures where the open wall is fitted with a sliding glass partition capable of fully enclosing the structure. Fully enclosed accessory structures shall not contain kitchen facilities.
   B.   Notwithstanding the provisions of subsection A of this section, an accessory building lawfully constructed prior to September 26, 2003, may provide complete, independent living facilities (including kitchen facilities) without otherwise conforming to the accessory dwelling unit standards set forth in section 10-3-409 of this chapter, provided the property owner has recorded a covenant in a form satisfactory to the city attorney restricting the use of the site to one bona fide housekeeping unit or was otherwise lawfully constructed in conformance with the applicable codes in effect at the time of construction. Notwithstanding any other provision of this code, any such accessory structure may be maintained indefinitely and may be altered or expanded without otherwise complying with the regulations applicable to accessory dwelling units. (Ord. 17-O-2724, eff. 2-10-2017)