Section 197.670 - Zoning requirements and prohibitions for residential homes and residential facilities(1) As of October 3, 1989, no city or county shall: (a) Deny an application for the siting of a residential home in a residential or commercial zone described in ORS 197.665 (1).(b) Deny an application for the siting of a residential facility in a zone where multifamily residential uses are allowed, unless the city or county has adopted a siting procedure which implements the requirements of ORS 197.667.(2) Every city and county shall amend its zoning ordinance to comply with ORS 197.660 to 197.667 as part of periodic land use plan review occurring after January 1, 1990. Nothing in this section prohibits a city or county from amending its zoning ordinance prior to periodic review.