Section 89.143 - Zoning law to allow certain facilities1. Any zoning law, ordinance or code enacted on or before August 28, 1990, by the governing body of any county, or any city, town or village containing a population of more than five hundred persons, as determined based upon the last previous decennial census of the United States, shall contain or be modified to contain appropriate provisions establishing as a permissive, conditional, or special use, the location and use of buildings, structures and land as residential or outpatient facilities for the treatment of alcohol and other drug abuse.2. Any county, or such city, town, or village which fails to modify its zoning law, ordinance or code by January 1, 1991, to provide for classification as set out in subsection 1 of this section shall be deemed to have adopted the classification of commercial or an equivalent classification for such treatment facilities.3. If a county, or such city, town, or village, initially adopts a zoning ordinance or code after August 28, 1990, it shall contain appropriate provisions establishing as a permissive, conditional, or special use, the location and use of buildings, structures and land as residential or outpatient facilities for the treatment of alcohol and other drug abuse. If such a zoning law, ordinance, or code does not contain such provisions, the county, or such city, town, or village shall be deemed to have adopted the classification of commercial or an equivalent classification for such treatment facilities.4. The local zoning authority may require that the exterior appearance of the facility and property be in reasonable conformance with the general standards in the area. Further, the local zoning authority may establish reasonable standards regarding the density of such residential treatment facilities in any specific neighborhood.