76-2-310. Extension of municipal zoning and subdivision regulations beyond municipal boundaries -- termination of authority for extension. (1) A city or town council or other legislative body that has adopted a growth policy pursuant to chapter 1 or a land use plan pursuant to chapter 25 for the area to be affected by the regulations may extend the application of its zoning or subdivision regulations beyond its limits in any direction subject to the following limits:

(a) up to 3 miles beyond the limits of a city of the first class as defined in 7-1-4111;

(b) up to 2 miles beyond the limits of a city of the second class; and

(c) up to 1 mile beyond the limits of a city or town of the third class.

(2) (a) The authority granted to a city or town to apply zoning beyond its limits pursuant to subsection (1) is terminated when the county in which the city or town is located adopts zoning regulations for the area pursuant to Title 76, chapter 2.

(b) The authority granted to a city or town to apply its subdivision regulations beyond its limits pursuant to subsection (1) is terminated when the county in which the city or town is located adopts subdivision regulations for the area pursuant to Title 76, chapter 3.

(3) When two or more noncontiguous cities have boundaries so near to one another as to create an area of potential conflict in the event that all cities concerned should exercise the full powers conferred by 76-2-302, 76-2-311, and this section, then the extension of zoning or subdivision regulations, or both, by these cities must terminate at a boundary line agreed upon by the cities.