7-2-4111. Tax base -- maintenance agreements. When a city or town is incorporated, a county may, subject to 15-10-420, retain the property within the city or town as a part of the tax base of the county for purposes of levying taxes against the property for the maintenance of property within the city or town until the city or town imposes and collects a levy for maintenance of the property for which the county mill levy is imposed. The city or town and the county may enter into an agreement for maintenance of property pending an election on a city or town levy.