Tennessee Code Title 7. Consolidated Governments and Local Governmental Functions and Entities § 7-84-810

(a) An infrastructure development district established pursuant to this part created by one (1) or more host municipalities may embrace two (2) or more separate property areas.  The jurisdiction of a host municipality to make and provide, finance, and levy assessments for infrastructure costs within a district is not impaired by a lack of commonness, unity, or singleness of the location, purpose, or character of the infrastructure, or by the fact that any one (1) or more of the properties included in the district are subsequently determined not to be benefited by such infrastructure, or by a particular portion of the infrastructure, and is not assessed for such infrastructure costs.

(b) The creation or existence of a district is not subject to challenge if any of the projections of capital costs or other matters contained in the petition are not achieved.