Wyo. Stat. § 15-9-223
Subsequent to the organization of an authority, additional property may be included in the development area. Proceedings for inclusion shall be initiated by petition to the board of the authority signed by the owner or owners in fee of each parcel of land adjacent to the existing area sought to be included. The petition shall include evidence satisfactory to the board concerning title to the property and an accurate legal description thereof. If the board approves the application, it shall submit the application to the governing body of the municipality. If the governing body also approves the application, it shall then, at a regular or special meeting, by amendment to the ordinance treating the authority, redescribe the development area so as to include the additional property as described in the petition. From the effective date of the amendment the additional property shall be included within the development area and shall be subject to any taxes thereafter imposed by the municipality for the use and benefit of the authority.
W.S. 15-9-223