Mo. Rev. Stat. § 99.120
An authority whose board members are appointed by one or more elected officials shall have the right to acquire by the exercise of the power of eminent domain any real property in fee simple or other estate which it may deem necessary for its purposes under sections 99.010 to 99.230 after the adoption by it of a resolution declaring that the acquisition of the real property described therein is necessary for such purposes. An authority may exercise the power of eminent domain in the manner provided for corporations in chapter 523. Property already devoted to a public use may be acquired in like manner, provided that no real property belonging to the city, the county, the state or any political subdivision thereof may be acquired without its consent.
§ 99.120, RSMo