Oregon Revised Statutes Public Health and Safety § 456.145

(1) An authority may acquire, by the exercise of the power of eminent domain, any real property which it deems necessary for its purposes after 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 in the laws of this state for the condemnation of lands or rights of way by public or quasi-public corporations for public use or for corporate purposes; or in the manner provided by law for the appropriation of real property, or rights therein or thereto, by private corporations; or in the manner provided by any other applicable statutory provisions for the exercise of the power of eminent domain.

(2) Property already devoted to a public use may be acquired in like manner, but no real property belonging to the city, the county, the state or any political subdivision thereof may be acquired without its consent.