Oregon Revised Statutes Property Rights and Transactions § 94.522

(1) A development agreement may be amended or canceled by mutual consent of the parties to the agreement or their successors in interest. The governing body of a city or county shall amend or cancel a development agreement by adoption of an ordinance declaring cancellation of the agreement or setting forth the amendments to the agreement.

(2) Until a development agreement is canceled under this section, the terms of the development agreement are enforceable by any party to the agreement.