Oregon Revised Statutes Education and Culture § 358.528

When any property has been classified and specially assessed as historic property under ORS 358.487 to 358.543 and the owner or other qualified person applies for a change in the classification under another special assessment program, the applicant shall have 30 days thereafter within which to withdraw the application, by giving written notice to the public official or agency to whom the applicant applied for the change in classification. If no notice of withdrawal is given by the applicant, the application shall be acted upon and the change in classification made, as otherwise provided by law.