Oregon Revised Statutes Education and Culture § 358.499

(1) Property first classified and specially assessed as historic property for a tax year beginning on or before July 1, 1994, shall continue to be so classified, specially assessed and removed from special assessment as provided under ORS 358.487 to 358.543 as those sections were in existence and in effect on December 31, 1992.

(2) Property may be classified and specially assessed under ORS 358.487 to 358.543 pursuant to application filed under ORS 358.487 on or after September 9, 1995, and first applicable for the tax year 1996-1997 or any tax year thereafter.

(3) Property may not be classified and specially assessed pursuant to application filed under ORS 358.487 or 358.540 if the application is filed on or after July 1, 2020.