Wash. Admin. Code § 458-15-060
Upon receipt from the board of documentation that the property is an eligible historic property and the agreement between the applicant and the board, the assessor shall:
(3) The assessor shall calculate and enter on the assessment rolls a special value each succeeding year. The property shall receive the special valuation until:
[Statutory Authority: RCW 84.08.010(2) and 84.08.070. WSR 87-05-022 (Order PT 87-2), § 458-15-060, filed 2/13/87.]