Wash. Admin. Code § 458-14-066
(2) Valuation information provided by assessor. Requests by a taxpayer for valuation information from the assessor may be made on the petition form filed with the board, or may be made at any reasonable time prior to the hearing. Upon request by the taxpayer, the assessor must make available to the taxpayer the comparable sales used in establishing the taxpayer's property valuation. If valuation criteria other than comparable sales were used, the assessor must provide the taxpayer with the information.
All valuation information, including comparable sales, must be provided to the taxpayer and the board within sixty calendar days of the request but at least twenty-one business days, excluding legal holidays, prior to the taxpayer's appearance before the board of equalization. The valuation information provided by the assessor to the taxpayer must not be subsequently changed by the assessor unless the new evidence supports the assessor's valuation. If the assessor has found new evidence, he or she must provide the additional evidence to the taxpayer and the board at least twenty-one business days, excluding legal holidays, prior to the board hearing. The postmark date is used to determine whether the information is timely provided.
(4) Failure to comply. If either the assessor or taxpayer does not comply with the requirements of this rule, the board may take any of the following actions:
(b) If there is an objection by either party to the failure of the other party to comply with the requirements of this rule, the board may:
[Statutory Authority: RCW 84.08.010, 84.08.070, and 84.48.200. WSR 18-24-109, § 458-14-066, filed 12/4/18, effective 1/4/19; WSR 06-13-034, § 458-14-066, filed 6/14/06, effective 7/15/06; WSR 95-17-099, § 458-14-066, filed 8/23/95, effective 9/23/95; WSR 90-23-097, § 458-14-066, filed 11/21/90, effective 12/22/90.]