A taxpayer’s petition must be filed or postmarked by July 1 of the current assessment year or 30 days after the date of mailing the value change notice, whichever is later. If the petition is mailed, it must be postmarked by midnight of the deadline. Mail to: Board of Equalization, 207 4th Avenue N, Kelso, WA 98626. Please do not wait until the last day to file an appeal. Even if you are discussing your property with the Assessor’s Office, you must file timely to reserve your right to appeal. Phone calls, letters, word of mouth, etc. do not reserve your right to appeal. You must have your appeal turned in in order for your appeal to be considered.