The class of properties eligible for special valuation pursuant to Chapter 84.26 RCW, as it now exists or is hereafter amended, shall be properties listed on the Bothell register of historic landmarks or properties certified as contributing to a Bothell register historic landmark district. (Ord. 2069 § 2 (Exh. B), 2011; Ord. 1635 § 1, 1996; Ord. 1484 § 1, 1992; Ord. 1258 § 1, 1987).