The Washington State Advisory Council’s Standards for the Rehabilitation and Maintenance of Historic Properties in WAC 254-20-100 shall be used by the Commission as minimum requirements for determining whether or not an historic property is eligible for special valuation and whether or not the property continues to be eligible for special valuation once it has been so classified. [Ord. 4178 § 1, 2014; Ord. 3785 § 1, 2006; Code 1970 § 27.090.040.]