Special Tax Valuation is the revision of the assessed value of a historic property which subtracts, for up to 10 years, such rehabilitation costs as are approved by the Mason County Historic Preservation Commission.

To be classified as eligible for special valuation in Mason County, a property must first meet the following criteria:

• It must be listed in the Mason County Register of Historic Places.
• It must be of a class of properties approved by the Mason County Historic Preservation Commission.

Eligible properties which undergo substantial rehabilitation may receive special valuation if the rehabilitation work is approved by the Mason County Historic Preservation Commission. The work must have been conducted within two years prior to application, and must be equal in cost to at least 25% of the assessed value of the structure prior to rehabilitation.

For more information on Special Tax Valuation, please refer to the Washington Department of Archaeology and Historic Preservation's Special Tax Valuation Pamphlet and Mason County Code 17.40.070.