Upon the filing of an application for a conditional use permit or a variance as set forth in RCW 36.70.810, the board of adjustment shall set the time and place for a public hearing on such matter, and written notice thereof shall be addressed through the United States mail to all property owners of record within a radius of three hundred feet of the exterior boundaries of subject property. The written notice shall be mailed not less than twelve days prior to the hearing.
RCW 36.70.840