RCW 47.14.030
RCW 47.14.030: Credit against transportation benefit district assessment.
The governing body of a transportation benefit district may give credit for all or any portion of any real property donation against an assessment, charge, or other required financial contribution for transportation improvements within a transportation benefit district established under RCW 36.73.020 or 35.21.225 . The credit granted shall be available against any assessment, charge or other required financial contribution for any transportation purpose which utilizes the donated property.