Provides that a person may acquire title to real property by adverse possession only if: (1) The person has maintained actual, open, notorious, exclusive, hostile, and continuous possession of the property for the period set forth in RCW 4.16.020;

(2) The person has made or erected substantial improvements upon the property at issue and such improvements have remained on the property for at least ten years;

(3) The person owns property that is contiguous to the property at issue; and

(4) The person proves each of the elements set forth in this section by clear and convincing evidence.