My question involves real estate located in the State of: Washington in King county. I live on about a third of an acre with a 6 acre parcel running adjacent to and behind my property. The neighbor that owned it put up a wire fence about 30 years ago which was about 50 feet wide and 100 feet long inside his property line. I have been maintaining this area for 20 years and constructed a small deck for yoga practice in this area 10 years ago. The neighbor has died and the property is for sale. Do I have any claim to this property?