A recent survey shows that a house built in 1972 was built less than 3' from the property line. 5 years ago a deck was added (with permits) that has stairs that land a couple feet over the property line. Based on the mistaken assumption that that the deck was not over the line a patio and 2 foot high retaining wall was built that extended even further into the property. Plantings were added and all has been maintained by the encroaching neighbor for the past 5 years.
The encroached neighbor doesn't want to give up ownership of this land, but the encroaching neighbor also believes they have a right to keep things the way they are now and doesn't want to cooperate.
Can all this be removed at will?
How does the setback violation complicate this?
This is in Unincorporated King County