Part of the requirements for adverse possession in Oregon include maintaining "actual, open, notorious, exclusive, hostile and continuous possession of the property."
Actual, open, exclusive possession was maintained by WS (initials), then his heir DS, then her heir MP, then assigned by MP to a trust. https://law.stackexchange.com/a/92285 suggests that is "continuous."
But I do not know the meaning (in legal context) of "notorious." And it's not "hostile" in the general sense of the word, but for the purposes of the statute, "hostile" means "under claim of right or with color of title." The possession was not "with color of title" and probably not "under claim of right." They just were not aware that it wasn't officially their property.
Situation: Two commercial lots owner by "PCO" and "WRET" are to the north of a residential area which includes the WS/DS/MP lot. Many years ago, PCO and/or WRET built a wall separating their two properties from the residential lots. The WS/DS/MP lot is adjacent to the WRET lot. But according to county GIS, the wall is a considerable distance north of the property line. Since the wall was built (and possibly before), WS, DS, and MP have mowed, gardened, landscaped, and used the land all the way to the wall, unaware that it wasn't officially their property. WRET neither granted permission nor denied permission. (One might argue the act of building the wall implies permission.)
Can the trust have the boundary modified to include that strip of land by adverse possession or by some (what?) other principle?