You will need possession for 7 consecutive years with other requirements met to achieve Adverse Possession in WA.
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I'm confused by your question. Are you on this property with any kind of claim of right, such as a deed, lease or title to the property, or are you just trying to do a "good deed" and "take over" a neighbor's "abandoned" property because you know he's fled to China because of criminal charges.
Counsel may be right about adverse possession and the seven year vesting period, but that's defeated if you're there under any claim of right, such as permission from the owner or a deed or lease. Moreover, one would presume that the owner would have to pay the taxes on the property or it would be sold by the municipality at auction...and it may be unclear whether an interloper such as yourself could pay the taxes or get the tax authorities to change the registered name for the tax bill. Perhaps you could bid at the auction, but probably other people could as well.
In any event, your right to be on the property at all at this time is murky. I don't know if I'd be sending registered letters to anyone. Consult with an attorney.
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I too am confused as to the nature of your claim. It may be for reimbursement of costs of preservation of property, although it could be read as a question about adverse possession. You need to put your documents in front of a lawyer for analysis. If your primary language is not English, make sure somebody who can serve as an interpreter can be present to assist with communication.