I'm drealing with a similar issue. Let me know what you find out
I am not aware of any such stipulation, but am not an expert.
I do know that in the absence of a written agreement, and verbal or expired agreements are effectively month-to-month agreements. So you have until the 10th of any month to give notice of ending the contract by the end of the month (20 days notice, truly).
What I would do in that situation is draft and mail the 20 days notice, post and mail a 3 day pay or quit for unpaid rent, then feel them out for what they need to get moved out ASAP (cash for keys). If you serve legally, worse case you should have the property back by the end of the month and potentially sooner.
If the property is in King County they have their own laws that I am not up to speed on. And, this assumes you have the tenants names, that might complicate things.
The rental agreement was with the tenant that passed. Unless the deceased had written authorization to transfer the lease to another party, these people are basically squatters.
Your first step should be for the Seller to speak with them. Notify them they are not legal residents, the house is for sale, and they have XX days to vacate. That should work. If they refuse, then you'll have to go through the eviction process.
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