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Adverse possession is not automatic. The claimant has to file a lawsuit entitled Complaint to Quiet Title, which is a type of pleading filed to initiate a lawsuit that deals with claims to ownership of the land, and includes claims of adverse possession. To see a sample complaint, click HERE and scroll down to page 6. However, while this is a complaint to quiet title, it does not argue adverse possession - I just wanted you to see what such a complaint would look like. You would have to draft the complaint from scratch to argue adverse possession.
Adverse possession requires that the ownership was (1) continuous, (2) hostile (3) actual, (4) open, notorious and exclusive, and (5) under claim of title inconsistent with that of the true owner for a period of 20 years.
Let me know if you need to know how to FILE/INITIATE the complaint with the Court.
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