A New York Adverse Possession Affidavit is a legal document used to establish the right of possession of a piece of real estate through the legal doctrine of adverse possession. This document is used to establish the fact that the person claiming the property has been in exclusive, continuous possession of the property for a period of at least 10 years. The affidavit must include a detailed description of the property, the date the possession began, and a statement that the possession has been continuous and exclusive. The two types of New York Adverse Possession Affidavit are the Possession Affidavit and the Statutory Adverse Possession Affidavit. The Possession Affidavit is used when the person claiming the property is in possession of it and needs to establish proof of adverse possession. The Statutory Adverse Possession Affidavit is used when the person claiming the property is not in possession and needs to establish proof of adverse possession. Both affidavits require the claimant to provide proof of possession and occupancy of the property for at least 10 years in order to be valid.