What legal document establishes the terms of a rental agreement between a landlord and tenant?

The lease agreement is the legal document that establishes the terms of a rental agreement between a landlord and a tenant. This document outlines the rights and responsibilities of both parties, including the amount of rent, the duration of the tenancy, maintenance obligations, and policies on pets or guests. Importantly, the lease serves as a legally binding contract, providing clear guidelines for what is expected from each party during the rental period.

In contrast, the title deed is a document that shows ownership of real property and does not pertain to the rental relationship. The purchase agreement is focused on the sale of property rather than the rental, detailing the transaction between a buyer and seller. The mortgage document is a financial agreement between a borrower and lender related to real estate financing and does not involve the terms of a rental arrangement. Thus, the lease agreement is the correct answer, as it specifically regulates the landlord-tenant dynamic.