Sublease Agreements are legal documents detailing the terms and condition of the lease of a property to a new tenant. We created this community to make the process of finding a new home, tenant, or roommate, just that bit easier.Provide proof of property ownership from the Broward County Property Appraiser's website. How to fill out the Sublease Agreement Form for Renting Property? A sublease agreement is a legal contract signed between a tenant and a third party allowing the latter to rent out the entire property or any part of it.