Use a commercial lease if you are renting an office building, retail space, restaurant, industrial facility, or real estate in which the tenant will operate a business. A lease (or lease) is a document explaining the conditions under which a tenant rents a residential or commercial property from a lessor. The lease does not need to be attested (although it is always recommended to have at least one). At the time of authorization, landlords and tenants must exchange the following: To see a lease concluded, see our sample lease completed. The following standard lease agreement for residential buildings works for all states except California, Florida, and Washington, DC.