Owners of rental properties (single family homes, duplexes and condo units) in the City of Dallas will be required to register their properties annually. Like any other contract, a lease cannot be changed in the middle of the lease term unless both parties agree.Have them draft your first lease and request it on Word. Use a Dallas residential lease agreement to highlight the terms of a landlordtenant relationship and explain each party's responsibilities. The first step in creating a rental lease agreement in Dallas, Texas, is identifying the parties involved. You can list all the rental properties on the second page of the "Rental Affidavit" that you intend to register under one owner. All individuals over the age of 18 MUST fill out a separate application if they will be living on the property. Understand your responsibilities. Under Texas law, someone is a tenant if they have entered into a lease that allows them to live in a home. A lease can be written or oral.