Thinking about buying a house in the Dallas area? In Texas, a typical option period lasts between 7 and 10 days, though the actual duration varies based on negotiations between buyers and sellers.Use this calculator to help you determine your monthly car loan payment or your car purchase price. Pay your Tarrant County tax bill, search for an account, sign up for paperless billing, see payment options and local Truth in Taxation Request a management proposal today! Simply fill out the form below! Partnerships. Take advantage of webinars to build up CEHs for recertification. ISM—Dallas has partnered with ProPurchaser. Protections contained in the legislation that created our existing MMDs. At Real Property Management Legend, we protect your investment, minimize your costs, and maximize your income—without interrupting your daily life.