Sec. 293.003.  COUNTIES SUBJECT TO CHAPTER.  This chapter applies only to a county that:
(1)  has a population of more than 600,000;  and
(2)  owns and uses, together with other structures, a courthouse that is more than 30 years old and that has not been completely renovated or remodeled during the preceding 30 years.
Acts 1987, 70th Leg., ch. 149, Sec. 1, eff. Sept. 1, 1987.