(a) The board may not finance a service or an improvement project with assessments under this chapter unless a written petition requesting that service or improvement is filed with the board.(b) The petition must be signed by:(1) the owners of a majority of the assessed value of real property in the district subject to assessment according to the most recent certified tax appraisal roll for Harris County; or(2) at least 25 owners of real property in the district, if more than 25 persons own real property in the district according to the most recent certified tax appraisal roll for Harris County. Acts 2003, 78th Leg., ch. 1277, Sec. 1, eff. April 1, 2005.Amended by: Acts 2005, 79th Leg., Ch. 728 (H.B. 2018), Sec. 18.004(k), eff. September 1, 2005.