Tex. Local Government Code § 375.163

(a) Property that comprises three or more acres, separated only by streets or public rights-of-way, that was used primarily for recreational, park, or scenic use during the immediately preceding calendar year and on which money has been spent for landscaping at any time in an amount that is equal to the lesser of five years of proposed district assessments on the property or the proposed amount of the district's assessments on the property pursuant to a plan of assessment adopted by the board is exempt from assessment by the district, except with consent of the owner of the property.

(b) Property is exempt from assessment by the district under this section during the period that the property is used primarily for recreational, park, or scenic use in accordance with this section.

(c) The fact that property is exempt from assessment by the district may not be construed to be an express or implied dedication of the property to the public for recreational, park, scenic, or other public use or constitute evidence of an intent by the owner of the property to make or offer to make that type of dedication and does not affect the status of the property as private property.

(d) If the district levies ad valorem taxes, property that qualifies for an exemption from assessment under this section must be taxed by the district at its appraised value for recreational, park, or scenic use determined in accordance with Subchapter F, Chapter 23, Tax Code.