Tex. Gov't Code § 1501.207
A district may sell to a municipality, and the municipality may buy, district property only if the purchase price paid, when added to other applicable money of the district, is sufficient to provide for the payment of:
(1) all outstanding district bonds, including interest on the bonds to:
Added by Acts 1999, 76th Leg., ch. 227, Sec. 1, eff. Sept. 1, 1999.