(a) A county may not demolish, sell, lease, or damage the historical or architectural integrity of any building that serves or has served as a county courthouse without notifying the commission of the intended action at least six months before the date on which it acts.
(b) If the commission determines that a courthouse has historical significance worthy of preservation, the commission shall notify the commissioners court of the county of that fact not later than the 30th day after the date on which the commission received notice from the county. A county may not demolish, sell, lease, or damage the historical or architectural integrity of a courthouse before the 180th day after the date on which it received notice from the commission. The commission shall cooperate with any interested person during the 180-day period to preserve the historical integrity of the courthouse.