(a) The commissioners court of a county may conduct a closed meeting to deliberate business and financial issues relating to a contract being negotiated if, before conducting the closed meeting:
(1) the commissioners court votes unanimously that deliberation in an open meeting would have a detrimental effect on the position of the commissioners court in negotiations with a third person; and
(2) the attorney advising the commissioners court issues a written determination that deliberation in an open meeting would have a detrimental effect on the position of the commissioners court in negotiations with a third person.
(b) Notwithstanding Section 551.103(a), Government Code, the commissioners court must make a recording of the proceedings of a closed meeting to deliberate the information.