The proceeds of the bonds, other than refunding bonds, remaining after paying the expenses of their sale and issuance shall be turned into the State Treasury, shall be carried in a special fund to be designated the Mental Health Facilities Building Fund, and shall be subject to be drawn on by the authority for the purpose of paying costs of acquisition, construction, improvement and equipping of mental health facilities in the state.

For the purposes of this article, the improvement of a facility shall be deemed to include the renovation, modernization, remodeling, and equipment thereof and the construction of additions thereof, and the construction of a facility shall be deemed to include the acquisition of real estate sites and equipment therefor. For purposes of this article, equipment shall mean any item of personal property having an estimated useful life of at least 10 years.

The preparation of all plans and specifications for any building, or capital improvements to a building, constructed wholly or in part with any of the proceeds from the sale of the bonds and all work done hereunder in constructing buildings and capital improvements thereto shall be supervised by Alabama Building Commission, or any agency that may be designated by the Legislature as its successor. All work done in the construction of buildings and all purchases of equipment shall be made on the basis of competitive bidding in the manner provided by law. Any moneys remaining on deposit in the Mental Health Facilities Building Fund shall, upon completion of the acquisition and construction of mental health facilities and the payment of all costs in connection therewith, be applied either to redemption of bonds on the earliest date on which they are by their terms subject to redemption or otherwise utilized by the authority in connection with the refunding of bonds.