(a) The legislature by general law may authorize the board of trustees of an independent school district to donate district real property and improvements formerly used as a school campus for the purpose of preserving the improvements.
(b) A law enacted under this section must provide that before the board of trustees may make the donation, the board must determine that:
(1) the improvements have historical significance;
(2) the transfer will further the preservation of the improvements; and
(3) at the time of the transfer, the district does not need the real property or improvements for educational purposes.