(a) Each county board may receive a donation of any:
(1) School land;
(2) School site; or
(3) Suitably located house adapted to school purposes.
(b) A county board may not improve any site or occupy any house donated under this section until it has acquired either a valid title to the property or a leasehold interest in it for a term longer than the probable useful life of the proposed improvement to the site or of the house donated.