The properties of the authority, both real and personal, are declared to be public
properties used for the benefit and welfare of the people of the State of Georgia,
and not for purposes of private or corporate benefit and income, and such properties
and the authority shall be exempt from all taxes and special assessments of any city,
county, or the state or any political subdivision thereof; provided, however, that
the provisions of this section shall not prohibit or inhibit the lease or use of authority
properties for private purposes which in the sole judgment of the authority support
the general purposes of the authority.