The leasing of the property shall be for not more than 50 years under stringent restrictive limitations as to use, the style and character of the structures allowable thereon, and such other limitations as the authority may deem wise; and all such restrictions shall be incorporated in the leases as covenants providing for forfeiture upon breach. No sublease by any tenant of the authority shall be legal without the approval of the authority.
(Ga. L. 1962, p. 736, § 8.)