The board, acting jointly with the State Inland Port Authority, is authorized to set aside, or lease all or portions of any lands, roads, docks, sheds, warehouses, elevators, compresses, floating dry docks, graving docks, marine railways, tugboats, or any other necessary or useful improvements constructed or acquired by it to individuals, firms, or corporations, public or private, for port, harbor, commercial or industrial purposes for a period not to exceed ninety-nine (99) years, or to execute a conveyance of sale on such terms and conditions and with such safeguards as would best promote and protect the public interest. Any industrial lease of lands or conveyance of sale may be executed upon such terms and conditions and for such monetary rental or other consideration as may be found adequate and approved by the board in orders or resolutions authorizing the same. Any covenants and agreements of the lessee or purchaser to make expenditures in determined amounts, and within such time or times, for improvements to be erected upon the land by such lessee or purchaser and to conduct thereon industrial and/or other operations in such aggregate payroll amounts and for such period of time as may be determined and defined in such lease or conveyance, and to give preference in employment where practical to residents of the State of Mississippi and to qualified residents of the city and the county in which such port or harbor is located, shall, if included in such lease or conveyance, constitute and be deemed sufficient consideration for the execution of any such lease or conveyance in the absence of monetary rental or other considerations; any such instrument may contain reasonable provisions giving the lessee the right to remove its or his improvements upon the termination of the lease.