The Department has the power to provide for the relocation of all persons and entities displaced by the development of the South Suburban Airport. Except when federal funds are available for the payment of direct financial assistance to persons displaced by the acquisition of their real property, the Department shall pay to displaced persons reimbursement for their reasonable relocation costs, determined in the same manner as under the federal Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970, and as implemented by rules adopted under that Act.