The Director is specifically authorized to approve purchase, easement or long-term lease of properties from willing sellers for amounts not less than the fair market value and not more than the fair market value plus ten percent based on a current appraisal made pursuant to applicable federal law. (Public Law 91-646, Uniform Relocation and Real Property Acquisition Act, Final Rules, Federal Register Vol. 51 No. 39; page 7026 dated February 27, 1986 Subpart B (Real Property Acquisition) S. 102(d) Establishment and Offer of Just Compensation and (i) Administrative Settlement.)