The chief purchasing officer shall sell or otherwise dispose of all property of the state which is not needed, or has become unsuitable for public use, or would be more suitably consistent with the public interest for some other use, as determined by the chief purchasing officer. The disposal of real property shall be subject to the approval of the state properties committee and pursuant to the provisions of chapter 7 of this title. The determination of the chief purchasing officer shall be set forth in an order and shall be reached only after review of a written request by the agency desiring to dispose of the property. The request shall describe the property and state the reasons why the agency believes disposal should be effected. All instruments, required by law to be recorded, which convey any interest in any of the real property so disposed of shall be executed and signed by the acquiring authority pursuant to the provisions of chapter 7 of this title.