41 C.F.R. § 102-75.670
After receiving the disposal agency's assignment letter, the Secretary of the Interior must provide the disposal agency with a Notice of Proposed Transfer within 30 calendar days. If the disposal agency approves the proposed transfer within 30 calendar days, the Secretary may proceed with the transfer. DOI must take all necessary actions to accomplish the transfer within 15 calendar days after the expiration of the 30-calendar day period provided for the disposal agency to consider the notice. DOI may place the applicant in possession of the property as soon as practicable to minimize the Government's expense of protection and maintenance of the property. As of the date the applicant takes possession of the property, or the date it is conveyed, whichever occurs first, the applicant must assume responsibility for care and handling and all risks of loss or damage to the property, and has all obligations and liabilities of ownership. DOI must furnish the disposal agency two conformed copies of deeds, leases, or other instruments conveying property under 40 U.S.C. 550(e) and related documents containing reservations, restrictions, or conditions regulating the future use, maintenance or transfer of the property.
41 C.F.R. § 102-75.670