43 C.F.R. § 4610.1-2
Where privately owned lands are offered for lease, the party offering them will be required to file with the local office of the Bureau of Land Management certificates from either the proper county officials, a licensed abstracter, or an administrative officer of the Bureau of Land Management whichever is required by an authorized officer, certifying that the records of the county in which the lands are situated show that the party offering the lands for lease is the record owner thereof or in legal control of such lands under appropriate recorded lease permitting the subleasing of the property, and including an itemized statement showing the nature and extent of any liens, tax assessments, mortgages, or other encumbrances.
43 C.F.R. §4610.1-2