If, at the sale, one or more persons offer to purchase such property for not less than the amount of the minimum price, the property shall be declared to be sold to the highest bidder. If no person offers for such property at the sale the amount of the minimum price and the appropriate TTB officer has determined that the purchase of such property by the United States would be in the best interest of the United States, the property shall be declared to be sold to the United States at such minimum price. If, at the sale, the property is not declared sold to the highest bidder or the United States, the property shall be released to the owner thereof and the expense of the levy and sale shall be added to the amount of tax for the collection of which the levy was made. Any property released to the owner under these circumstances shall remain subject to any lien imposed by 26 U.S.C. chapter 64, subchapter C.
The appropriate TTB officer shall select whichever of the foregoing methods of offering the property for sale as is most feasible under all the facts and circumstances of the case, except that if the property to be sold includes both real and personal property, only the personal property may be grouped for the purpose of offering such property for sale. However, real and personal property may be offered for sale in the aggregate, provided the real property, as separate items, and the personal as a group, or as groups, or as separate items, are first offered separately.
27 C.F.R. §70.181
26 U.S.C. 6335