27 CFR § 44.89
Separation of premises
April 24, 2020
Where the export warehouse premises consist of less than an entire building, the premises shall be completely separated from adjoining portions of the building, which separation shall be constructed of materials generally used in the construction of buildings and may include any necessary doors or other openings.
(72 Stat. 1421; 26 U.S.C. 5712)