31 CFR § 11.3 - Definitions.
Terms used are defined in 34 CFR 395.1, except that as used in this part, the following terms shall have the following meanings:
(a) Department of the Treasury controlled property means any Federal building, land, or other real property owned, leased, or occupied by a bureau or office of the Department of the Treasury, of which the maintenance, operation, and protection is under the control of the Department of the Treasury.
(b) The term bureau means any bureau or office of the Department of the Treasury and such comparable administrative units as may hereafter be created or made a part of the Department, and includes the Departmental Offices and the Office of Inspector General. The “head of the bureau” for the Departmental Offices is the Deputy Assistant Secretary (Administration).