12 U.S.C. § 13: Rooms for Currency Bureau

There shall be assigned, from time to time, to the Comptroller of the Currency, by the Secretary of the Treasury, suitable rooms in the Treasury Building for conducting the business of the Currency Bureau, containing safe and secure fireproof vaults, in which the Comptroller shall deposit and safely keep all the plates not necessarily in the possession of engravers or printers, and other valuable things belonging to his department; and the Comptroller shall from time to time furnish the necessary furniture, stationery, fuel, lights, and other proper conveniences for the transaction of the business of his office.