As used in this subpart:

Department or HUD means the Department of Housing and Urban Development, and includes a person authorized to act for HUD.

Office means the organization of each Assistant Secretary of HUD or other HUD official at the Assistant Secretary level, and each Field Office.

Office of Appeals or OA means the HUD Office of Appeals within the HUD Office of Hearings and Appeals.

Secretary means the Secretary of HUD.

Treasury means the Department of the Treasury.

United States includes an agency of the United States.