48 CFR 601.302: 601.302 Limitations.

(a) The FAR and the DOSAR apply to all DOS acquisitions of personal property and services, including construction, both within and outside the United States, unless expressly excluded by this subpart, or exempt from the Federal Property and Administrative Services Act of 1949, as amended (40 U.S.C. 474(7)), or undertaken pursuant to section 208 of the State Department Basic Authorities Act of 1956, as amended (22 U.S.C. 4308), or the Foreign Service Buildings Act of 1926, as amended (22 U.S.C. 292 et seq.).

(b) At posts where Joint Administrative Offices have been formed and DOS is the procurement agency, the FAR and DOSAR apply to all administrative and technical support acquisitions.