48 CFR 36.103: 36.103 Methods of contracting.

(a) The contracting officer shall use sealed bid procedures for a construction contract if the conditions in 6.401(a) apply, unless the contract will be performed outside the United States and its outlying areas. (See 6.401(b)(2).)

(b) Contracting officers shall acquire architect-engineer services by negotiation, and select sources in accordance with applicable law, subpart 36.6, and agency regulations.