FAR 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.
Source: acquisition.gov — FAR
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