48 C.F.R. § 570.402-5
If the contracting officer identifies potential acceptable locations through the advertisement or market survey, conduct a cost-benefit analysis following the procedures in 570.402-6. Based on the results of the cost-benefit analysis, take appropriate action as follows:
(b) If the cost-benefit analysis indicates that the Government cannot expect to recover relocation costs and duplication of costs through competition, prepare a justification for approval in accordance with FAR 6.3 and 506.3. Explain both:
[64 FR 37265, July 9, 1999, as amended at 76 FR 30852, May 27, 2011]