OIG recommends that the Bureau of Overseas Buildings Operations (OBO), in coordination with the Bureau of Administration, assess time as part of their independent government cost estimate process and evaluate and respond to the Time Impact Analysis (TIA) prepared by the contractor for all outstanding requests for proposals to the New Embassy Compound Mexico City, Mexico, project when preparing an independent government cost estimate. In accordance with the Federal Acquisition Regulation and Department of State policy, OBO, in collaboration with the Bureau of Administration, must (1) prepare a prenegotiation memorandum and a findings of fact that include TIAs, (2) issue a decision on the prenegotiation memorandum, (3) proceed with negotiations, including discussion of the TIAs, with the goal of a fair and reasonable settlement for the change, and (4) report the results of the negotiations to the Contracting Officer, including recommendations for a fair and reasonable settlement that include any schedule extensions for the change.