The Social Security Administration (SSA or the agency) is seeking firms interested in providing multi-discipline Architect and Engineer (A-E) services on a nationwide scale (throughout the United States and its territories). SSA intends to negotiate a single-award, indefinite-delivery/indefinite-quantity (IDIQ) contract with an A-E firm that the agency determines is the most highly qualified/most preferred in accordance with 40 U.S.C. chapter 11, Selection of Architects and Engineers, and part 36 of the Revolutionary Federal Acquisition Regulation (FAR) Overhaul (RFO). Firms will be evaluated on their demonstrated competence and qualifications for the required work provided in this announcement. The pre-solicitation number is 28321326R00000018.