The Department of General Services (the "Department" or "DOS") submits this Request for Proposals ("RFP") to solicit design-build proposals ("Proposal(s)") from offerors or bidders ("Offeror(s)") interested in contracting to serve as the design-builder ("Design-Builder") for the Jefferson Middle School Modernization, located at at 801 7th Street, SW, Washington DC (the "Project").