This document is a solicitation for the Fermilab Long Baseline Neutrino Facility (LBNF) Near Detector Complex Construction. The solicitation number is LBNF-ND-350921-BWQ. The Department of Energy Fermi National Accelerator Laboratory is seeking one subcontractor to perform the construction services for the LBNF Near Detector Complex at a firm fixed price. The scope of work includes constructing a service building, primary and secondary shafts, detector cavern, and site improvements. A mandatory pre-proposal conference will be held on July 10, 2024, and proposals will be due by August 8, 2024. The award is anticipated within 7 months of the proposal due date. FRA reserves the right to reject any proposals or cancel the solicitation. Offerors must attend the pre-proposal conference to be eligible for award.