This document is a draft Request for Proposals (RFP) for the construction of the Near Detector Complex at Fermilab's Long-Baseline Neutrino Facility (LBNF) project. The RFP seeks bids from contractors to provide general construction services, including all labor, materials, and equipment, for a service building, primary and secondary shafts, detector cavern, and site improvements. The work is to be performed under a Firm Fixed Price subcontract. The RFP requires a mandatory pre-proposal conference on July 10, 2024, and all questions from offerors must be submitted by August 8, 2024. The anticipated award date is 7 months from the proposal due date. The Department of Energy's Fermi National Accelerator Laboratory is the contracting agency. Offerors that do not attend the pre-proposal conference will not be eligible for award.