NTIA’s recent guidance recommends that states investigate the connectivity status of BEAD-eligible MDUs beyond those listed as unserved on the FCC National Broadband Map. The map identifies multifamily housing developments as one Broadband Serviceable Location (BSL), which means it does not represent broadband availability of the individual units, significantly understating the number of unserved and underserved MDUs. NTIA’s BEAD Challenge Process Policy includes a BEAD Model Challenge Process that states can adopt in its entirety to complete Volume 1 of BEAD Initial Proposals.