All building permits for affordable units qualifying a housing development for a density bonus shall be issued concurrently with, or prior to, issuance of building permits for the market rate units, and the affordable units shall be constructed concurrently with, or prior to, construction of the market rate units. Occupancy permits and final inspections for affordable units qualifying a housing development for a density bonus shall be approved concurrently with, or prior to, approval of occupancy permits and final inspections for the market rate units.