 Miguel F. Martinez, east to west, and from Baja California to Calle Primera, north to south.The focal point of the red light district, however, is the core block bordered by Calle Coahuila on the north and Primer Callejón Coahuila on the south between Constitucion and Niños Heroes.Prostitution is permitted in Tijuana's red light district, designated a "zona de tolerancia", or "tolerance zone."