North Brunswick Fire Dept. got dispatched to 229 Nathan Drive at 16:45 hrs. for a fire. Deputy Chief 310 arrived and had a heavy smoke condition. Chief 310 confirmed with responding companies a working fire. Chief 300 arrived and established command. Sq 3 on their arrival established a water source and stretched a line to the basement where the fire was determined to be. Eng. 105 arrived and stretched a backup line. Truck 209 on arrival was instructed to perform ventilation and primary search. The fire was contained to the basement and first floor.