Just prior to shift change a box alarm was struck for 44105 Rising Sun Terrace for the townhouse. T606 staffed with 5 volunteers added onto the run and assumed 2nd due special service. E623 marked on-scene with heavy fire showing from an end of the row unit with extension on the bravo side and struck a 2nd alarm. T606 gained entry to the exposure conducted a primary search, ventilated, and opened up to find heavy fire in the attic. E606 stretched a hand line to knock all fire in the exposure. The truck from 6 remained on-scene for approx 3 hours assisting with checking for extension and extensive overhaul.