At 21:07, we responded in to Princeton on the first alarm to assist the Princeton Fire Department at a structure fire, escalated to second alarm, on a three story complex on Billie Ellis Lane. We responded with Engine #4 and assisted with fire ground operations, including search, overhaul and cleaning. Upon arrival, the fire already consumed the third floor, developing into a structure fire as flames were tens of feet above the roof. Numerous companies responded to work this fire through the below freezing temperature and suppressed the fire through aerial master streams.