There are dozens of films about firefighters and firefighting, including many documentaries, silent movies and comedies. In other words, as long as movies have been made, firefighting has been one of the subjects.
Even for a TV movie, this one gets our vote. The movie is based on true events that occurred in May 1988 when the Los Angeles First Interstate Bank building caught fire. At the time it was the tallest building in the city. Smoke alarms were not working properly, which allowed the fire to grow until it was uncontrollable.