"We've got three commercial fire hoses on every floor," he
  said. "We've got three CO2 bottles, big ones, on every
  floor. When we did the building originally, we thought we
  have enough equipment at the time, so the fire will never
  transfer to another unit. We have 45-minute fire doors, so
  if we have a fire, we can keep it to one unit."

  ...

  "Solid, concrete and pre-stressed -- it’s the best.” said
  Schmidt. It was designed to accommodate natural, tradewind
  ventilation, but he thinks those winds also helped to feed
  the fire.