I actually didn’t mean it would ‘destroy the building’. I was thinking more like, you know, clothes get the FILTHY flag, electronics get ruined, there are more insect spawns as a result of rotting furniture, etc.
Without human intervention, a sprinkler system would just keep running as long as it’s able to. This would create flooding in some capacity. I don’t mean waist-deep water on every floor, I just meant the aftermath of a building being exposed to large amounts of water and gravity.