What caused a fire that destroyed a vacant house in Stanford on Monday? Investigators say they don't know. Crews got the call around 12:30 Monday morning, and arrived to find smoke and flames throughout the building. It didn't take long to put the fire out, but it did take long to put out the hotspots, as they said the roof had collapsed. The empty house was for sale through the previous owners' estate. Even though investigators went back yesterday, they still couldn't find what caused the fire.