On the roof trying to do ventilation work as fire raced through. The Fire Department telling us no one was hurt, and i had a chance to speak with a gentleman who said he owns the home and he is telling me the place was supposed to be empty. We talked with a neighbor and she described what she saw. I was driving up and they said the whole neighborhood was filled with smoke. You couldnt see anything, and it subsided a little and then it started again, only one engine was there and the others came right away. 4 reporter i spoke a short time ago with a man who said he owns this building and he said the place has been seized by bankruptcy courts, this comes a few years after the City Attorney filed a lawsuit describing this particular home as a drug house. And a nuisance in the neighborhood. This morning the place has caught fire, the San Francisco Fire Department will do a full investigation to figure out how it started. Cruise likely here for some time, on sanchez street off 18th. Firefig