We got to see a forclosed house yesterday, two of them actually. Realtor opened the door and walked in the first one and before I stepped in the door I said "look al the mold" and then she noticed the mold everywhere. I could see a collasped ceiling in one of the back rooms, my guess is someone turned the water on upstairs before they left and just let it flood.
Second one was nice and didn't need much work but there were already bids on it so we passed.