At the foreclosure auction ownership of the property passes to the new buyer, which in most instances is the bank itself. At that point you will technically be trespassing. That is one of the reasons why, by law, the owner receives a 90 day notice of trustees sale.
At that point the new buyer might start the eviction process and very soon you might have the sheriff knocking on your door to remove you and all your property from the premises. My advice is not to risk it, and try to vacate by the auction date.
Carlos J RamÃrez, PC, ABR, CNE
Associate Broker, HomeSmart -