I think you're going to have to wait for the owner to figure out what they are going to do about the tenant. Patience is what you need. Or . . . you can buy the house with the current tenant and deal with the eviction process yourself. As a property manager I strongly urge you to forego this choice and just wait out the eviction process the current owner will be going through. Maybe the bank is still within their timeframes for using less confrontational eviction methods than simply posting a notice. Perhaps the seller is taking eviction action you are not aware of. Ask your realtor to give you concrete information about where the seller is in the eviction process.