Buying an occupied home in NW Washington

[Michael Anema]

My wife and I are looking into purchasing a sfh in Kitsap county Washington. It's currently occupied by tenants that are under a verbal contract. I've heard it said that the only way to remove tenants is if the home is sold, would that be my responsibility as the buyer? Or would that be the sellers responsibility? How does all that work?

The house needs major renovation and is renting for significantly less that market right now. Any help is appreciated, thanks!