If you want them to leave, provide them legal notice to leave.

Do not rely on it for legal advice.

Chris summarized it perfectly.

Comments like "this area has nothing else like this" and "it just flows so perfectly from room to room" confirm that following what the house called, not what the area called, worked! 

.: I haven't passed this past legal review so for what its worth: Part of my standard requirements for everyone include income is at least 3X rent, minimum credit score, say 640, Clean record and no evictions as well as deposit is paid in full at signing of lease and 1st month rent is paid in full prior to handing over the keys.

Finding an investor-friendly agent is key and they should be able to help you with 1-4, I'd say talking about those questions you asked would be the perfect thing to ask any potential agents you interview! 

Any type of investment real estate anywhere in the US can be sold and replaced by any other type of investment real estate of any number of properties anywhere in the US.Washington to CA is perfectly fine.  

An LLC is useful for two things: anonymity and legal protection.

Is there any legal action one can take or is it just a lost cause?

And the market was perfect for investing at that time.