Many of the people using an LLC (or multiple LLCs) aren't using them properly and are just as vulnerable as if they had never set on up.

Their jealous of the Chinese guy who owns the building and they want to take a shot at you.You wrote:"My insurance company sent me a special message and warned me not to rent the house to the tenant with 6 types of dogs, pitbull is one of them"And if you go against the terms of your insurance contract they may cancel your policy, and that's going to start a series of other problems.Take a stand NOW otherwise you will be vulnerable to such attacks in the future.Let this PROBLEM be an OPPORTUNITY for you and ask people here for a good PM.When you get a few people to interview present THIS issue and ask them to advise you:1) right there on the spot.2) in 24 hours, ie after they've been able to reach out to their own sources for the best way forward.W,

This would seem a logical extension of that to educate and counsel sellers who are vulnerable to being taken advantage of.

I understand the desire to protect vulnerable residents, but punishing those very people and entrepreneurs who want to increase housing supply in Portland is not going to help anyone.  

Anyone with a lot of cash and under pressure to do a  deal is in a vulnerable position, and having that knowledge cuts down the extent of how vulnerable you are.

Seem a vulnerability to them in their methodology.  

My explanation was more for the benefit of other folks who might be "vulnerable" to accidentally investing themselves into a job;) Yes those micro units are intriguing to me.

This may be a vulnerable area that is allowing water to enter the crawl space.

If the building were to go up in flames, I would just take the cash and walk away. 

Professional landlord" is not a tax term, so I am not positive about what your CPA meant by that.I mentioned a single-LLC setup but he said that that would leave my houses just as vulnerable since they exist in the same corporate entity.