Based on what we know and found out from neighbors, although we don't have any abstract evidence, Tenants were misusing the property to run a Prostitution type of business, massages service etc.

When she couldn't get any takers, her postings and messages just got more and more weird as the night went on.Admins finally blocked her and removed her posts, but I got to see them later when she tried to admit them as evidence in the Discrimination case she later filed against me.  

These TV shows have subverted what many Americans come to expect in evidence.

(b) The information referenced in paragraph (a) must not be entered into any shared database or provided to any person or entity but may be used when required as evidence in an eviction proceeding, action for unpaid rent or damages arising out of the tenancy, claims under section 504B.178, with the consent of the tenant, or as otherwise required by law.Subd. 3.Liability for rent; termination of tenancy.

If ONE unit is vacant and both units are equal in rooms/bathroom composition, then the new owner will need to move into the vacant unit and then the owner can either evict to take the occupied property completely off the rental market (5 years off the rental market), evict to take back the occupied unit for personal use like moving in immediate family (2  years off the rental market), or they can evict given the tenant is a nuisance or conducting illegal activity (this is a harder method to evict since you have to provide evidence and have a case but if they're selling drugs and you have video footage or something, then make your moves) and there are a few other reasons for at-fault evictions. 

That gets read into evidence, and the jury in the civil case looks at you and self-righteously decides to break you as a warning to all heedless, neglectful, negligent, arrogant young real estate investors.

We are a group of Latin American investors who are experiencing economic losses due to the irresponsibility of ABC Capital.We have found on the public page www.courtlistener.com two actions where our office of trust in real estate investments and property manager, to whom we entrust our investment and assets, are sued.We put at your disposal both actions; with the warning that they should not prejudge, since it will be the court that hears the case who passes sentence, since it is the one that knows the evidence presented.https://www.courtlistener.com/?

So, ignore all the anecdotal evidence and instead look at the hard facts (e.g., sales prices adjusted for inflation) before you draw your conclusions. 

When I could get them on the phone it was evident their utopian Idea of owning rentals was skewed very far from reality. 

The only evidence they provided is an email from the employer that said the man was fired.