In the not too distant past every issue of mildew instantly caused "health problems" in tenants. 

I know people can be found on the Internet but it is always good to be as distant as possible.

You should remain emotionally more distant than that.  

Income have to be verifiable.Criminal record : No felony convictions, no violent crimes convictions in the pastEviction record: No evictions in the past (we may consider person who has eviction in the distant past ONLY if it was paid off), no history of property damages from previous rentals.Credit report: No accounts more than 60 days past due (unless it is medical bills or student loans)Positive references from both current and past landlordsPet approval:Cats : We allow domestic well trained well cared for indoor cats.

Income have to be verifiable.Criminal record : No felony convictions, no violent crimes convictions in the pastEviction record: No evictions in the past (we may consider person who has eviction in the distant past ONLY if it was paid off), no history of property damages from previous rentals.Credit report: No accounts more than 60 days past due (unless it is medical bills or student loans)Positive references from both current and past landlords Pet approval:Cats : We allow domestic well trained well cared for indoor cats.

My goal is to one day in the not to distant future provide a comfortable living for my wife and children that will allow my wife and I to never work again outside of our real estate investments. 

Seems though from the tone of the article that the people have landlords that are impersonal and/or distant.  

Crap, find myself agreeing with Sue again ;)Don't know why, but whenever I hear of a new landlord and the first thing they want to do is increase the rent, a cold shiver goes down my back.If you want to introduce yourself do what we do, take one evening to go knock on each door and say hello, rather than a horrible impersonal letter.We make it a priority as well - we close on a unit or units, and we introduce ourselves that day, or maybe just before closing with the outgoing landlord.Sending a letter is just.....distant.

"I don't see 6% over the top".If you were to buy this strip center the issue you may face in the not to distant future is that the "under market" rents are no longer under market, and in addition to tenants either being driven out of business because they can no longer pay the rent or just flat out move (and don't be fooled they will) you'll experience significant vacancies. 

There is a good chance I will be interested in buying this property from him in the not to distant future, likely within my SDIRA, but possibly not within my SDIRA.