Any additional due diligence questions or red flags I should look out for. since its my first time to invest in multifamily3.

It was left up.This particular individual would have really went off and done personal attacks if anyone would have been bold enough to challenge what he was doing openly.

More secure and stable than an STR (also less competition) but you aren't in the red like you'd be with an LTR. 

Both the daughter and Dad have excellent credit history but feel this is a red flag. 

They city will red tag it and require you to upgrade everything and get a Certificate of Occupancy before you can rent it.

I am also following your opinion and analysis as well.You were said before that you met this hedge fund guy (or whatever) that their AUM is hundred times more than your AUM correct, but while you able to manage your portfolio and management, their portfolio is all at red. 

Heck go to the casino and put it on roulette wheel of black or red. 

MInut has a low average review (mid-3s I think) on Amazon which is a bit of a red flag. 1 per room at a total of $60/month sounds excessive for something that is not likely to be a common occurrence. 

Major red flag for me that they won't give you one.

I've seen and heard so much blindly bold and terrible strategy from people who have never done a deal, but just paid someone an ungodly amount of money to teach them a strategy that puts more money in the pocket of their "mentor."