I don't know the guy personally.

Especially during the bear markets, basics are the most important KPI.Reduce the amount of personal cash in the deal.Ensure that the property can provide enough cashflow consistently to sustain itself Wait for the best time to sellNever, ever, nevereverever, put yourself in a position that forces you to sell at the worst possible time.

These products have no income, taxes, or personal liability limits tied to the loan.

I was wondering if I should set up another personal bank account for all activities.

As well as guest room in the main house.These properties are all personally owned and obviously highly leveraged.

2) Challenge is investors want everything for free, but you get what you pay for.

Personal Cash from previous flips How did you add value to the deal?

I am looking to borrow 50k from equity in a 4 unit investment property to use as a downpayment on a personal residence. 

Personally, I perceive a fair amount of risk in the market.  

A few things to keep in mind: the entire operation must be outsourced, and neither you nor your immediate family members can't be involved as you are considered "disqualified persons."