They used a HELOC to finance a multi-family purchase, which allowed them to make staggered acquisitions and keep cash on hand for renovations.

He will be totally hands off and only role is to provide money.My goal is cash flow and another investment(same as my father).I have limited free cash on a tight budget but have access to a heloc loan for expenses if needed.

In most single family zoned areas adding a single ADU is not a value add meaning it will not add more value than the hands off cost of the addition.  

However, if both are desirable and available in your market, I would definitely choose smaller multifamily (1-4 units) hands down. 

Your question is akin to : " I have a hot fudge sunday in my hand, should I set it down and go look for a banana split".

Hey EvanI prefer hands off but I know that 2 heads are better than one.

There must be a lot of trading going on in the secondary mortgage markets, because so many of our loans have changed hands recently and it has been super annoying.

If it keeps getting out of hand then I would then send a notice to quit to the troubling tenant. 

When I used to have RE Broker in my title ( I still have the license just dont practice) I would get folks pinging me about Vegas about once a quarter or so and I would hand those leads to my Daughter  she made some pretty awesome connections from a few of those folks that bought multi million dollar homes..

Their clear incentive is to bet on falling interest rates between now and debt maturity.A small handful of owners are forced to sell due to a looming balloon payment that a refi won't cover, but you're not going to find one of those by driving the market when any commercial broker can just look up properties on that basis and start making calls.