I'm not saying that a 4-plex wouldn't be a good option, but I'd approach it a bit differently:Make sure that you have mastered personal finance, how to control both income and expense, manage risks by positioning your balance sheet with cash reserves, etc., and therefore as a result have some money saved.

to be fair and balanced you also have Mike H . promoting his service on almost every single thread about owner finance and sub too.. although he is more up front about it..

@Greg JungeYou certainly can - and should - invest your total Roth SDIRA account balance.

This assumes that you are not dipping into company money because your company is healthy and your personal balance sheet is healthy and you need a tax shelter or want to diversify your personal assets. 

Then the remaining mortgage balance on the new loan would be 52500.

By the way, Fannie Mae has a low balance multi family loan with a 15 year term.  

The HELOC has a monthly payment only if you put a balance on it. 

The program is not balanced. 

I'm balancing enjoying being involved in the business with the goal of knowing I won't have to one day.What are you finding in terms of how much money you'll have to put into diversified income/mutual funds to earn the monthly income needed to support your lifestyle? 

This is not a rule anymore, property value and rents have not seen the same appreciation and will never balance out even at 1% unless you are in C class neighborhoods.