for me, the ones that cashflow the most are the ones that I bought with 3% long term debt, they were new (low maintenance) and they are in high appreciating areas(just a bonus but does not impact cashflow).

For a 3-4 family home, it's more complicated—you're looking at commercial lending, which requires a large upfront investment, high holding costs, and greater risks.

The interior was made up of high efficiency HVAC systems, contemporary lighting, and electric water heaters.

Since you’re considering Midwest markets, I’d highly recommend adding Detroit to your list of cities to research.

In San Diego at the current rates for a purchase loan (which has better rates than an ADU additions) at high LTV, I show 1% does not cash flow on a sustained basis.  

They all came to the same conclusion: rent control keeps prices high.

You can even make collateral withdrawals as you pay down your principal.But these are usually high interest, interest-only loans.

If you are looking to expand your knowledge I highly recommend the webinars BP offers. 

But on this specific guy, I jumped on a call to explore the program and it was a high pressure sales call, it did not feel organic, not trustworthy and certainly did not feel the right fit.Why would someone spend 10k on a so niched-down space of real estate when they can get someone for the same amount to teach him/her everything?  

They're highly recommended and we'll regarded here.