You can explain how it can be like supplemental retirement income that he'd get by the month. 

I would recommend getting clear on a few things: where you want to invest, what type of property you want to invest in, and, perhaps most importantly, exactly what your goals are.If your goal is to retire in 5 years from passive income then your path will look very different from having a few rentals to supplement your income. 

Unlike Fannie/Freddie programs, HUD also doesn't have any easy supplemental loan process to do an equity take-out, so if you're trying to realize the appreciated value of an asset soon after the initial HUD closing, there's no way to do that.In my experience HUD 223(f) is best for the legacy holds (as mentioned above), estate planning, "crown jewels", etc where you have a pretty good idea that you're not going to sell for at least 10 years or later.For shorter term investment strategies, I wouldn't recommend it. 

CA supplements food stamps /EBT so the residents get more than in the rest of the US. 

I know the ultimate package of the BRRRR book comes with a supplemental long distance e-book specific to the BRRRR strategy, so would it be redundant to also read the full book on long distance investing?

I am looking out of state for a better monthly ROI to help supplement my own mortgage/passive income. 

Thereafter I’m trying to consider other ways to create sustainable cash flow/income that can supplement the cash flow fluctuations of short-term rentals.

So to confirm my understanding then, the Supplemental Tax bill is basically just the difference between the assessed value of the prior owner and my new assessed value (ie my purchase price) * the tax rate I looked up on the auditor's website * a pro-rating based on when I bought the property during the year, right?

I’m not going to get rich off that, but it’ll help supplement my 401k retirement income.

If that's the only cash for your BRRRR you would likely need hard money to supplement the down payment, the closing costs, and the rehab.