Or, in Providence, RI they took the oldest indoor "mall" (Arcade) and converted the second and third floors to apartments.  

I plan to own 15-20 eventually and maybe more if I can find the success I'm expecting.

For sure, it is a long process, and it you are converting a basement or something, mot likely to fail.I'm starting to go through the process now.

I have a PO Box that i used for that purpose and any other business mail but since converting to ACH i am not sure when its the last time I went by the post office.  

Actually you'd never hit that because eventually the debt pushes you into a margin call and forced sell and you'd be at or near $0 in just handful of years at best. 

You can convert the library and the famil room into bedrooms, giving you 7bed/5bath.Mortgage could be around $3,000 per month.

Eventually, after finally admitting he could not obtain a loan, he failed to return my capital, and completely stopped responding just long enough until the banks were unable to reverse any payments.

Just pay for the coaching, it will pay for itself eventually, you will get all the support you need to be successful and join a lively community of like-minded individuals all trying to help each other succeed.

query=garage#sear...If you can rent a 2 garage at $450 without spending ~$150k for a garage ADU conversion, no work/risk of the ADU conversion, the lower maintenance/capex, easier eviction, no rent control, less tenant interaction, it will not convert your SFR to rent control, etc, it seems superior to the garage ADU conversion.  

Since you are already familiar with house hacking, I would consider converting your current home into a rent-by-room or whatever it takes to keep it as a long-term rental, then look for another home you can hack.