The buyer definitely owns the property, otherwise it is not owner financing, it is some sort of lease or option or a combination of the two.

They are inefficient because the system has to be tuned in so much, that within that 100 mil dataset, perhaps only 18 combinations make sense to become a product.  

If you bought 5 properties with $300,0000, they all need to be throwing off a total combine of 20% return to get that $5,000 (as the example above shows), to get that expense coverage for your ability to leave your job. 

It might be a combination of stocks, bonds, mutual funds and alternative assets.  

If I could do it all over again I would entertain more contractors but overall the project was a success.

There are some out there that teach how to best use a combination of marketing types.

If the other houses you own have no loans could you stack all their combined monthly rental income to pay off the remaining $120k mortgage before you retire? 

that short term loan - whether it's a HELOC or hard money or cash or a combination - has to be paid back regardless of what the end product appraises at. 

Notably, the leased properties are located outside the United States, and we manage them remotely.We have our downpayment saved and approximately $450,000 in combined equity from our existing properties.

I ended up using a combination of XL (each loan has it's own tab with loan details and amortization/payment table), Outlook Tasks/Reminders (to track upcoming due dates/maturity dates), and QuickBooks (for general ledger)...all held together with some bubble gum.