There are services like Blockfi, Unchained Capital, and many others will will give you a short-term loan backed by your crypto assets.

A non-recourse loan is an option if your SDIRA doesn't have enough funds.

His "buyers" - who could not qualify for a loan because, presumably, they could not convince the bank they made enough to cover PITI payments - inevitably defaulted, and after a few months he would evict and start all over. 

Just because you get a loan approval does not always mean you should move forward with it.

@Nick AmDepreciation is a ZERO % interest loan.  

I recently came across 1 acre asking for 314k in a very good residential and growing location, so the current owner has added 4 manufactured homes with 4 electrical meters, 4 septic tanks and only 1 water meter for all 4 homes, the homes are sitting on partial slab and partial pier & beam, he also added 2 storage sheds approx. 380sqft with the intention to make them ADUs they are still only the shell so I would have to get those ready to live in, so currently the 4 manufactured homes are being rented and bringing in 2800k a month, 3 of the homes are needing some TLC which could increment rents and possibly get me at 3600k a month, also being a 1ac lot this still leaves about 12,000sqft of raw land where you could build etc.So that is on the good side now the things I did not like so much, the lay out is poorly executed to where it makes it looked crammed up and not professional but it could be fixed.Another is that in reality there is only 4 livable units so that qualifies under a conventional loan but since they're are 6 units on the property the banks are wanting to take it as a commercial so we would have to move out the 2 storage sheds out in order to close as conventional.Another concern, technically you are only allowed to have one manufactured house or single wide in your property according to what I know but I know it could change according to zoning which I will investigate, so my question is has all this been accounted for and if so how can I verify it so it wont leave me in a bind further down the road, I currently asked my agent for the appraisal of the property to see if that might verify.Any recommendations?

Contrary to most business lending, the REI industry has a lot of "non-bank" lenders that provide attractive loans that can lower your cost of capital and improve your profit/cash flow. 

I’ve been working with several lenders for DSCR loans, but I’ve found that the fees are quite high, with minimal benefit in terms of lowering my current interest rate.

If you can find someone to loan you money for this endeavor please share their information with us all.

On the other hand, if you're aiming for long-term rental properties, getting prequalified with a lender specializing in traditional loans or DSCR (Debt Service Coverage Ratio) loans is key.