If that's what you're really after I would start with the basics of what kind of bank loans either residential or commercial are available to you - not saying this is the best option, but it's a good place to start.

Sounds like you are getting hit with a lender who has overlays and possibly miscommunication between the loan officer/processor to the underwriter.

When I asked for a loan, they asked if my business received money in Euros. 

I have also been doing quite a bit of research on Loan's, tax consequences etc., and am working towards being a expert in this niche.  

I would consider asking a slightly higher interest rate than market, because you are offering financing for a buyer that may not qualify for a traditional loan.

We process, underwrite, close and fund the loan.  

One thing I continue to think about is how valuable 2-4 unit properties are becoming, and will continue to be, since Fannie/Freddie took the income restrictions from the 5% down conventional loan option for house hackers. 

The bank set me in at 7.1% interest (construction loan short term) This will be a side hustle for me.

The cause of the 2008-2010 Great Recession was bad real estate loans - if you could fog  a mirror, you could get a mortgage!

Further context, I have zero debt, high 700s credit score, one other investment property here locally. 175k in cash available, looking to do DSCR loans or cash and then refinance.Peoria, Illinois- Great need for lower income housing, market appears to have many options.Lawton, Oklahoma- Looking only at extremely cheap properties, as it seems it’s not terribly hard to find renters.