Another great option is the BRRRR method (Buy, Rehab, Rent, Refinance, Repeat), where you buy a fixer-upper, renovate it, rent it out, and refinance to pull your cash back for the next deal, and this is a good route because most private lenders can go higher LTV than on a rental loan! 

Aim for 720+ for best rates, I suggest start building relationships with your local lenders.

You and your legal, tax and financial advisors should review this transaction in greater detail, especially the PLRs, to ensure you understand the significant risks involved and are structuring the transaction as close as possible to the PLRs to mitigate some of the risks.

Better Business Bureau reviews, etc.).Can I set up a self-directed Solo 401k if I have full-time job?

Having a solid team around you like agent, lender, contractors etc.

You also will need to have multiple lender relationships as you grow. 

Does anyone represent a wholesale lender or is a broker that knows of a lender who finances commercial (multifamily) properties that operate as AIRBNBs?

You should ask to speak to the commercial lender at the bank that carries your property's current mortgage.

The lawyer says he is pretty confident but since he has not read the entire lease, he says he can review it at additional cost if needed.

I've used the search feature on this forum but didn't have much luck.Are there any US investors, hard money lenders, or groups that invest in flips outside of the United States, specifically in Europe (Netherlands, Spain, etc.)?