A good starting point will be to pair with a with nationwide lender (if not all cash), check in with @Joseph Chiofalo for financing without a US credit score. 

my lenders.

The core 4 is David Greene’s long-distance investing strategy and consists of a realtor, contractor, property manager, and lender.

According to market comps from the area all together the homes' value total approximately $600k minus 80k left on that 4th property's mortgage. 

Lenders will allow up to 85% financing on investment transaction assuming credit is healthy and reserve requirements are met. 

I am currently reviewing the numbers associated with a wraparound mortgage and I need some assistance in determining if they make sense.Can anyone please direct me to the appropriate person who would be able to help me analyze and verify these figures?

Supposedly, these mortgages were actually bought by a company called "LSF8 Mortgage Holdings, LLC" but even that is in question at this point.  

What if no other insurer will provide a new policy, but my lender requires full ongoing coverage, and would treat a naked situation as a default, meaning immediate loan repayment or foreclosure?  

HI Julie,You can always start off by house hacking meaning you live in one UNIT or ROOM and renting out the other vacant units/rooms to offset your monthly mortgage payment.There are several ways to run and make sure you are maximizing your rental income while keeping your living expense as low as possible.

Depending on your credit history and reserve amount, some lenders may allow up to 85% financing on the purchase.