It can be used as a 4/2 with a private attached studio, or as 4 room rentals with a separate studio (which is what we currently do) or as a 5/3 SFH. 

I go to a meet up in San diego called private lending masters.  

Looking for solutions to offer financing to buyers:We have a unique asset class that we're building out here.  The land is unbuildable for residences and we build these storage workshops on the properties.  Each lot i...

Learning about fix-and-flips and leveraging private or hard money lenders can help finance flips.

Agree with @Ian Ippolito 100% based on my experience in fund formation and product development in private alternatives. 

Did you use a local bank/credit union or a private lender?

Not sure what the layout looks like or location - but in a solid location, which I'm assuming since it's an STR, you should be able to in the ball north of $800-1000 per room and even more so for the rooms with private baths.

I currently haver a private mortgage on the property that I will need to refinance in about a year or I have to pay a baloon payment. 

This can be hard money lender, private lender or bank.  

My STR is in a city where it is legal in private but not in public.