For example, say the investor is requesting funds for a rehab draw and they utilized a GAP loan. 

Yes, nonrecourse loans can be paid down on an accelerated schedule.

You might try and look locally for portfolio loan or DSCR loan.

I'm currently a buy and hold investor (utilizing various househacks), but I'm hoping to get into the STR space end of this year/early next year.In terms of your financing options, here are some things that come to mind (albeit may or may not apply to your situation):- Utilize second-home loan option (10% downpayment) if the property qualifies- Utilize a small local bank to see what loan options they may offer (perhaps some may have experience lending on STR?

One way you could leverage a Solo 401k is by taking a personal loan from it.

If you have a mortgage on those properties, you will likely need to refinance these to avoid triggering a "due on sale clause" when you move these into an LLC with conventional loans.

Any information/advice is appreciated and also how to properly set up our company, how to eventually scale our portfolio and looking to learn more about funding and DSCR loan.

I don't see much change occurring, but hey, I could be wrong.The value of agency, as a whole, varies with market conditions in individual markets; varies with the condition, pricing and demand of an individual property; differs with the relative financial strength of the buyer.  

In the worst case, I've seen contracts where LPs are made to personally guarantee the loan.

There are HELOANs which are second position loans that you can use, typically 30 year fixed.