What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Choosing the right lender for a HELOC (Home Equity Line of Credit) can make a huge difference depending on your goals.

I'm originally from BR and am fairly active there. we see a lot of inventory so also happy to chat offline about this

It happens, a fair bit.

We purchased this as a BRRRR on a Line of Credit, went to do a few fixes then refinance.

@Robert Quiroz, I know this is fairly well covered at this point, but I align with Robert...  

Id go right into looking at local credit unions and small community banks for HELOCs (lines of credit) so you can have a lower blended rate and draw/payback as you please.For the 3F - Since this is free and clear, you would only be looking at 1st position options here in the world of financing.

House HackAttend as many REI meetups as you can to grow your network of investors for referrals, help through challenges you may incur but don't have experience with, and learn from proven guest speakersNetworking app like blinq to compile all of your contacts for REI in one area with phone and emailbegin conversations with local credit unions exploring what type of loan products they offer

We are contractors with different expertise and want to figure out a way that is fair both to get compensated.

I would look at it in terms of whether you can afford a worst case scenario where you're covering the deductible and have a credit line or cash to front the re-build cost and getting reimbursed from insurance afterwards.