What do you think the best way to finance the project?

I think you need to know who your investors are.

The bank has no say in it.None of these facts add up and I think there's more to this story.Either way, banks don't buy houses so don't waste your time there.

Always think it is extremely important to note that Cap Rate does not drive value on Single Family Rentals since NOI is not the factor for the vast majority of the market - only really relevant for Multifamily and Commercial (BP audience is generally skewed towards residential not commercial investing)

I’ve read about the house hack but don’t think that’s in the plan since we just built our current residence. 

I don't think that makes sense unless rates are really low. 

I just started to look at HELOC's, and don't think it'll be worth it to refinance because my low interest rate.

@Richie Linnon, a few things to think about:1.

I think you may be over estimating the time required to obtain permits.

I was in the Air Force for 8 years, so i believe i understand their thinking and i know how their finance SHOULD work.