I completely agree with @Ashish Acharya's points about the cost-effectiveness of a HELOC and the potential credit implications if it’s secured by your primary residence.

It takes a lot of energy to thoroughly vet a deal and a borrower to make sure financing is secure.

Do you have any suggestions on how we can secure long-term financing under these circumstances?

I had two lines of credit one unsecured for 5 million ( check book) and another for 10 million that we would secure them up with .. but you need time to do that bank required appraisal etc before we could tag the secured line and even at that they only lent 72% in these commercial loan structures..

Being a subject matter expert, not because you are forcing it, but because you simply ARE, shows through, and investors are rightfully attracted to that. 

Do you currently work with an expert CPA who is helping you maximize tax breaks with your real estate investments?

Maybe if you had a good, secure location to store things you could pre-order stuff you think you might need for your next project(s) and stockpile it.

Work with a tax expert and real estate attorney to finalize the deal and navigate zoning or financing complexities.This post does not create a CPA-Client relationship.

You may want to work with an experienced contractor and/or other experts who have done this in the past.Disclaimer: While I’m a licensed attorney, I’m not your attorney.

Quote from @Jordan Kaylor: I'm new to real estate investing and have secured a HELOC on my existing home.