Is it best to approach an architect or a land developer for what I am proposing?

Summary: 7 loans outstanding: 4 in foreclosure, 1 in default - trying to develop a plan before I begin foreclosing, 1 current, but has needed multiple payoff extensions, 1 current with no issues.

It's one of the hottest markets in the US right now with so much population growth, job growth, and companies moving/developing here (26B Intel headquarters being built here, 68K+ enrollment in Ohio State University, Amazon, FB, Google, Honda, Nationwide, Anduril, etc.).

Just factor the cost into the rent.

We plan to share ownership of the property as I am going to invest my money into developing (building a Detached ADU in the back) and re-modeling the property so that we can collectively sell it for a profit.

Also, factor in potential interest rate changes if the HELOC isn’t fixed.

If you're considering house hacking a multi family property, some lenders might be able to factor in potential rental income to help you qualify.

Your accountant should be able to factor that into your total cost. 

I have a lengthy Legal Opinion, from my seasoned Legal Team regarding this matter.There are several important factors, when thinking about proposing Seller Financing.

Quality pics are by far the number one contributing factor.