The interest on the remaining $30,000 would be assessed as the borrower uses holdback funds from the rehab budget.

What other funds can you leverage outside of the vested stocks?

If they want to develop the property they can just hire a builder no need to partner.YUP and like I said when you take in very low basis and then turn it into inventory most of the time a sale is the far better thing to dounless they are going to build and hold. 

I’ve pondered buying a cheaper 100k rental cash to essentially fund a personal home mortgage if I could find one.

As a lot of others have said already, your guess is way low.

We have low inventory and steady demand.

Investing in a REIT is normally pretty straightforward -- although some "REIT" investments are really mutual funds or ETFs that themselves own some REIT shares or track REITs.   

My low-tech way for doing this has been to get a legal pad and write a different subject across the top of each page: Tenant Screening, Financing, Landlord Tips, Finding Housing, etc.  

You definitely should ensure you select a contractor that is knowledgeable and has reserves to fund the project upfront and be willing to reimbursed.

HML & gap funds What was the outcome?