I would consider asking a slightly higher interest rate than market, because you are offering financing for a buyer that may not qualify for a traditional loan.

If my spouse wasn’t opposed to moving I would try to buy a new house hack every 12-15 months and use low down payment owner occupied loans for as long as it made sense.

Since i had capital and had access to my commercial banks for the best rates possible on vertical and horizontal loans..

I ran my own custom proforma for a bank loan using the asking price that would generate a cap rate over 10% and CoC just under 20%.

If the other two parties want to flip a house maybe they can do just that as partners and then sell you the house which you can buy with a primary home loan with low down payment.

Bridge Loan: A bridge loan could provide the $150,000 you need until your tenant-free property sells.

I would include servicing costs of the loan and licensing costs.

I am bullish on the FHA 203k and home-style renovation loans that allow you to leverage the cost of your renovation as part of your mortgage, which is just an insane deal, in my opinion.Do you have a specific area where you want to purchase?

Contrary to most business lending, the REI industry has a lot of "non-bank" lenders that provide attractive loans that can lower your cost of capital and improve your profit/cash flow. 

If the loan was fully funded at closing and since then the loan is in an interest-only payment period, these numbers would equal.