I use online apps (Wave is one good one) have a separate bank account and separate ledger account for each property...

The property taxes online said the owner was paying 3k a year.

Essentially, you'd be clear of the mortgage +10K upfront, and then you are seller financing the other 100K. 

I am a licensed mortgage broker for residential and commercial mortgage loans.

The refinance will get our down payment back, along with the current mortgage and renovation loan paid off.

But we could not personally afford the mortgage on this place without a renter.

Plenty of free contracts online that are great for all states but you may have to sign up for their newsletter etc.

My title co. recorded my deed, but did not release my funds to the seller's mortgage co.      

.), income, cashflow, debt, DTI, equity, property appreciation, rent appreciation, mortgage paydown & amortization, rate of net worth growth, cost of living increases, hours worked per week, cash on hand, etc, etc. 

This ADU would be used to rent to friends or family and generate income.I cannot seem to find the answer online myself.