@David Schulwitz - I can't tell from what you posted if you are using current rents for all units or have already subtracted the unit you plan to live in.

So you would subtract 215 from 625.

Rough estimate after subtracting hard costs is that you are walking away with $12k?

Then, subtract out the repairs.

;)What happens if we just stay with addition, subtraction, multiplication and division?

Subtract off 50%, then your P&I payment.

Then you would subtract your mortgage from the remaining $1000.

I usually take that amount and subtract 10 to 20% from it and negotiate the payment of the draw from there.

I never pay more than $100 earnest when contracting on a property from an individual.You need to have accurate comps to determine the ARV, then subtract 30% which means you will be selling at 70 cents on the dollar, subtract repairs from the 70% of the ARV, and that is what you need to sell the property at to your cash buyer.

Then subtract any specific expenses to the property.If this property was designed as a double, and there are separate water meters, that will help.You can do better on the mortgage rate.