The questions appears to be focused on the equity side of the equation, while Christopher response was focusing on the implementation side of things.The simple answer is, there is no way to get a cost estimate based upon what you asked. 

That person clearly is not doing there job or is missing from the equation. 

BTW, when you see life through numbers and equations (and colors.. for those with synesthesia) you can clearly see truth through the noise.

I've found I can make the numbers work with new construction but I had to get my GC license to remove that cost from the equation. 

Insufficient income (I assume her disability does not equate to 3X the rent) = not qualified for my units.let some other LL make that mistake.The one exception is if you want to be altruistic and help out a disabled single mom with a t 13 year old boy. 

Normal or not, here we are and money is basically free right now, which is half of the equation in most deals. 

In most states, that equates to a month-to-month lease and you are required to give her 30 days notice in writing.

Interest will continue to accrue on a smaller principal amount beyond the five years.If I go with paying down the mortgage option and do a cash out refi, I will have to pay closing costs, which also complicates the equation.

If you have a apartment that requires 20-40,000 btu/hr to stay heated, that equates to roughly 5-11kw of energy per hour. 1kw is only good for 3,410btus an hour.

I only ask because I have never heard it referred to as such and would equate financing a boat (I’m a boat guy, but never financed one) like financing a car, not necessarily a house.