I'd also reach out to your prior walk throughs that were interested and let them know the other tenant couldn't move in so you wanted to give them first shot at the place before relisting it. 

I imagine that requires skill and experience.

I’d let them go but provide them with help to move.

Engineering makes ok money but I’d like to make an additional 40-50k a year at least using real estate.

The last thing I'd want is to be unable to refinance into a traditional mortgage, then i'd be stuck with a rather massive bill to pay at month 12 that'd i'd be unable to actually pay haha.

I'd be interested in seeing what land notes your partner has available.

I'd like to offer her a financial incentive now. 

If you are going to go this route, I'd recommend incorporating phone calls and/or doorknocking.

I'd do some research on airbnb's in the area and see what their occupancy rates are to see if your return on investment will be worth it.

This is where I'd spend my time for the next several months.