His crony Hatti Day is the “real estate manager” of the property and actively avoids addressing any of the lies she makes related to the unit.

I would bet the solution lies in your answers to those last three questions.

agree .. other wise its just the bottom feeders looking to take his equity from him  with couching it as a rescue.. his best bet it to sell if its owner occ the profit is tax free .. regroup and start over.. 

Personally I wouldn't feel comfortable trying to wholesale a relatives $1M home knowing that I am breaking the law if I cross over into doing anything that can be considered representing them in the transaction, and knowing it will only be marketed to people who buy properties wholesale (typically investors who don't want to pay retail prices), instead of the majority of retail buyers active in the market who are typcially willing to pay more. 

This doesn't necessarily mean just an investor, but somebody who active works in the space and puts in at least 700 hours of work into it per year. 

Networking with local real estate investor groups can also help identify lenders active in your area.

I would also pay by activity not by the hour.  

Are you still active? 

For bookkeeping purposes, I recommend designating a separate bank account exclusive to the house hack activities to keep some sanity.

If you have no desire to actively pursue other investments where you make more than a 2.8% return, then by all means pay it off faster.TYFYS and best of luck!