Alex, as we are currently in a shift, you have shown up at the right time.  

The time thing is mostly just my hours, I work 3rd shift 10 PM to 6 AM and have weekends off so my hours awake are very odd and depend on the day as I do tend to work overtime a lot. 

Recommend you just Google "commercial lease" and copy & paste to get what you want covered.If you want commercial tenant to be responsible for the building, that's known as a Triple Net Lease (also shifts taxes & insurance liability).Then you should have a real estate attorney go over and approve your copy & paste creation.

Will your partner be upset because you are getting the better end of the deal living rent free(assuming you aren't paying rent).What if only your name is on the mortgage and deed, then the tax documents will all fall on you and your tax return and not his which makes it more complicated trying to shift income to him.If there are two people on the mortgage, it will impact both your DTI ratio's equally in full hurting both of your abilities to get credit in the future until the property is sold.Why can't you do the live in flip on your own?

The market has shifted dramatically since this post and prices are (hopefully) at a peak, but demand is still very strong.

Since the market shifted a few years ago we have stopped buying and have put the portfolio on autopilot. 

You're going to have to figure this out legally, I would get a lawyer and try to find your way out of this via payment plan like Jay mentioned, or if they messed up shift the onus on them. 

I'm aware that as we learn more our plans - which are more ideas than plans - will shift to align with reality.

This approach allowed us to move quickly and efficiently, ensuring a seamless transaction.

This approach allowed us to move quickly and efficiently, ensuring a seamless transaction.