But if they want the flexibility I think it's a fair arrangement.  

You have a governmental authority using its power to hinder and regulate private transactions creating some kind of “litmus” test based on god knows whatYou have a seller remaining in a home he sold indefinitely.You have a lender that has twice filed for foreclosure You have a profit sharing arrangement upon resale with the seller/tenantYou’re performing repairs/maintenance on a house while occupied by the seller/tenantAny or all these are lawsuit magnets.If you buy a property, and the seller is a consumer, not an investor, you should NEVER do a profit participation.  

I think you may want to start of the arrangement in a more simple fashion.Ask for a loan in which he will get a stated return 6% to 12%.If you are both successful happy with this arrangement, upgrade to a partnership.I think a partnership off the bat makes things complicated.You will also likely make more money in a loan agreement if the project does well.

. $400 for a 2-day rental of an 11-yard dumpster might seem high, but it’s important to consider what’s included (delivery, pickup, disposal fees) and whether there are any weight limits.Alternative Options:Bagster Bags: These are large, disposable bags that you fill with debris and arrange for pickup.Junk Removal Services: Some companies specialize in hauling away specific types of debris.

Also, I can adjust my calendar and pricing, arrange cleaning, teams and task.

One thing to keep in mind is "less is more" when it comes to telling anyone including the Loan officer what you plan to do in terms of living arrangements.

However, keep in mind, the renter will need to share a bathroom with the current tenant, and I've spoken with her about this, and she's fine with this arrangement. 

Consider equity shares, profit-sharing arrangements, or other creative financing structures.Legal and Financial Structuring: Work with legal and financial professionals to finalize agreements and ensure compliance with regulatory requirements.If you have any other questions, just want to discuss, or need a loan officer please feel free to reach out to me directly!

Maybe there is some other arrangement for it such as watering underneath the lawn or something.

Thank you @Nathan Gesner   The tenant doesn't want to move out because he can't find equivalent living arrangements at this price.