Once all the dust has settled and the profit is counted up, is the profit still 20% of sale price?

Not my bag.  

And not to throw @Joshua Dorkin under the bus but I think it's mostly Josh over Brandon who bags on Detroit haha.

After looking for a duffle bag full of money stored in the attic and back yard I began to wonder what my liability was for unwilling allowing this to happen.

The grain would gravity flow down a chute into a feed cart to be taken over to the grinder or be bagged for cattle feed.  

Here is what we put in our move out letter, which may be helpful to build on:Specifically, here's a list of items you should thoroughly clean before vacating:[ ] Floors[ ] sweep/mop laminate floors[ ] vacuum carpets and rugs (shampoo if necessary)[ ] mop kitchen and bathroom floors[ ] Walls, baseboards, ceilings, and built-in shelves[ ] Kitchen cabinets, countertops and sink, stove and oven--inside and out [ ] Refrigerator--clean inside and out, empty it of food[ ] Bathtubs, showers, toilets, and plumbing fixtures[ ] Doors, windows, and window coveringsPlease don't leave anything behind--that includes bags of garbage, clothes, food, newspapers, furniture, appliances, dishes, plants, cleaning supplies, or other items that belong to you.For move in, put all info in the rental agreement.  

I keep hoping to find bags of $100 bills but alas, no luck so far. 

The dust has settled, the money is in the bank, the final analysis is in.  

By the time I had finished printing yellow letters, putting them in stacks of fifty, then rolling them up with rubber bands, I had enough rolls to fill a gym bag.

Another one bites the dust!