You divide total days rented over total number of bookings.

What we would do is figure out the amount between actual and market rent, divide it in half, and raise rent to that.  

I do count hours spent at job sites, hours spent here on BP, hours spent getting and contracting deals and selling deals.I too also have other ventures going and a family so my time each week is divided between all of that.I am a control freak, or better explained "want a job done right, do it yourself" so I have yet to hire that assistant to date, but plan on it very soon.

As long as you divide it into classes.  

Shaker cabinets with quartz counter tops. lot completely divided by fence.

We all contribute to a pot of advertising and leads are divided out throughout the month based on the amount af advertising your spending.

You would essentially abolish student loans and would need to pay for college with cash which would then continue the divide of the upper and middle class because only wealthy kids could get educated.

There are some cool old homes closer to downtown that have been divided into multis that may suit what you are looking for.  

I bought 5 acres for 10k in Clay County FL I had them resurveyed and divided into 5-1 acre lots and sold them all for$7500-8k each.1989-90  I then purchased a commercial acre for 17 k and held it a few years and then sold it for 55k owner financed. 

We had someone build a divider wall and then we locked one of the doors.