Interesting about the other set of rules. Sounds like an exercise I did with a couple of friends back in the 80s at an ICOM AGM.

We called it co-opoly, to be played on an identical monopoly board. The main difference was that rather than one person holding property, there was the option of shared ownership - ie the rents collected were shared between all the owners, property development was subject to consensus agreement, and building costs were shared. The objective was to see if co-opoly could be a win-win game.