CE doesn't currently have an infinitely scalable passive investment - street narcos, productions and expeditions all have a hard limit of how much money can go into them.

Once property rentals are introduced, this will create an investment option that is, within the constraints of the playerbase, unlimited. Rich players will be able to massively multiply their net worth, making it nearly impossible for players joining later to catch up.

A cap on ownable property plots would prevent this issue and maintain the existing balance of the game.

Disagree with you on that, should not cap the amount of plots a player can own, they have been grinding to get to where they are and to gain the amount they have don't punish a player for owning the market