Edit: messed up the formatting.
Does it matter to a family that can only rent if they rent from a corporation vs individual?
Spreading out renters is not a solution.
The following math works if the all landlords own the maximum allowed.
If the maximum rentals one could own is 1000, only 1‰ of the population can be landlords.
If the maximum rentals one could own is 100, only 1% of the population can be landlords.
If the maximum rentals one could own is 10, only 10% of the population can be landlords.
If the maximum rentals one could own is 1, only 50% of the population can be landlords.
To go back to the beginning, if there is no maximum, only 1 person (0.0001%) of the population can be a landlord and everyone else is a renter (the whole "you will own nothing and be happy" line).
What percent of the population do you want to permit to be landlords? Mind you, not property managers, specifically landlords.
Remember 100% of the population can be a property manager because everyone can manage their own property. But the largest percentage of the population that can be landlords is 50%.
I see that you differentiate from people who happen to have extra space and want to rent it out, that I can understand. But also understand that someone can buy 1 home specifically to fuck over other people.
The problem is that some people want to own other people's homes. Some people want to own 1000 people's homes and others just 1 is enough. In either case it is not the number that is the problem but the desire to own other people's homes for the sole purpose of rent seeking that is the problem.
That is what is meant by the comment about "merely own one family of serfs" is about.