A couple of ideas:

• Home Ownership. I know condos exist, but it seems to me that we need a solution for home ownership that is accessible and ecologically viable. Traditional houses (and even duplex's/townhomes) are massively inefficient from a climate perspective, not to mention the space requirements and cost.

• Child rearing. In college, I learned that children were typically raised by multiple neighbors, in order to lessen the strain on parents. I think it is unrealistic and unhealthy to expect people to nearly kill themselves attempting to raise a child for the first couple of years.

• Recreation space. I realize this is mostly an American thing, but lawns are a colossal waste of space. To be of any use at all, they have to be at least half an acre, and realistically, there's no reason every single family needs their own outdoor recreation space. Plus, a tiny minority of people even use them these days.

Private property, specifically your toothbrush, comrade.

There’s always someone who doesn’t know so I’m contractually obligated to say that by property we mean the means of production and not any other personal belongings.

Masturbation.

Cooking. Let's all just cook one big meal each week and split it among 6 other people, and receive 6 meals in return.

Transportation and gardening.

Cooking because it's a pain in the ass to prepare food in small batches (for 1-3 people). Plus clean up It's basically as much work to make food for 2 people as it is for 8.