They do have incentives, though. Maintenance costs are higher on larger houses and tend to increase with the age of a structure. You have to clean out all those

They do have incentives, though. Maintenance costs are higher on larger houses and tend to increase with the age of a structure. You have to clean out all those extra bedrooms that are never used or end up with a bunch of cobwebs everywhere. That second story becomes much less practical when your knees start to go. If you want more housing, the solution is just... build more housing.