In NYC, they build up. Obviously, that’s problematic, which is why people are moving. It’s valid to think that planned suburban neighborhoods should stay suburban, but I understand if you disagree. The main issue is that infrastructure- not just housing, but roads, parking lots, sidewalks, etc- is just not capable of keeping up. There is some serious sakanas nefashos, besides for the monstrosities. (They are also often not safe- the one built next door to where my grandparents’ house used to be has a huge courtyard, below street level, with no railing. At least one car has gone off the road and through someone’s window because of that. People are taking advantage of the housing boom and being slapdash, which can produce awful results.)
