Subject to economic / technical constraints. But when there's money at stake, construction companies find a way. The petronas towers have pylons driven deeper t

Subject to economic / technical constraints. But when there's money at stake, construction companies find a way. The petronas towers have pylons driven deeper than 100 meters [0]. You're right that the land matters and a San Fran to Dallas comparison is challenged in many dimensions but I think San Fran's housing market would be more reasonable if it were money / technology constrained, not zoning law constrained. [0]: https://en.wikipedia.org/wiki/Petronas_Towers https://en.wikipedia.org/wiki/Petronas_Towers