there are a ton of build code issues in the US that raise the cost of construction without substantionally improving benefits. As an example, I am in Europe right now, most apartment buildings here have single stair entry and smaller elevators, both of which are prevented by US building regs for bad reasons. Fixing these regs would expand the market for new construction at the low end (lower costs for marginal opportunities) and the high end (makes 4 unit condos feasable).