Well there are countervailing trends here: on one hand, land being extra scarce because it is used inefficiently, and on the other, land being extra valuable be

Well there are countervailing trends here: on one hand, land being extra scarce because it is used inefficiently, and on the other, land being extra valuable because it is used efficiently. https://en.wikipedia.org/wiki/Jevons_paradox https://en.wikipedia.org/wiki/Jevons_paradox is probably the answer: Non-idiotic land use would make the cost of floor area decrease, but the cost of land increase.