Growth only happens upwards or outwards. Your post seems to suggest that Chicago still has both available, which is (pleasantly) surprising to me as I was under

Growth only happens upwards or outwards. Your post seems to suggest that Chicago still has both available, which is (pleasantly) surprising to me as I was under the impression that every major american city had hit the limit on outward growth (usually because the roads are clogged by traffic and there's no political will to build more trains, so nobody wants more farmland developed).