Which is rather common in my experience. The town adjacent to the one I just moved to has a bunch of duplexes, but if you look at the current zoning it's all si

Which is rather common in my experience. The town adjacent to the one I just moved to has a bunch of duplexes, but if you look at the current zoning it's all single-family-only. You couldn't build much of the town as it is today, which is a shame as it's very nice. As you might expect given this, the town has steadily lost population.