As housing prices and rents soar out of control in tightly regulated cities like San Francisco and New York, many people have called for a significant loosening of zoning rules to permit greater densification. Many policies contribute to unaffordable housing, including rent control, historic districts, eminent domain abuse, and building codes, but zoning puts an absolute cap on dwelling units per acre thus is generally part of any solution to the supply problem. What’s more, as recent commentators have started to notice, even many of America’s most dense cities are predominantly zoned for single family homes, calling into question the need to dedicate so much space to a single housing typology.

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