Thanks to the growing influence of the new urbanists — a group of architects and urban planning professionals who promote the development of mixed-land-use neighborhoods — “transect zoning” is becoming the zoning reforms du jour. Over the last few decades, the new urbanists have mounted a remarkably successful public relations campaign against traditional zoning practices and the suburban land-use patterns resulting from them. The new urbanists’ case against zoning is part anti-suburban polemic and part pro-urban philosophy. At heart, the new urbanists’ claim is that cities are good for us, and suburbs are bad. Or, to put the claim into social science terminology, the new urbanists claim that cities generate social capital while suburbs inhibit it. Thus, it follows that zoning laws that mandate a single-land-use, “suburban” built environment ought to be scrapped. These claims build, in important ways, upon Jane Jacobs’s enormously influential book, The Death and Life of Great American Cities. Jacobs wrote at the apex of the urban renewal period — a time when urban planning ideology and practices strongly favored the imposition of single-land-use patterns on our cities, even to the point of demolishing mixed-land-use communities in order to replace and modernize them. She vehemently rejected the accepted wisdom that dense, mixed-land-use urban neighborhoods were hopelessly antiquated and unhealthy. On the contrary, she argued that mixed-land-use neighborhoods are critical to city life because commercial land uses both generate social capital and guarantee a steady supply of “eyes upon the street” to monitor and keep disorder and crime in check.