In the ongoing controversy over height limits of various types, one phrase commonly bandied about is “vertical sprawl.” Some argue that tall infill development is itself “sprawl” – presumably because just as regular sprawl extends horizontally into the countryside, taller buildings extend vertically into the airspace.
But in fact, there is no similarity between taller buildings (even high-rises) and horizontal sprawl, because the major concerns about sprawl are unrelated to height, and vice versa. To examine why this is so, let’s ask ourselves: why should we care about traditional sprawl?
The most commonly voiced concerns, as far as I can see, fall into two categories:
*Environmental. Environmentalists worry that sprawl leads to more driving, and thus to more air pollution and climate change. By contrast, infill development (whether the development is two stories high or thirty) in transit-friendly areas actually reduces driving by increasing the number of people with access to public transit.
*Social equity and quality of life. Sprawl means that jobs and other social amenities move to places without public transit, thus making it impossible for persons without cars to reach jobs. Residential infill development (whether the development is two stories high or thirty) means that more people can live in areas with public transit, and commercial infill increases the number of people whose jobs are reachable by transit.
Admittedly, it could be argued that infill development leads to gentrification, which in turn leads to displacement of the poor. Even if this argument had some validity (a subject best addressed in a separate post) it is irrelevant to height. Even if it was true that infill development increased real estate prices to the extent that poor people were driven into car-dependent suburbia, this would be the case whether the development consisted of two-story walkups or twenty-story towers.
It seems to me that the most common concerns about high- and mid-rise infill have nothing to do with sprawl. Some people have aesthetic concerns about taller buildings- but even if both types of structures are both unattractive, a high-rise tower is not physically similar to a strip mall any more than a morally unattractive gossiping neighbor is similar to a morally unattractive dictator 4000 miles away.
NIMBY (Not In My Back Yard) attacks on infill development often center on traffic and parking. But these arguments are often a defense of existing sprawl rather than an honest attempt to compare horizontal sprawl and high-rises: if you really believe that compact development creates traffic congestion, you must therefore believe that sprawl eliminates congestion, and that sprawl is a good thing. And if you believe that land’s highest and best use is for cars rather than people, you should think that sprawl is perfectly fine. In any event these arguments are really attacks on infill and density generally, not attacks on high-rises specifically.