Image of the day: Vancouver vs. Paris

From citydensity.com, by Jonathan Nolan

Opponents of high-rise projects in Vancouver often hold up Paris as an example. This graph compares the density of Paris and Vancouver. From @westsidebackyd on Twitter:

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citydensity.com, by Jonathan Nolan, lets you easily compare population densities of cities around the world.

I like low- and mid-rise projects, because they’re faster to plan and to build, but high densities are appropriate where land values are particularly high. See How Skyscrapers Can Save the City, Edward Glaeser, Atlantic Monthly (March 2011). Glaeser pointed out that in New York City, there was a huge gap between the cost of adding an additional floor to a high-rise and what it would sell for; the reason for this gap is city restrictions on building.

Building up is more costly, especially when elevators start getting involved. And erecting a skyscraper in New York City involves additional costs (site preparation, legal fees, a fancy architect) that can push the price even higher. But many of these are fixed costs that don’t increase with the height of the building. In fact, once you’ve reached the seventh floor or so, building up has its own economic logic, since those fixed costs can be spread over more apartments. Just as the cost of a big factory can be covered by a sufficiently large production run, the cost of site preparation and a hotshot architect can be covered by building up.

The actual marginal cost of adding an extra square foot of living space at the top of a skyscraper in New York is typically less than $400. Prices do rise substantially in ultra-tall buildings—say, over 50 stories—but for ordinary skyscrapers, it doesn’t cost more than $500,000 to put up a nice 1,200-square-foot apartment. The land costs something, but in a 40-story building with one 1,200-square-foot unit per floor, each unit is using only 30 square feet of Manhattan—less than a thousandth of an acre. At those heights, the land costs become pretty small. If there were no restrictions on new construction, then prices would eventually come down to somewhere near construction costs, about $500,000 for a new apartment. That’s a lot more than the $210,000 that it costs to put up a 2,500-square-foot house in Houston—but a lot less than the $1 million or more that such an apartment often costs in Manhattan.

Land is also pretty limited in Chicago’s Gold Coast, on the shores of Lake Michigan. Demand may not be the same as in Manhattan, but it’s still pretty high. Yet you can buy a beautiful condominium with a lake view for roughly half the cost of a similar unit in Manhattan. Building in Chicago is cheaper than in New York—but it’s not twice as cheap. The big cost difference is that Chicago’s leadership has always encouraged new construction more than New York’s (at least before the Bloomberg administration). The forest of cranes along Lake Michigan keeps Chicago affordable.