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The urban economics of sprawl

Should YIMBYs support or oppose greenfield growth? Two basic values animate most YIMBYs: housing affordability and urbanism. Sprawl puts those values into tension. Let’s take as a given that sprawl is “bad” urbanism, mediocre at best. Realistically, it’s rarely going to be transit-oriented, highly walkable, or architecturally profound. So the question is whether outward, greenfield growth is necessary to achieve affordability. And the answer from urban economics is yes. You can’t get far in making a city affordable without letting it grow outward. Model 1: All hands on deck Let’s start with a nonspatial model where people demand housing space and it’s provided by both existing and new housing. Existing housing doesn’t easily disappear, so the supply curve is kinked. A citywide supply curve is the sum of a million little property-level supply curves. We can split it into two groups: infill and greenfield, which we add horizontally. If demand rises to the new purple line, you can see that the equilibrium point where both infill & greenfield are active is at a lower price & higher quantity than the infill-only line. The only way to get some infill growth to replace some greenfield growth, in this model, is to raise the overall price level. And even then, the replacement is less than 1-for-1. Of course, this is just a core YIMBY idea reversed! In most U.S. cities, greenfield growth has been allowed and infill growth sharply constrained, so that prices are higher, total growth is lower, and greenfield growth is higher than if infill were also allowed. At the most basic level, greenfield growth is simply one of the ways to meet demand. With fewer pumps working, you’ll drain less of the flood. Model 2: Paying for what you demolish Now let’s look at a spatial model where people […]

Houston as an Affordability Model

In December, I was asked to testify at a House Subcommittee on Housing and Insurance hearing on government barriers to housing construction and affordability. I provided examples of reforms to land regulations that have facilitated increased housing supply, particularly relatively low-cost types of housing, including multifamily, small-lot single-family, and accessory dwelling units. Following the hearing, I received a good question from Congresswoman Sylvia Garcia. She points out that, as in the country as a whole, the share of cost burdened renters has increased in recent years in Houston, in spite of land use liberalization. She asked what local policymakers could do to improve affordability for low-income residents. When market-oriented housing researchers point to Houston’s relatively light-touch land use regulations as a model for other U.S. localities to learn from, its declining affordability may cause skepticism. Houston, however, has fared better than many other cities in housing affordability for both renters and homebuyers. While Houston is the only major U.S. city without use zoning, it does have land use regulations that appear in zoning ordinances elsewhere, including minimum lot size, setback, and parking requirements. These rules drive up the minimum cost of building housing in Houston. However, Houston has been a nationwide leader in reforming these exclusionary rules over the past 25 years. Houston policymakers have enacted rule changes to enable small-lot development and, in parts of the city, they have eliminated parking requirements. In part as a result, Houston’s affordability is impressive compared to peer regions. As the chart below shows, Houston has the lowest share of cost-burdened renter households among comparable Sun Belt markets for households earning 81% to 100% of the area median income. Only San Antonio and Austin have lower rates of rent burden among households earning 51% to 80% of the area median income. At the […]

Pedestrianized streets usually fail – and that’s OK

Urbanists love to celebrate, and replicate great urban spaces – and sometimes can’t understand why governments don’t: But what’s important to recall – especially for those of us under, uh, 41 – is that pedestrianized streets aren’t a new concept coming into style, they’re an old one that’s been in a three-decade decline. Samantha Matuke, Stephan Schmidt, and Wenzheng Li tracked the rise and decline of the pedestrian mall up to the onset of the pandemic. Even in the urbanizing 2000s and 2010s, 14 pedestrian malls were “demalled” against 4 streets that were pedestrianized: In a 1977 handbook promoting pedestrianization, Roberto Brambilla and Gianni Longo admit that some of the earliest “successes” had already failed: In Pomona, California, the first year [1962] the mall received nationwide press coverage as a successful model of urban revitalization; there was a 40 percent increase in sales. But the mall was slowly abandoned by its patrons, and now, after fifteen years of operation, it is almost totally deserted. A Handbook for Pedestrian Action, Roberto Brambilla and Gianni Longo, p. 25 One obvious reason for the failure of many other pedestrianized streets is that they were too little, too late. The pedestrian mall was one of several strategies against the overwhelming ebb tide of retail from downtowns in the postwar era. They weren’t seen as alternatives to driving, but destinations for drivers, who could park in the new, convenient downtown lots that replaced dangerous, defunct factories. A minority of the postwar-era malls survived. The predictors of survival are sort of obvious in hindsight: tourism, sunny weather, and lots of college students, among other things. Some of the streets which were “malled” and “demalled” have rebounded nicely in the 2000s. The slideshow below shows Sioux Falls’ Phillips Avenue in 1905, 1934, c. 1975, and 2015. The […]

Will congestion pricing hurt cities?

In a series of recent posts, Tyler Cowen has taken the view that congestion prices in major downtowns are a bad idea. This is what one might expect of a typical New Jerseyan, but not a typical economist. The writing in these posts is a bit squirrelly (or is it Straussian?), but as best I can make out, Tyler is deviating from the mainline economic views of externalities and prices by arguing a few points: Urban serendipity and growth are high-value externalities quite distinct from the usual efficiencies of combining large amounts of capital and labor in downtown office towers. Occasional visitors to the city find very high value there (presumably via a long-right-tail distribution) including by creating demand for new goods Congestion pricing will (a) decrease the number of people in the city, (b) particularly high-value visitors. He also makes some specific critiques of the mechanism design of the proposed NYC congestion charge. It’s worth getting that right, but let’s leave the technicalities aside here. Tyler’s points – as I’ve summarized (or mangled) them – seem like a mix of reasonable and wrong, although in several cases difficult if not impossible falsify. I’ll tackle these points in a completely irresponsible order. 2. Distinguished visitors On the second point: Diminishing marginal returns is enough to give Tyler’s argument the benefit of the doubt. The first visit to a symphony or subway likely has a bigger inspirational impact than the seventh or seven-hundredth. And outsiders may bring insights to the city in an Eli-Whitney-and-the-cotton-gin way. But for consuming new goods? Perhaps visitors’ demand is enough to sustain new imitations of low-end consumer goods (like a McDonalds in Chennai, if there is one). But for narratives of urban creativity, I prefer Malcolm Gladwell’s account of Airwalk shoes or Peter Thiel’s identification of […]

New Report on Massachusetts’s Building Code Confirms: It’s Harder to Build Energy-Efficient Housing When You Don’t Let People Build Anything

The state of Massachusetts lets municipal governments choose how strictly they regulate energy efficiency in buildings. Fifty-two of the state’s municipalities use the base building code, whereas 299, including Boston, have opted into the stricter “stretch” energy code. In addition to these two, the state recently rolled out an even stricter “specialized” stretch code in the interest of getting to net-zero carbon emissions faster. Cities could opt in to the specialized code as of last December; several municipalities have already opted in, and Boston may do so soon. The new code is technically the Municipal Opt-In Specialized Stretch Energy Code, and I considered referring to it hereinafter as MOISSEC, which is cute because it sounds like a wine, but I ended up deciding that the least confusing option is to follow official documents in referring to the new option as the specialized code, and refer to what is existing law in most of the state as the stretch code. Given that Massachusetts has some of the most expensive housing in the country, it’s reasonable to worry about the impact of any housing regulations on affordability, even when they serve an important objective. Massachusetts had the third highest cost of new housing of all states in 2021, and has unusually low housing supply, even among expensive coastal states. Research from the Boston Foundation details the extent of the problem: Greater Boston has lower vacancy rates than even Los Angeles or New York, homes spend less time on the market in Boston, and Boston is not on track to meet its housing production goals, though construction has increased somewhat in recent years. A new report released Tuesday by the MIT Center for Real Estate, the Home Builders and Remodelers Association of Massachusetts (HBRAMA), and Wentworth Institute of Technology (WIT) projects the impact […]

Rhode Island’s housing process package

“Renting in Providence puts city councilors in precarious situations.” That was the Providence Journal’s leading headline a few days ago, as the legislature waited for Governor Daniel McKee to sign a pile of housing-related bills (Update: He signed them all). Rhode Island doesn’t have a superstar city to garner headlines, but it’s housing costs have mounted as growth has crawled to a standstill. But unlike in Montana and Washington, Rhode Island’s were largely procedural, aiming to lubricate the the gears of its existing institutions rather than directly preempting local regulations. House Speaker Joseph Shekarchi (D-Warwick), who championed the reforms, clearly drew on his professional expertise as a zoning attorney to identify areas for procedural streamlining. Specific and objective Six bills transmitted to the governor cover the general rules affecting most Rhode Island zoning procedures: S 1032 makes it easier to acquire discretionary development permission.  Municipalities cannot enforce regulations that make it near-impossible to build on legacy lots that do not meet current regulatory standards. Municipalities can more quickly issue variances and modifications. (Rhode Island draws a unique distinction between minor and substantial variances, labeling the former “modifications” and subjecting them to a simpler process. A substantial variance must go before a board for approval; a modification can be approved administratively unless a neighbor objects. Municipalities must issue “specific and objective” criteria for “special use permits”, otherwise those use are automatically allowed as of right. That phrase – specific and objective – shows up again and again in Speaker Shekarchi’s bills. S 1033 requires that zoning be updated to match a municipality’s own Comprehensive Plan within 18 months of a new plan’s adoption. It also requires an annually updated “strategic plan” for each municipality, although the content and legal force of the strategic plans are unclear to me. S 1034 broadly […]

Cataloguing California’s Cornucopia of Land Use Legislation

The Terner Center for Housing Innovation at the University of California, Berkeley has released a policy brief summarizing the effect on housing production of the bewildering array of new housing laws California has enacted since 2016.  A preliminary analysis of market effects of the new laws, accompanied by findings from interviews with California-based planners and land use lawyers, points toward the effectiveness of simple and direct legislation requiring localities to give ministerial approval to small-scale projects. For other laws, including those prescribing more complex formulas regarding affordability criteria for larger developments, it remains too early to gauge how housing production will respond. Of the legislation that has been enacted to date, California’s accessory dwelling unit laws (beginning with SB 1069 in 2016), according to those interviewed by the Terner Center, have been responsible for the astonishing twenty-fold increase in ADU permits documented from 2016 to 2021.  Legislation enacted in 2021 requiring ministerial approval for duplexes and lot splits (SB 9), estimated by the Center to allow for up to 700,000 new units, has not yet been widely used, partly due to localities’ use of other restrictive zoning regulations such as mandatory setbacks to impede use of the law.  Further strengthening of this law, in the same manner that the ADU law was fortified through 2019 revisions, may be necessary to unlock its full potential for new home construction.  Other new laws are in the early stages of demonstrating their effectiveness. The imposition of stricter requirements on localities’ Regional Housing Needs Allocation (RHNA) process through legislation enacted in 2017 and 2018 has resulted in dramatic increases in zoning capacity targets for the next eight-year period set by the Housing Element Law (of which the RHNA is a part).  For Southern California and the Bay Area, total housing allocation has increased from […]

Should governments nudge land assembly?

For a reading group, I recently read two papers about the costs and (in)efficiencies around land assembly. One advocated nudging small landowners into land assembly; the other is an implicit caution against doing so. Graduated Density Zoning Although he’s mostly known for parking research and policy, Donald Shoup responded to the ugliness of eminent domain in Kelo v. City of New London, with a 2008 paper suggesting “graduated density zoning” as a milder alternative. Graduated density zoning would allow greater densities or higher height limits for larger parcels – so that holdouts would face greater risk. Samurai to Skyscrapers Junichi Yamasaki, Kentaro Nakajima, and Kensuke Teshima’s paper, From Samurai to Skyscrapers: How Transaction Costs Shape Tokyo, is a fascinating and technical account of how sweeping changes put the relative prices of different-sized lots on a roller-coaster from the 19th century to the present. First, large estates were mandated as a way for the shogun to keep nobles under his close control. Then, with the Meiji Restoration, the nobles were released to sell their land, swamping the market and depressing prices. The value of land in former estate areas stayed low into the 1950s. But with the advent of skyscrapers – which need large base areas – the old estate areas first matched and then exceeded neighboring small-lot areas in central Tokyo. A meta-lesson from this reversal is that “efficiency” is a time-bound concept. One can imagine a 1931 urban planner imposing a tight street grid and forcing lot subdivision to unlock value on the depressed side of the tracks. That didn’t happen; instead, the large lots were a land bank that allowed a skyscraper boom right near the heart of a very old city, helping propel the Japanese economy beyond middle-income status. We should take a long, uncertain view of […]

Is affordability just, “You get what you pay for”?

In a tweet this week, the Welcoming Neighbors Network recommended that pro-housing advocates keep supply-and-demand arguments in their back pockets and emphasize simpler housing composition arguments: This advice makes an economist’s mind race. We know, after all, that supply and demand work. But we’re not so sure about composition changes. If “affordability” is achieved by building units that people don’t want (in bad locations, too small, lacking valued attributes), then the price-per-unit can be low without actually benefiting people on their own terms. Even if existing homes are bigger than many people want, at least some of the price decline from building smaller homes is the “you get what you pay for” effect. (Incidentally, this is the opposite concern from that held by econ-skeptics concerned about gentrification: they worry that new housing will be too good or that investment will upscale neighborhoods. This inverts the trope that economists “only care about money”.) A few days later, a Maryland state senator asked me that very supply-and-demand question: “What’s the evidence that large-scale upzoning leads to affordability?” This is a tough question. First, large-scale upzonings are very scarce. Second, even if one occurs, it’s not in an experimental vacuum. Three kinds of affordability Let’s specify that an upzoning likely promotes affordability in three ways: Supply and demand You get what you pay for Only pay for what you want The first channel is obvious – it explains why Cleveland is cheaper than Boston. The second source of affordability is valuable for people at risk of homelessness, but doesn’t make most people better off. The third source – what WNN recommends advocates emphasize – is that many regulations require people to pay for more housing (or pricey attributes) that they don’t want. In a lot of cases, the last two effects will go […]

Unpacking Emergent Tokyo with author Jorge Almazán

As foreigners, we are mesmerized by zakkyo buildings or yokocho, but within Japan, scholars, and authorities often ignore and neglect them as urban subproducts. In spite of their conspicuous presence and popularity, the official discourse still considers most of Emergent Tokyo as unsightly, dangerous, or underdeveloped. The book offers the Japanese readership a fresh view of their own everyday life environment as a valuable social, spatial, and even aesthetic legacy from which they could envision alternative futures.