Publications

  • Research Area: Land Use ×
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  • Minimum parking requirements and housing affordability in New York City

    Many cities throughout the United States require developers of new residential construction to provide a minimum number of accompanying off-street parking spaces. However, critics argue that these requirements increase housing costs by bundling an oversupply of parking with new housing and by reducing the number of units developers could otherwise fit on a given lot. In this article, we explore the theoretical objections to minimum parking requirements and the limited empirical literature. We then use lot-level data and GIS to analyze parking requirements in New York City to determine to what extent they are already effectively sensitive to transit proximity. Finally, we examine developer response to parking requirements by comparing the number of spaces that are actually built to the number required by applicable zoning law. Our results indicate that the per-unit parking requirement in New York is, on average, lower in areas near rail transit stations, but the required number of spaces per square foot of lot area is higher, on average, in transit accessible areas. We also find that by and large, developers tend to build only the bare minimum of parking required by zoning, suggesting that the minimum parking requirements are binding for developers, as argued by critics, and that developers do not simply build parking out of perceived marked need. Our results raise the possibility that even in cities with complex and tailored parking requirements, there is room to tie the requirements more closely to contextual factors. Further, such changes are likely to result in fewer parking spaces from residential developers.

  • How do New York City’s Recent Rezonings Align With its Goals for Park Accessibility?

    In 2007, New York City adopted a long-term sustainability plan that announced a goal of ensuring that almost every New Yorker lives within a ten minute walk of a park of substantial size. At the same time, policymakers are rewriting the City’s land use map through an unprecedented series of neighborhood level rezonings that involve changing the use type and residential capacity of affected lots or groups of lots. Despite the confluence of these interventions, no research has analyzed how the rezonings interact with the City’s park infrastructure, and specifically, whether residential capacity changes in areas close to parks differ from those in areas further away. In this research, we employ a database of every tax lot in New York City to investigate how well the City-initiated rezonings correlate with the goal of providing New Yorkers with good access to the City’s parks. Our results indicate a mixed picture; while most ‘upzoned’ lots (lots where residential capacity was added) were near parks, we also find that the majority of ‘downzoned’ lots (lots where residential capacity was reduced) were also close to parks. The net impact of these rezonings was a modest increase in residential capacity for the City as a whole, but the increases were disproportionately focused in areas further from parks.

  • Silver Bullet or Trojan Horse? The Effects of Inclusionary Zoning on Local Housing Markets in the United States

    Many local governments are adopting inclusionary zoning (IZ) as a means of producing affordable housing without direct public subsidies. In this paper, we use panel data on IZ in the San Francisco metropolitan area and Suburban Boston to analyze how much affordable housing the programs produce and how IZ affects the prices and production of market-rate housing. The amount of affordable housing produced under IZ has been modest and depends primarily on how long IZ has been in place. Results from Suburban Boston suggest that IZ has contributed to increased housing prices and lower rates of production during periods of regional house price appreciation. In the San Francisco area, IZ also appears to increase housing prices in times of regional price appreciation but depresses prices during cooler regional markets. There is no evidence of a statistically significant effect of IZ on new housing development in the Bay Area.

  • Building Environmentally Sustainable Communities: A Framework for Inclusivity

    The U.S. Department of Housing and Urban Development (HUD) has decided to include two key goals in all of its programs: encouraging sustainable communities and enhancing access to opportunity for lower-income people and people of color. This paper examines the relationship between these two goals through a literature review and an original empirical analysis of how these goals interact at the neighborhood and metropolitan area levels. We also offer policy recommendations for HUD.

  • Community Benefits Agreements: A New Local Government Tool or Another Variation on the Exactions Theme?

    Community benefits agreements (CBAs) are the latest in a long line of tools neighbors have used to protect their neighborhood from the burdens of development, and to try to secure benefits from the proposed development. This Article canvasses the benefits and drawbacks various stakeholders perceive CBAs to offer or to threaten, and reviews the legal and policy questions CBAs present. It recommends that local governments avoid the use of CBAs in land use approval processes unless the CBAs are negotiated through processes designed to ensure the transparency of the negotiations, the representativeness and accountability of the negotiators, and the legality and enforceability of the CBAs’ terms.

  • How Have Recent Rezonings Affected the City’s Ability to Grow?

    How Have Recent Rezonings Affected the City’s Ability to Grow? is the first comprehensive statistical analysis of the City’s rezoning strategy. The report examines the net impact of the 76 rezonings initiated by the City between 2003 and 2007.  It finds that, of the 188,000 rezoned lots citywide, 86% were rezoned to reduce or limit new development through either a downzoning or a contextual-only rezoning.  Nevertheless, the 14% of lots that were upzoned resulted in a net gain of 100 million square feet of new capacity citywide. The report explores the likelihood that this new capacity will be developed for residential use, and examines the characteristics of neighborhoods that gained new capacity and of those that lost capacity.

  • Underused Lots in New York City

    Despite a robust real estate market for most of this decade, researchers and policymakers have observed that many areas of New York City have remained built out well below their zoning capacity. This study aims to contribute to our understanding of urban redevelopment by compiling and analyzing a large database of underdeveloped lots in the City. We identify about 200,000 such lots as of 2003 that were built out at less than 50% of their zoning capacity, representing about a quarter of all residentially zoned lots. Of these, about 8% were redeveloped during the subsequent four years. Our preliminary analysis reveals that underdeveloped lots are primarily made up of low density 1-4 family houses and are disproportionately located in poor and minority neighborhoods. We plan to use this analysis as the foundation for further analysis to assess whether market failures and regulatory and other barriers impede desirable development in mature cities.

  • 31 Flavors of Inclusionary Zoning: Comparing Policies From San Francisco, Washington, DC, and Suburban Boston

    As housing costs have risen in the U.S. and federal subsidies for affordable housing programs have declined, inclusionary zoning (IZ) has become an increasingly popular local policy for producing low-income housing without direct public subsidy. The structure of IZ policies can vary in a number of ways; consequently, there is not yet a consensus about what policies constitute “true” inclusionary zoning. In this paper we compare the ways in which IZ programs have been structured in three regions in which it is relatively widespread and long-standing. Our results demonstrate that IZ programs are highly complex and exhibit considerable variation in their structures and outcomes. In the San Francisco Bay Area, IZ programs tend to be mandatory and apply broadly across locations and structure types, but attempt to soften potential negative impacts with cost offsets and alternatives to on-site construction. In the Washington DC area, most IZ programs are also mandatory, but have broader exemptions for small developments and low-density housing types. IZ programs in the Suburban Boston area exhibit the most withinregion heterogeneity. In this area, IZ is more likely to be voluntary and to apply only to a narrow range of developments, such as multifamily or age-restricted housing, or within certain zoning districts. The amount of affordable housing produced under IZ varies considerably, both within and across the regions. The flexibility of IZ allows planners to create a program that accommodates local policy goals, housing market conditions and political circumstances.

  • No Renters in My Suburban Backyard: Land Use Regulation and Rental Housing

    Academics and policymakers have argued that the ability of low- and moderate-income families to move into desirable suburban areas is constrained by the high cost of housing. Local zoning and other forms of land use regulation are believed to contribute to increased housing prices by reducing supply and increasing the size of new housing. Suburban restrictions on rental housing are particularly likely to reduce mobility for low-income families. In this paper, I employ an instrumental variables approach to examine the effects of zoning on the quantity and price of rental housing in Massachusetts, using historical municipal characteristics to instrument for current regulations. Results suggest that communities with more restrictive zoning issue significantly fewer building permits for multifamily housing but provide only weak evidence of the effects of regulations on rents. The lack of effects on rents may reflect the low level of multifamily development, while analysis is complicated by development of subsidized housing under the state’s affordable housing law.

  • The Effects of Inclusionary Zoning on Local Housing Markets

    This study evaluates the impact of Inclusionary Zoning policies on housing markets in the San Francisco, Washington D.C. and suburban Boston areas. The analysis provides local decision-makers with valuable evidence on the impacts of IZ—a popular but often-controversial affordable housing policy.  The policy brief includes an update from February 2010, summarizing additional research that has been completed since the original publication in March, 2008.