恐怖分子袭击后的美国规划建筑界

恐怖分子 2 0 0 1年 9月 11日袭击了纽约和华盛顿 ,美国的规划师和建筑师在哀悼遇难者的同时 ,从专业角度探讨如何建设更完善的城市和社区     

Privileging the private home: a case of persuasive storytelling in early twentieth-century professional discourses

The private, detached single-family house has long been a dominant feature in the cities, towns, and suburbs of the United States to a much greater extent than in most other Western nations. To this very day, the private home is considered a constitutive element of the “American Dream.” This paper seeks to uncover some of the mechanisms through which this house acquired commanding presence in the American imagination and, consequently, in American metropolitan space. Specifically, the paper turns to professional discourses from the early 1900s. The paper argues that city-building experts from that time period – architects, housing reformers, and urban planners – collectively envisioned the detached single-family house as having a privileged claim to the American city and converted this vision into a persuasive story. Through their storytelling, the experts helped craft a number of government strategies that defended the dominant position of the single-family dwelling in the American city through the remainder of the twentieth century.     

Sustainable housing with mixedweight strategy—A case study

The aim of this research work is to demonstrate how an innovative mixedweight solution can lead to achieve more sustainable housing constructions, having in mind that functional aspects related with comfort—thermal, acoustical and natural illumination—should be safeguarded. The integrated accomplishment of all these aspects is difficult and not easily predictable. That is why, for this comparative study, two Test Cells were built and monitored. The proposed mixedweight strategy was evaluated on a Test Cell made with a heavyweight central area, theoretically conceived to lodge the resting areas of a house: bedrooms, bathroom and living room. North and South envelope façades, pavement and covering are lightweight and lodge the less protected areas, destined for working (office, dining room and kitchen) and a corridor?sunspace, respectively. These compartments also take the role of thermal and acoustical barriers to the resting zone. This mixedweight strategy allowed significantly less environmental cost in comparison to a conventional heavyweight constructive solution using hollow brick and steel-reinforced concrete evaluated on a Reference Test Cell and conceived in a monozone layout. The main aspects and results of this study are presented here.     

Future Directions in Housing and Public Health: Findings From Europe With Broader Implications for Planners

Problem: Chronic diseases such as asthma are rising at alarming rates in the United States and worldwide. Housing environments play an important, underappreciated role in these trends.

Purpose: In this article, we document the magnitude of the association between housing conditions and asthma and related respiratory symptoms, present examples of new systems for addressing adverse effects of housing on health, and discuss how planners might require or encourage such innovations.

Methods: We use logistic regressions based on household survey data from seven European cities to show the magnitude of the association between housing conditions and noise annoyance and the exacerbation of asthma and related respiratory symptoms. To support our argument that new housing intervention systems show great promise for alleviating current housing-related health challenges, we offer several different examples of green building criteria that incorporate health measures.

Results and conclusions: After taking into consideration individual-level characteristics, we found that respondents across a range of cities who were strongly annoyed by general neighborhood noise had twice the odds of a doctor-diagnosed asthma attack or related respiratory symptom than those not at all annoyed. Those strongly annoyed by traffic noise had 68% higher odds. Drainage problems at the housing unit were associated with 54% higher odds of experiencing respiratory symptoms, building structural problems with 27% higher odds, and a leaky roof with 35% higher odds. We identify healthy housing development, construction, and housing rehabilitation systems as promising initiatives for addressing the web of associations between housing and health. We suggest that funds such as Community Development Block Grants or housing trusts could subsidize such efforts, and various existing planning processes could incorporate health requirements or scoring criteria.

Takeaway for practice: There is compelling evidence that housing conditions are associated with poor health. Planners should inform themselves about these and identify opportunities to incorporate health considerations into planning that affects housing.

Research support: None.     

Is planning delay really a constraint in the provision of housing? Some evidence from Israel

This paper revisits the claim that a causal link exists between the inflexibility of land-use planning and low elasticity of housing supply. A theoretical model of factors impacting district-level planning is presented alongside a model of the impact of planning delay on housing supply. The models are estimated for the Tel Aviv district using detailed data covering a 12-year period. Results show significant impacts on planning delay due to plan, municipality and district planning commission characteristics. House prices exert a positive effect on planning speed and municipal funding acts as a supply constraint. While planning delay does not impact housing supply, delay uncertainty has a negative impact and acts as a constraint.     

开发商参与保障房配建市场化模式研究

保障房配建是我国保障房建设的重要模式,而开发商配建动力不足严重制约着其顺利推行。在阐释保障房配建运作模式现状,剖析开发商配建积极性低的原因基础上,从土地供应、配建保障房的商品房类型、房屋产权、租金设定与支付、准入与退出管理5 个方面进行了基于市场化的保障房配建模式优化;运用博弈模型进行可行性论证,得出的结论是市场化运作模式可行;根据保障房配建存在的问题,提出完善相关法规及政府监督机制、合理规划配建比例等方面的政策措施,以激励开发商进行保障房配建,完善我国保障房配建制度。     

The evolution process of Chicago’s industrial land-use policy

Despite the industrial restructuring process that occurred between 1970s and 1980s in the Western World, the city of Chicago adopted an innovative land-use industrial policy for curbing the structural decline of manufacturing. The main aim was to preserve living wages manufacturing jobs for the Chicago residents that could not access the service sectors. Chicago’s industrial land-use policy experience, both in its historical and future perspectives, is an interesting top-down municipal policy that shows how the relationship between land-use planning and manufacturing shapes the city not only in spatial terms but also in social and economical terms.     

Planning and Affordable Housing in Australia and the UK: A Comparative Perspective

Land use planning systems in Australia and the United Kingdom (UK) share a common history. In both nations, one objective of town planning has been to improve housing conditions for the urban poor and facilitate sufficient housing supply for growing post-war populations, with UK legislation serving as a model for Australia, at least until the Town and Country Planning Act 1947. Since this time however, approaches have diverged. In the UK, housing assistance and the land use planning system have co-evolved, with planning an important tool for securing affordable housing, particularly in England. In contrast, a deep cleavage between urban planning and housing policy persists in Australia. Drawing on a series of studies undertaken separately by the authors over the past decade which concentrate on Australia and England, the paper compares urban and housing policy in both nations, and examines planning system performance in securing new affordable homes.     

Exploring the socio-spatial patterns of diversity and its influencing factors at a metropolitan scale

ABSTRACT

Responding to a critical gap in diversity studies which have been mostly dedicated to Western contexts, and setting the scene for celebrating an ignored issue in the Iranian context are the aims of this study. To these ends, Tehran is selected, and its socio-spatial patterns of diversity are studied through a GIS-based analysis. Results suggest that housing and residential diversity are highly correlated. Influencing factors of diversity also indicate that diverse neighborhoods are usually smaller ones with higher population density. Surprisingly, land-use diversity does not have any significant relationship with housing and residential diversity in Tehran neighborhoods. Residential diversity usually occurs in neighborhoods, where jobs opportunities are more available, open spaces are more frequent, and individuals feel more secure. Recovering balances between residential and housing predictory variables and planning in the scale of neighborhoods rather than urban regions are what planners should seek through the notion of planning for diversity.     

美国包容性区划对我国保障性住房建设的启示

通过对现阶段我国保障性住房建设主要特征与问题的认识,提出保障性住房建设应转变传统的供给方式。转变方式的一个重要方面是,借鉴美国包容性区划实践经验,在城市中心区普通商品房开发项目中配建一定比例的保障性住房。通过对美国包容性区划经验的学习以及中美相关背景的比较,认为我国目前采用与包容性区划性质相似的保障性住房配建政策不仅具有重要的现实意义,同时具有较强的政策执行优势。最后,论文提出当前采用保障性住房配建政策尚需解决的主要问题和解决建议。     

Death to Single-Family Zoning…and New Life to the Missing Middle

Abstract

Planners in the United States and Canada should stop defending single-family zoning, the single most harmful widely used practice in planning. In the century since first adoption, it has exacerbated both inequality and climate change. Land use regulations that make a singly occupied, detached house on a large parcel the only allowable option should be replaced, wherever they exist, with new rules that allow medium-density, or “Missing Middle,” housing to be built by right. These changes should be applied broadly at the scale of an entire city or, best of all, a state, rather than piecemeal. Encouraging recent events in Minneapolis (MN), Oregon, and elsewhere show that single-family zoning is being seriously challenged for the first time, but more progress is needed.     

It’s Time to End Single-Family Zoning

Abstract

Local planning in the United States is unique in the amount of land it reserves for detached single-family homes. This privileging of single-family homes, normally called R1 zoning, exacerbates inequality and undermines efficiency. R1’s origins are unpleasant: Stained by explicitly classist and implicitly racist motivations, R1 today continues to promote exclusion. It makes it harder for people to access high-opportunity places, and in expensive regions it contributes to shortages of housing, thereby benefiting homeowners at the expense of renters and forcing many housing consumers to spend more on housing. Stacked against these drawbacks, moreover, are a series of only weak arguments in R1’s favor about preferences, aesthetics, and a single-family way of life. We demonstrate that these pro-R1 concerns are either specious, or can be addressed in ways less socially harmful than R1. Given the strong arguments against R1 and the weak arguments for it, we contend planners should work to abolish R1 single-family zoning.     

Achieving Regional Housing Planning Objectives: Directing Affordable Housing to Jobs-Rich Neighborhoods in the San Francisco Bay Area

Problem, research strategy, and findings: Low-income households face affordability issues and are often forced to live in areas with limited job access and inadequate transportation. Local communities exacerbate these problems through exclusionary zoning. We study the impact of the Association of Bay Area Governments (ABAG) change in allocation formula under California’s affordable housing mandate. The old policy followed a fair share strategy, whereas the new policy requires local jurisdictions to locate mandated affordable housing units in jobs-rich areas. We compare affordable housing produced in the region before and after ABAG adopted the jobs-housing policy; we also compare the new patterns to the location of market-rate housing and to the experiences of San Diego (CA) and Los Angeles (CA), both of which retain fair share allocation. We do not control for variables that may have affected affordable housing location. ABAG’s policy shift is associated with a 104% improvement in the balance of housing and jobs at the local level; affordable housing units are more likely than market-rate housing to locate in jobs-rich areas, which may indicate that localities prioritize affordable housing. We also find that more affordable housing locates in such areas in the San Francisco Bay Area (CA) than in San Diego or Los Angeles.

Takeaway for practice: A voluntary regional government in a state with mandatory affordable housing requirements can affect the production and distribution of affordable housing. A total of 25 U.S. states require localities to include affordable housing elements in their comprehensive plans; we suggest that regional and local planners use these opportunities to meet multiple policy goals by directing affordable housing to jobs-rich neighborhoods.     

Culture Change as Identity Regulation: The Micro-Politics of Producing Spatial Planners in England

Attempts to reform planning systems often draw into question the attitudes and commitments of the planners charged with realising change. Since 2001 the English planning system has been subject to a complex series of reforms designed to modernise its workings. Central to this have been calls for a culture change, focusing on professional planners in the public sector. The discourse of culture change is rooted in the managerialist thinking that has been central to long-term processes of state restructuring. Du Gay describes this as a project designed to change the identities of public servants. This article therefore explores the messy ways in which reform has sought to re-regulate the identities of English planners, and the response from planners themselves as they have begun to negotiate these changes to their identities and practices. It is argued that attentiveness to the lived experience of change can help to inform a more critical and nuanced account of the normative promises of planning reform.     

So what if housing research is thriving? Researchers' perceptions of the use of housing studies

By various indicators of scholarly viability,housing research is thriving. Its relevance,however, is unclear. This paper addressesquestions concerning the practical significanceof housing research. Is anyone actually usingthe findings? If so, who, how, and to whichends? A survey of 41 authors of articles,published in this journal from 1996 to 1999,provides insights into perceptions by housingresearchers of how practitioners andpolicymakers use their work.Most respondents think that their studies havepractical significance. However, they oftensee the responses to research recommendationsas inadequate because of ineffectivecommunication and presentation of findings,lack of time and interest on the part ofpolicymakers, disjointed professional networks,and competing policy goals. The results ofthis study bring into focus several issuesmeriting further research, including theapparent lack of effective policy engagement byresearchers, the political and economic contextof research, the perspectives of policymakersand practitioners, and the role of comparativeresearch in knowledge transfer.     

Quantifying a century of state intervention in rental housing in Germany

The paper aims at measuring the general state intervention in rental housing market in Germany from 1913 through 2015. Four policy classes are considered: Incentives for social housing, tenant protection, housing rationing, and rent controls. Based on a legislation analysis, for each class an index measuring the degree of regulation is constructed. The indices reflect dramatic increases in regulations during and after the World Wars. The 2010s are characterized by a surge in all classes of regulations related to the growing housing scarcity in large cities due to interregional migration leading to a geographical mismatch between housing supply and demand.     

Planning for Mixed Use: Affordable for Whom?

Problem, research strategy, and findings: Mixed-use zoning is widely advocated to increase density; promote active transportation; encourage economic development; and create lively, diverse neighborhoods. We know little, however, about whether mixed-use developments affect housing affordability. We question the impact of mixed-use zoning on housing affordability in Toronto (Canada) between 1991 and 2006 in the face of waning government support for affordable housing and increasing income inequality due to the occupational restructuring accompanying a shift to a knowledge-based economy. We fi nd that housing in mixed-use zones remained less affordable than housing in the rest of the city and in the metropolitan region. High-income service occupations experienced improved affordability while lower wage service, trade, and manufacturing occupations experienced stagnant or worsening affordability. Housing in mixed-use zones is increasingly affordable only to workers already able to pay higher housing costs. Our findings are limited to Canada's largest city but have lessons for large North American cities with similar urban economies and housing markets.

Takeaway for practice: Mixed-use developments may reduce housing affordability in core areas and inadvertently reinforce the sociospatial inequality resulting from occupational polarization unless supported by appropriate affordable housing policies. Planners should consider a range of policy measures to offset the unintentional outcomes of mixed-use developments and ensure affordability within mixed-use zones: inclusionary zoning, density bonuses linked to affordable housing, affordable housing trusts, and other relevant methods.     

The British housing market: contained and exploding

While the long run trend in housing prices in the UK has been upwards since the mid-1950s the post 1998 boom represents short term volatility and threatens stability in the wider economy. This paper argues the fundamental reason driving both the rise in the real price of housing and its increased volatility is the increasing constraint on the supply or urban space applied by the British system of land use planning and its attempts to contain urban areas. Housing is an economic good and the supply of available housing space is allocated through the market. As incomes rise people try to purchase more space. This not only drives up the price of space and so housing but it also makes the supply of housing more inelastic and so the price more volatile. Housing increasingly behaves like a financial asset marker rather than a market for housing services.     

Dialectics of Power: The Case of Tulihta Land-use Agreement

Case studies of planning which involve criminal corruption are rare. The article presents a Finnish court case known as “Tulihta”, concerning the breach of a land purchase contract and treachery in the preparation of the detailed plan for the land property in question, during 1989–1993. The case is analysed from the power perspective by using a framework developed by Mäntysalo and Rajaniemi (2003 Mäntysalo, R. and Rajaniemi, J. 2003. Vallan ulottuvuuksia maankäytön suunnittelussa. Synteesi, 22(3): 117–136.  [Google Scholar]). In the framework, two sets of binary characteristics of power, namely power as control and as ability, and explicit and implicit power, are combined into a horizontal-vertical field. The case analysis is aimed to test the applicability of the framework, as well as to reveal the manifold aspects of power at play in a land-use planning process.     

The British housing market: contained and exploding1

While the long run trend in housing prices in the UK has been upwards since the mid‐1950s the post 1998 boom represents short term volatility and threatens stability in the wider economy. This paper argues the fundamental reason driving both the rise in the real price of housing and its increased volatility is the increasing constraint on the supply or urban space applied by the British system of land use planning and its attempts to contain urban areas. Housing is an economic good and the supply of available housing space is allocated through the market. As incomes rise people try to purchase more space. This not only drives up the price of space and so housing but it also makes the supply of housing more inelastic and so the price more volatile. Housing increasingly behaves like a financial asset marker rather than a market for housing services.