This study investigates the impacts of upzoning and higher density zoning on housing development at the parcel level in the city of Portland (Oregon) during the period from 2000 to 2017. The study uses a quasi-experimental design to compare upzoned parcels and parcels in higher density zones with their corresponding control parcels that are identified through propensity score matching. The study shows that both upzoning and higher density zoning led to significantly greater development probabilities, higher development densities, and more housing supply. Upzoning could be an effective policy tool for increasing housing supply, particularly when it is applied to vacant and underutilized parcels.

本研究调查了俄勒冈州波特兰市2000年至2017年期间上分区和较高密度分区对包裹开发水平的住房开发的影响。该研究使用准实验设计比较了上层包裹和较高密度包裹密度区域及其对应的控制地块，这些区域通过倾向得分匹配来识别。研究表明，升级分区和更高密度分区都导致显着更大的开发概率，更高的开发密度和更多的住房供应。升级分区可能是增加住房供应的有效政策工具，尤其是在将其应用于空置和未充分利用的包裹时。