0094-1190/$ see front matter 2013 Elsevier Inc. All rights reserved. http://dx.doi.org/10.1016/j.jue.2013.08.001 ⇑ Corresponding author at: UCLA, Department of Economics, 8283 Bunche Hall, Los Angeles, CA 90095-1477, United States. E-mail address: lboustan@econ.ucla.edu (L.P. Boustan). 1 In 1960, 79 percent of suburban housing units were detached, single-family dwellings. Over 80 percent of sin...