1. Dept. of Urban and Regional Planning, Univ. of Illinois at Urbana-Champaign, 611 Taft Dr., Champaign, IL 61820 (corresponding author).
2. Dept. of Urban and Regional Planning, Univ. of Illinois at Urbana-Champaign, 611 Taft Dr., Champaign, IL 61820.
3. Laurie Johnson Consulting, 2550 Gough St. #6, San Francisco, CA 94123.