Allegedly voluntary program deemed an actual requirement; developers had protested.
In Arlington County, a judge ruled that the county government had exceeded its legal authority under state law when asking developers to volunteer to sell up to 10% of their new housing units at affordable rates, often in exchange for density bonuses. Of 50 applications in the past four years, all but already affordable housing projects had built additional units of affordable housing, a figure the judge interpreted to mean that the policy was actually required. The case arose after the county offered to allow a developer to build two buildings with more floors than allowed by zoning in exchange for affordable housing units, and the developer protested the "voluntary" request.
Thanks to David Gest
FULL STORY: Affordable Housing Guidelines Rejected

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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research