The Urban Land Institute's Bill Hudnut answer the question with a twist.
"Of course, outlying growth will continue, and certainly it can be done more efficiently. Certainly green space in poorer, older inner-ring areas should be valued highly and older homes that are structurally sound should be preserved and rehabilitated. And there is no doubt that infill development frequently involves gentrification, which can lead to displacement of low- and moderate-income people, and that city officials should be extremely sensitive to that issue when they court infill as a means of increasing tax base."
Thanks to Urban Land Institute
FULL STORY: Is urban infill development helpful or harmful?

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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.
Economic & Planning Systems, Inc.
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