American Planning Association (APA) and American Institute of Certified Planners (AICP)
http://www.planning.org
The American Planning Association and its professional institute, the American Institute of Certified Planners, are organized to advance the art and science of planning and to foster the activity of planning -- physical, economic, and social -- at the local, regional, state, and national levels. The objective of the Association is to encourage planning that will contribute to public well-being by developing communities and environments that meet the needs of people and society more effectively.

School of Design Real Estate Club
http://www.penndesignrealestate.com/Home.html
The Real Estate Cclub provides a platform for mentoring, speakers, panels, site visits, resume promotion, and career strategizing. Through the many resources it seeks to demonstrate how the interdisciplinary curriculum of PennDesign uniquely corresponds to the nature of real estate development and community building today.