The Building Owners and Managers Association of Philadelphia (BOMA)
www.bomaphila.com
CCIM Institute
www.ccim.com
Co-Star Commercial Properties
www.costar.com
Loopnet
www.loopnet.com
PECO – Assistance listing commercial properties
www.peco.com/pecobiz/economic_development/Real+Estate.htm
Philadelphia CREW (Commerical Real Estate Women)
Tri-State Realtors Commercial Alliance
www.tristaterca.com/tristaterca
Urban Land Insitute (ULI)
www.uli.org