Zoning Links:
City of Chicago Zoning:
http://www.cityofchicago.org/Zoning/
Department of Construction and Permits (DCAP):
http://egov.cityofchicago.org/city/webportal/portalEntityHomeAction.do?entityName=Construction+and+Permits&entityNameEnumValue=124
Porch Information:
http://www.cityofchicago.org/dcap/porch_intro.html