Maps and Plats

The Maps and Plats Kiosk provides access to city aerial maps, 80-Acre (lots) maps, and structure basemaps that show existing building footprints and an address for each building.

Click on the link below to access the maps.

House Number Certification:

Under the City of Chicago Municipal Code, every building (regardless of zoning) within City Limits must have an official address (also known as House Number Certificate) as assigned by the Department of Transportation. No other entity issues official addresses within the City of Chicago. Numbers are assigned based upon frontage on or access to a street and are determined by the locations of doorways or driveways as reconciled against the City’s historical 80-Acre Maps. The Maps dictate the number that adheres to Chicago’s street grid and numbering system, thereby ensuring consistent numbering Citywide. CLICK HERE for the full process.

House Numbers / Building Address Certificates. 
CDOT Coach House Policy

Right-of-Way Adjustment Programs

The Maps and Plats Section of CDOT manages several programs that can be used to facilitate changes to the configuration of public streets and alleys.   Pending aldermanic support, successful review, and utility vetting of a proposed project, the resulting assembled parcel can be used for industrial, commercial or residential expansion or development.

Click on the links below to access the program applications:

CDOT Plan Review Committee

The Chicago Department of Transportation (CDOT) is responsible for reviewing development proposals that impact the public right-of-way.  Prior to the legislative approval for Planned Developments, Lakefront Protection Applications and Zoning Board of Appeals, applicants must receive approval from the CDOT Plan Review Committee (PRC).  Additionally over-sized driveways (any curb cut with a driveway greater than 25’ at the property line) will also need CDOT-PRC approval before a driveway permit is issued.

Plan Review Requirements  


Supporting Information Facts