From the Chicago Tribune:

Even as the Daley administration seeks
a company willing to pay big bucks to put its corporate logo on the
Southeast Side toll road, City Hall on Friday issued a “request for
proposals” to marketing firms interested in surveying city buildings,
events, programs and even vehicles and then seeking corporate sponsors
willing to shell out money to be associated with them.

Chicago already privatized management of the Skyway until 2104 for $1.8 billion.