After a second and highly malignant ghost started manifesting at The Trask Hotel, the Trask Supervisor went to the Chicago Ghostbusters' office. Ron Alexander greeted him and asked their secretary Kim to pour him so coffee but she was busy with filing thirteen 302's. Ron poured some coffee and told him there was a hometown pride special that month for ghosts that look like a cow, bear or sock. He double checked they were just like the Ghostbusters from New York then told Ron about the ghost.
- In Ghostbusters Volume 2 Issue #7, the Chicago Ghostbusters' phone number, seen on the side of Ecto-15, is 655-2187.
- Adding in known area codes to the number, the only match being 312, the Chicago Ghostbusters' headquarters is in the Chicago Loop era, specifically The Loop, somewhere between West Monroe Street & South Canal Street and the Art Institute of Chicago
- In Ghostbusters Annual 2017, on page 23, in panel 2, the new Chicago Ghostbusters logo appears on the front face of Kim's cubicle. The logo was first revealed in the Dramatis Personae in Ghostbusters International #9.
- The 15th Crossing Over Virtual Trading Card, released on April 10, 2018, revealed the headquarters is located on Goose Island. 
- Ghostbusters Annual 2017
- Second City Ghostbusters