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How to file an appeal online
https://www.facebook.com/CookCountyAssessorsOffice/videos/668149747309835/
How to file exemptions online
https://www.facebook.com/CookCountyAssessorsOffice/videos/565521844089851/
What is a Certificate of Error
https://www.facebook.com/CookCountyAssessorsOffice/videos/837723276750304/