The answer depends on your condominium's declaration and bylaws, including any written rules and regulations you may have. These documents determine the rights and remedies you have at your disposal. I would approach a thorough reading of the documents with two considerations in mind, both of which you mentioned in your question: (1) are "businesses" prohibited and if so, what constitutes a "business," and (2) what rights to unit owners have against others that are causing destruction to common areas and individual units?
If you need help with the documents, I would suggest finding a good real estate or condominium attorney. The Illinois State Bar Association has a good referral program at www.illinoislawyerfinder.com
NOTE: This answer is not intended to be legal advice and should not be construed in that way. This answer does not create an attorney-client relationship and no such relationship may be created absent a signed retainer agreement. The author is licensed in Illinois only, and his answer is for educational purposes alone.