posting on behalf of a friend, looking for advice. Chicago Illinois; My friend owns his condo unit in a multi unit building, he has some issues with the upstairs neighbors that happen to be renters of that unit.  His situation is below, open to advice, comments, suggestions, general starting points for him. I do not have much more information than what is provided. (see below)

Above tenants have destroyed our bathrooms due to constant nasty toilet water damages.. and constant noise violations have caused my family to suffer from sleep deprivation. Owner is in a legal battle to get them evicted but said that the pandemic doesn’t allow evictions... I read that if the tenants are a cause for health and property damage concern.. that means it’s an exception to evict...