765 ILCS 605/9.4
After receipt of summons in an action to take or damage a common element, the unit owners' association shall provide to the plaintiff a list of the unit owners, mortgagees and lienholders, and the plaintiff shall provide notice by certified mail to the unit owners, mortgagees and lienholders.
The notice shall include the following:
(6) statement that the mortgagee or lienholder may petition the court to intervene.
An immaterial error in providing notice shall not invalidate the legal effect of the proceeding.
(from Ch. 30, par. 309.4)
(Source: P.A. 86-826.)