Where the terms of the lease waive the tenant’s right to demand that the landlord mitigate damages, the waiver is permissible and negates Section 9-213.1 of the Code of Civil Procedure.The 1st District Appellate Court affirmed the decision of Cook County Circuit Judge Patricia S. Spratt.GTI Life Inc. rented a commercial space from the Takiff Properties Group Ltd. 2 in 2008 for a one-year period. The lease was extended through Oct. 31, 2014, with the rent eventually rising to $2,167 a month. On June 25, 2015, Takiff …