210 ILCS 46/1-119: Owner.

"Owner" means the individual, partnership, corporation, association or other person who owns a facility. In the event a facility is operated by a person who leases the physical plant, which is owned by another person, "owner" means the person who operates the facility, except that if the person who owns the physical plant is an affiliate of the person who operates the facility and has significant control over the day to day operations of the facility, the person who owns the physical plant shall incur jointly and severally with the owner all liabilities imposed on an owner under this Act.