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(40) Qualified tangible personal property used in the construction or operation of a data center that has been granted a certificate of exemption by the Department of Commerce and Economic Opportunity, whether that tangible personal property is purchased by the owner, operator, or tenant of the data center or by a contractor or subcontractor of the owner, operator, or tenant. Data centers that would have qualified for a certificate of exemption prior to January 1, 2020 had Public Act 101-31 been in effect may apply for and obtain an exemption for subsequent purchases of computer equipment or enabling software purchased or leased to upgrade, supplement, or replace computer equipment or enabling software purchased or leased in the original investment that would have qualified. The Department of Commerce and Economic Opportunity shall grant a certificate of exemption under this item (40) to qualified data centers as defined by Section 605-1025 of the Department of Commerce and Economic Opportunity Law of the Civil Administrative Code of Illinois. For the purposes of this item (40): "Data center" means a building or a series of buildings rehabilitated or constructed to house working servers in one physical location or multiple sites within the State of Illinois. "Qualified tangible personal property" means: electrical systems and equipment; climate control and SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468