35 ILCS 200/10-80

The Director may promulgate rules and regulations as may be necessary to administer this Code, including but not limited to provisions that: (1) Preclude the issuance of a certificate of rehabilitation for any owner-occupied single family residence, owner-occupied multi-family residence, or cooperative where 30% or more of the dwelling space is new construction outside the existing structure. (2) Specify what costs are eligible to meet the 25% minimum specified under subsection (b) of Section 10-55, and make ineligible those costs attributable to new construction outside the existing structure. These regulations shall not preclude the issuance of a certificate of rehabilitation for a condominium.