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.