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The external codes and standards referenced in the Chicago Construction Codes are incorporated into and made part of the requirements of each code to the prescribed extent of each such reference and as further regulated in Sections 14A-1-102.4.1 through 14A-1-102.4.2.
Where a conflict exists between the adopting ordinance and a provision of a model code incorporated into the Chicago Construction Codes by reference, the adopting ordinance controls. Where a conflict exists between provisions of the Chicago Construction Codes and a standard referenced in a model code, the provisions of the Chicago Construction Codes control.
Where the extent of the reference to a referenced code or standard includes subject matter that is within the scope of the Chicago Construction Codes, the provisions of the Chicago Construction Codes take precedence over the provisions in the referenced code or standard.
The lawfully-established use and occupancy of any building or other structure existing on the effective date of a given provision of the Chicago Construction Codes continues to be lawful, even if the building or other structure does not conform to requirements for a new building of similar use or occupancy.
Exception: The Chicago Minimum Requirements for Existing Buildings, and provisions of the Chicago Construction Codes referenced in that code, apply to new and existing structures both prospectively and retrospectively.
Before initial legal occupancy, a building or portion of a building that has not been previously occupied for its intended purpose in accordance with the laws in effect at the time of its completion must be brought into compliance with the provisions of the Chicago Building Code for new construction or with the requirements of a valid permit.
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