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The requirements of Chapter 9 of the Chicago Building Code shall be applicable throughout the existing building for the new occupancy classification based on the separation conditions set forth in Sections 1011.1.1.1 and 1011.1.1.2.
1011.1.1.1 Change of Occupancy Without Separation
Where a change of occupancy occurs in a portion of an existing building, and that portion is not separated from the remainder of the building with fire barriers having a fire-resistance rating as required in Section 508 the Chicago Building Code for separated occupancies, the entire building shall comply with all of the requirements of Chapter 9 of the Chicago Building Code applied throughout the building for the most restrictive occupancy classification in the building and with the requirements of this chapter.
1011.1.1.2 Change of Occupancy With Separation
Where a change of occupancy occurs in a portion of an existing building, and that portion is separated from the remainder of the building with fire barriers having a fire-resistance rating as required in Section 508 of the Chicago Building Code for separated occupancies or no separation is required by Section 508 of the Chicago Building Code, only that portion shall be required to comply with the requirements of Chapter 9 of the Chicago Building Code for the new occupancy classification and with the requirements of this chapter.

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