N.Y.C. Admin. Code § EBC 1103: Section EBC 1103: Structural

1103.1 Compliance with Chapter 7 of the New York City Existing Building Code.

Additions to existing buildings or structures are new construction and shall comply with the New York City Building Code and Chapter 7

1103.2 Flood hazard areas.

Additions and foundations in flood hazard areas shall comply with Appendix G of the New York City Building Code and Chapter 7.

1103.3 Structural condition assessment.

Additions to existing buildings or structures shall require an initial structural condition assessment in accordance with Section 704.2. Where the addition to the existing building or structure includes a structural alteration or an increase in loads applied to the existing building or structure, a detailed structural condition assessment in accordance with Section 704.3 is also required.