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Structural observations shall be provided for those structures assigned to Seismic Design Category D, E or F where one or more of the following conditions exist:
  1. The structure is classified as Risk Category III or IV.
  2. The structure is assigned to Seismic Design Category E, is classified as Risk Category I or II, and is greater than two stories above the grade plane.

Related Code Sections

A407.1 Guidelines for the Seismic Retrofit of Existing Buildings, Structural Observation
Structural observation, in accordance with Section 1704.6 of the International Building Code is required, regardless of seismic design category ...