Which of the following is not a responsibility of the chief building official?

The chief building official (CBO) plays a critical role in ensuring compliance with building codes and safety standards within a jurisdiction. One of their primary responsibilities is to ensure that buildings are structurally sound (addressed in the second choice) and that they are safe for occupancy. This includes issuing orders to prevent unsafe occupancy, which is a vital part of maintaining public safety.

Conducting maintenance inspections can also fall under the CBO's responsibilities when it relates to ensuring that structures are being maintained according to code after they have been built. However, servicing plumbing and electrical work is typically not within the CBO's scope. Instead, that work is the responsibility of licensed professionals in those specific trades, as they require specialized training and knowledge to perform correctly and safely. Thus, the identification of servicing plumbing and electrical work as not being part of the CBO's responsibilities is accurate and reflects the professional boundaries within building management and inspection.