Final answer:
Yes, model codes require seismic requirements to be met in the modification of existing buildings.
Step-by-step explanation:
Yes, model codes do require seismic requirements to be met in the modification of existing buildings.
Seismic requirements are included to ensure that buildings can withstand seismic forces during an earthquake.
These requirements are specified in building codes, such as the International Building Code (IBC), which provides guidelines for construction and modification of buildings to protect public safety.