An institutional Group I-1 occupancy includes buildings where how many persons reside on a 24-hour basis?

An institutional Group I-1 occupancy is defined as a facility that accommodates more than 16 persons who are incapable of self-preservation due to mental or physical limitations. This designation typically applies to facilities like assisted living facilities, behavioral health centers, or group homes where care is provided to individuals who may require assistance with daily living activities.

The correct choice reflects the specific threshold set for the classification of such occupancies. By focusing on the number "more than 16," it aligns with building codes and regulations that classify institutions based on the level of care and support provided to residents. Selecting a different number would not correctly represent the criteria established for this occupancy classification in building safety and design standards.