Apartment houses containing more than one __________ dwelling units are considered a Group R-2 occupancy.

Apartment houses containing more than one dwelling unit are classified as a Group R-2 occupancy when there are two or more units. This classification is part of the International Building Code (IBC), which distinguishes between residential occupancies based on the number of units and the nature of the residence. Group R-2 is specifically designed for multifamily residences where occupants are primarily permanent residents, which include apartment buildings, dormitories, and similar structures.

The distinction at two or more units is significant because it enables separate building codes and safety standards to apply, ensuring that these types of buildings are designed with adequate fire safety measures, access for emergency services, and other requirements necessary for multi-unit living situations. Group R-1 typically refers to transient occupancies, like hotels or motels with fewer permanent residents.

Higher choices, like five or ten, would overstate the requirement for this classification, as a Group R-2 can apply to any apartment building with just two units or more; hence, it is important to understand that the correct threshold is the presence of two or more dwelling units.