In a single building with common structural elements, how many dwellings are required to be considered Multifamily Residential?

• A. 5
• B. 3
• C. 2
• D. 4

Answer: (A)

Five or more dwellings within a single building with shared structural elements meet the definition of Multifamily Residential. This threshold signals that the building functions as one structure serving multiple households with shared systems and spaces, which brings specific design and performance considerations for ventilation, acoustics, and safety. Fewer than five units do not meet that threshold and are treated as other residential types, so the five-dwelling cutoff is what distinguishes Multifamily Residential.