What is the term for a building or portion thereof that contains not more than two dwelling units?

The term "dwelling" is defined in building and housing codes as a structure that is designed for occupancy as a residence. In the context of your question, a dwelling can refer to various types of residential accommodations, including single-family homes and multifamily structures that house up to two dwelling units. This definition aligns with the overall understanding and codes regulating building occupancy and safety.

Choosing "apartment," "condominium," or "unit" does not accurately represent the architectural and legal definition that includes two dwelling units. An apartment generally refers to a single unit within a larger building, while a condominium typically signifies a type of ownership where individuals own their unit but share common spaces. "Unit" is a broad term that lacks the specificity to clearly convey the presence of two dwelling units within a single building structure in this context. Thus, "dwelling" is the most appropriate and precise term for a building or portion thereof containing not more than two dwelling units.