Non-transient boarding houses with __________ or fewer occupants are classified as Residential Group R-3.

Non-transient boarding houses are classified under the Residential Group R-3 category when they accommodate up to 16 or fewer occupants. This classification is significant because it outlines specific safety, health, and building code requirements that must be adhered to in order to protect the well-being of the residents.

Understanding that non-transient boarding houses with this specified capacity fall under a distinct category helps ensure they meet the necessary regulations for occupancy, such as fire safety standards, sanitation requirements, and structural integrity. The designation of 16 occupants as the upper limit reflects a recognition of the unique nature of boarding houses, as they differ from larger residential facilities or transient accommodations, which require different classifications and regulatory compliance.

The other numbers mentioned in the options represent capacities that exceed the limit set for the R-3 classification and would place the boarding house into a different classification, necessitating stricter regulatory measures.