A building sewer can serve additional buildings if they are what?

The correct response highlights that a building sewer can serve additional buildings if they are restricted from being sold separately from the primary building. This situation ensures that all properties share the same sewer system and remain connected to the primary infrastructure, allowing for a coordinated approach to waste management and plumbing requirements.

When buildings are not sold separately, it simplifies the regulatory and maintenance aspects of the sewer system, as all connected buildings remain under one ownership. This arrangement can prevent complications that might arise from independent use or ownership structures, such as liability for sewer line issues or compliance with regulations that may vary by property.

In contrast, if additional buildings were sold separately or used independently, complications could arise regarding responsibility for sewer maintenance, potential interruptions in service, and regulatory compliance. Therefore, establishing restrictions on the sale of additional buildings is a crucial aspect of managing a shared building sewer effectively.