Which condition does NOT need to be met for an establishment to be attached to a residence?

In this context, the correct answer focuses on the specific conditions required for an establishment, such as a salon or similar business, to be legally and functionally attached to a residence. The requirement for additional space for waiting clients beyond the salon does not necessarily pertain to the structural or operational integrity needed to maintain separation between business and residential purposes.

While having a separate entrance, a complete wall from floor to ceiling, and operating without disturbing the residence are essential requirements that ensure the two functions can coexist without compromising safety, legality, or comfort, the provision of extra waiting space is more about convenience than compliance with regulatory standards. Thus, while it is beneficial for client experience, it is not a stipulated condition for legal attachment to a residence.