What is the key factor defining sub-agency in real estate practice?

The key factor defining sub-agency in real estate practice is that it involves an agent representing a client of another agent. In this context, sub-agency occurs when one agent (the sub-agent) works on behalf of the client of another agent (the primary agent). The sub-agent owes fiduciary duties to the buyer or seller, as per the original agreement with the primary agent. This relationship is often established through cooperation agreements, allowing the sub-agent to assist in transactions while still serving the best interests of the principal.

In contrast, other choices focus on different aspects of agency relationships. Representing one's own client or solely focusing on buyer representation refers to the direct agent-client relationship rather than the interaction involving multiple agents. Similarly, serving multiple clients equally does not establish the specific relationship unique to sub-agency, which emphasizes the connection between the sub-agent and the principal of another agent. Understanding these distinctions helps clarify how sub-agency operates within the broader framework of real estate agency relationships.