Under what condition can Vivian tour a property listed with Big Tree Realty without entering into an agency relationship?

Vivian can tour a property listed with Big Tree Realty without entering into an agency relationship if she declines the agency relationship in writing before the visit. This is significant because an agency relationship typically creates certain obligations and responsibilities for both the agent and the principal. In Indiana real estate practice, a potential buyer has the right to decline an agency relationship with the broker before engaging in property tours, which allows them to explore properties without being bound by the agent's fiduciary duties. By providing a written statement of her choice, Vivian clarifies her position and protects herself from the implications of an agency relationship during the property tour.

The other options relate to situations that either establish or complicate the agency relationship rather than avoiding it. For instance, signing a contract with Big Tree would clearly define an agency relationship. A dual agency might create conflicts of interest that necessitate a different kind of agreement. Having a referral from another broker does not negate the need for an agency relationship unless she explicitly states her intention to decline one in writing.