Final answer:
A written no brokerage relationship notice should be provided to customers usually before entering into a listing agreement or before showing the property, with specific timing depending on state laws.
Step-by-step explanation:
In the context of real estate transactions, a written no brokerage relationship notice needs to be provided to customers to inform them of the nature of the broker's relationship with them. Typically, this notice must be given before, or at the time of, entering into a listing agreement, or before showing the property, as part of the broker's disclosure obligations. The exact timing may vary depending on the state's laws where the transaction is taking place. It's essential for brokers to follow these regulations to maintain transparency and protect the interests of all parties involved in the transaction.