Final answer:
The statement is true. Listing brokerages are required to keep records of all unsuccessful offers, either as a summary document or a full copy, for at least one year for compliance and accountability purposes.
Step-by-step explanation:
The statement that a listing brokerage must keep either the summary document or a copy of the entire offer for all unsuccessful offers for one year is generally true. Real estate regulations, which can vary by jurisdiction, typically require brokerages to maintain records of all transactions, including offers that are not accepted, for a specified period. These records are important for compliance with legislative requirements, and they serve as an important aspect of the professional accountability and transparency in real estate transactions.
In practice, this means that if an offer is made on a property and is not successful—whether it's rejected, outbid by another buyer, or withdrawn by the potential buyer—the brokerage responsible for the listing must keep a record of the offer. This can be either a concise summary that outlines the key points of the offer or an exact copy of the offer itself. These records must be securely stored for at least one year.