Final answer:
A pre-printed or prepared addendum in a sales contract must be drafted by only the broker's attorney and can be used multiple times to ensure legal standards are met.
Step-by-step explanation:
In sales contracts, when a broker chooses to initiate the use of a pre-printed or prepared addendum, it must be prepared by only the broker's attorney and can be used more than once. This requirement ensures that any legal documentation added to the contract adheres to the appropriate legal standards and is crafted by someone with the requisite legal expertise. Real estate brokers, while knowledgeable about the sales process, are not typically attorneys and may not possess the legal expertise to draft contract addenda without professional guidance.