A listing licensee would be in violation of the Real Estate Board Regulations if which of the following facts known by him were NOT disclosed to the buyers?

While this information is relevant to the value and desirability of the property, it is generally considered a public fact that buyers can research on their own. Therefore, failing to disclose this fact does not constitute a violation of regulations, as it does not directly pertain to confidential negotiations.

Although this is an important consideration for potential buyers, it is typically categorized as a moral or ethical disclosure rather than a legal requirement. Laws regarding the disclosure of past crimes can vary by jurisdiction, but not disclosing this fact does not automatically violate real estate board regulations.

While this information is critical for the buyer's awareness of property conditions, it is generally classified under property defects that must be disclosed. However, it does not relate to the negotiation process in the same way that the terms of other offers do, making it less critical to the violation of regulations.