Which of the following is considered a material fact that must be disclosed in a property sale?

In the context of property transactions, a material fact refers to information that could affect a buyer's decision to purchase the property. Among the options, past water damage to the property is a clear example of a material fact that must be disclosed. This information directly pertains to the condition of the property and can influence the buyer's perception of its value, safety, and potential repair costs.

Disclosing past water damage is crucial because it reveals issues related to the property's integrity, which could impact its current state and future maintenance needs. Buyers have the right to know if the property may have structural concerns or if there is a possibility of ongoing problems related to moisture, mold, or other related issues.

The other scenarios, while sensitive, do not directly relate to the physical condition of the property in the same way. A tenant's medical status or the previous owner's suicide may not significantly affect the property’s condition or value, and many jurisdictions have laws prohibiting the disclosure of certain personal information due to privacy concerns. Therefore, these situations typically do not need to be disclosed in the same manner as material facts about the property's physical state.