A property considered undesirable due to an event that has occurred there is:

The term "clouded" generally refers to something being obscured or made unclear, often in a metaphorical sense. It does not imply an undesirable status resulting from a specific event but rather suggests a lack of clarity or transparency, which does not fit the context of properties being marked by negative associations.

While "traumatized" describes an emotional or psychological state resulting from distressing experiences, it is not typically used in the context of properties or physical spaces. This term applies to individuals or groups rather than buildings or locations and does not convey an undesirable property status.

"Shrouded" indicates something that is covered or concealed, often implying mystery or secrecy. Although it can suggest an obscured nature, it does not inherently carry the connotation of undesirability stemming from a specific event, which is essential to the definition of a stigmatized property.