| There is probably a local or county historical society in the area. Contact them for history about the apt building and the land it stands on. There may be earlier reports or even a written history (newspaper reports, etc.) of others' experiences.
Or, call the local public library (reference dept). Libraries keep files on information like this. (In the area where I work at a library, there is a haunted bar/restaurant, cemetery, and a couple of houses. We have thick files on the histories and sightings.) | 
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