Japanese realtors deem some of their properties as "stigmatized", meaning something bad happened there: a murder, suicide, or something equally unpleasant.
murder, murder-suicide, family suicide, individual suicide, solitary death and arson. On top of that, it includes things like whether or not a gangster organization (yakuza) used the space, or if a religious cult exists nearby.
there are also some cases where tenants complained of “residual smells” being left behind by decomposing corpses, or tenants who developed insomnia due to the psychological pressure of knowing what occurred in their unit...
But this could be a good thing for some renters. Stigmatized properties are cheaper. Plus the supernatural elements might come in handy for the right person:
It’s a stigmatized property, which means low initial cost! You’ll be living alone, but you’ll never really feel like it. This room is perfect for lonely singles♪ (emphasis added)
there's even an advertising strategy with a, well, friendly ghost:
A friendly ghost, haunted child, or creepy manifestation can keep you company during those lonely nights.
(thanks to Randy McCall)