I think Season 3 could possibly get away with taking place in an entire town - not just one building. The town could be a place like Salem with a history of witches. I think another good option would be a chilly boarding school, a brother and sister with a dark history could transfer there, only to realize the culture of the rich, elite, old fashioned society of the school holds more secrets than they do. The haunted school is full of corruption, cover ups, and horror.
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