They are in the northeast, not the west coast, so I don't think 108 years qualifies as necessarily historic. This issue has nothing to do with historical preservation societies.
The original owners should have disclosed this fact and should be sued. I don't care if there is a law on the book requiring the specific disclosure of whether the house was used as a drug lab -- the house is hazardous to their health and that alone seems like a material fact that should be disclosed during the buying process.