What would a fruity smell coming from the basement of an old building indicate?
I spent NYE at our tiny country church, playing games and snacking. As we were packing everything up at 12:30 am, I was standing next to an air vent. There was a weird smell coming from the basement. (The air vents go straight from the basement up – no ducts, really.) I walked over to a different vent, and smelled it there, too. Other people noticed it, too. Over the next half hour, it seemed to get stronger and spread.
This building is 150+ years old and is in sore need of demolition, by the way. Dead animals of many kinds have been found in the basement, so that was the first guess. But we’ve never noticed this weird fruity smell. What could be causing this? Should something be done about it?
This question is in the General Section. Responses must be helpful and on-topic.