Old Newspaper
They even found an old newspaper buried underneath everything! Unfortunately, they couldn't tell what year it was from because it had been ripped up, but the imagery is reminiscent of the 1920s.
The basement was even bigger than they had imagined! It had tons of different rooms and hallways to explore. That definitely wasn't in the lease!
Blueprints
They even found an old and tarnished blueprint. Even though they tried to inspect it, they couldn't figure out what it could be a blueprint for. It had old paint and rust on it, which made it even harder to scope out.