I dunno, the roundhouse was one greasy place. Hard to play around in when I was a kid without getting huge grease stains all over us. I'm sure it's a remediation nightmare. The car shop is fine.
On Dec 4th, a Community Engagement will be held inside the Car shop and those that want to see how rotting parts of the roundhouse are, can see first hand. I would imagine that an event like this that includes food and drink, it should be fairly clean and structurally sound. The other building that just had a movie shoot inside also seemed clean from my limited view.
Remediation on the other hand, could be interesting.