Hello,
So sorry to see this.
We've had a look and found an issue with how navigation works on the part of your building with the door.
If you move this to the other side it should work again. I've added red and green outlines to your screenshot. Green being good, Red being bad. 
We'll get this fixed ASAP!
Thanks,
Chizel
When I played my game after the 3.0 update and Sunshine Creek location was added, an entire building in passwater cove says that the exhibits are not able to be reached.
These are all ghost exhibits and they have all left their rooms because no staff can enter the building either despite their being a door and no indication that there's a problem.
Here is a link to my Steam Two Point Musem.zip folder: https://drive.google.com/file/d/1AYwtOG4vFXmCrU7nXTEMVl6Y2iMG5V9A/view?usp=sharing