Something to note: the courthouse isn't just courtrooms, there are actually law firms with offices inside the building itself, and a couple provincial ministries and several victim support services organizations are in there. I'm sure that's the case with the others.
Here are Thunder Bay's previous Superior Court, now a hotel:
https://www.courthousehotel.ca/
Provincial court of law: (This building is empty and may be demolished for new development)
http://www.courthouses.co/canada-cou...o/thunder-bay/
Provincial attorney's office:
And the municipally administered offenses court:
All four of these offices are now in the new building, which is why its so big.