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EDITED TO CLARIFY
What's the significance of "portion of a building" in "building or portion of a building"?

I've always meant to ask: shouldn't that be meant to mean that if the city has a large building with a courtroom, you could carry in the building except in the courtroom?

The few times I have to deal with city buildings I don't rock the boat and just disarm, but I always wondered what this was supposed to mean.