Where exactly is "in" a Federal building?
This might just be a legal question, splitting hairs and out of scope for the forum, but let me pose it.
Say you are a delivery package person. You are to deliver a package to a Federal building. You are carrying concealed. You go up to the desk, before the checkpoint, before the metal scanner, before everything, and tell the clerk that you have a package for Mr. X. He comes down to get it, or you hand it to the clerk who signs for it.
If you are in the building, but not through the checkpoint, are you still required to disarm or not? I know in Oregon I can carry in the airport before the checkpoints. The Port of Portland may not like it, but I think the law is pretty clear on that. The Feds may have different opinions.