If it's "concealed" it shouldn't make any difference what the "law" says. I've carried into banks, hospitals, DMV offices, etc., dozens of times and no one even knew. If there's a metal detector at the door it might be wise to change your mind about going in but otherwise....
OTOH, I once carried my knife into a Social Security office and was asked to go back and leave it in my car. It too was concealed but the guard knew about it because there was a "concealed" metal detector in the entrance.