It turned out that the entrance was not near the security kiosk, nor on any of the four sides of the Capitol building itself. The former grand entrance was swathed in protective sheets while they are doing repairs from the recent earthquake. There were signs at the apparent (yet sealed) entrances that the entrance was on Bank Street. This was not much help to us, as out of towners equidistant from all the surrounding streets. Would an arrow have killed them?
Anyway, here is Karen heading toward the new, improved, underground entrance off of Bank Street. Facing the U.S. Court of Appeals. That would also have been a good clue.