1. If you win a duel at a building, the rules say you get to perform the building's action. Do you move your character to the building (freeing up the space you were at), or do you leave it where it was?
2. If you move your standee to the building after winning a duel, if someone else chooses to duel for that building, do they pick which defender?
3. If you lose a duel and go to jail, on your next turn the rules say you get to visit any building even if it's occupied. Do you move your character in that case?
We move our standee to the building in order to duel (not afterwards) - how can you have a fight if you're not in the same location?
So we'd move to a building, have a duel if necessary, and if unsuccessful at a duel then move to jail.