Go to the Talos Plaza District in the Imperial City and go to Dorian's house. Note: If facing the dragon statue, turn left and it is the first house on the left. Go inside the house and speak to him. He will not like you very much. Bribe him, then use a paralyze spell on him. While he is paralyzed, select him. When you see the items menu, select his money and you can take it repeatedly. When done, guards will come after you, but with a weak fine. If you are not happy with the amount taken, go back and do it again. Repeat as desired.