Above Belfiore's (enter the building and go to the second floor on the right).
Go through the gates on the right, and then around into the carriage house on the right
(photos coming soon!)
Enter the studio from the PARKING LOT IN BACK.
You many also use the 14th street entrance, which is a few doors to the right of the coffee shop entrance. This is great when it's snowy so you don't have to walk around back.