The office is located in the old mill building across the river from the Children's Museum. After you cross the bridge veer right instead of continuing around the corner.
You may be able to find a free 2 hour visitor parking space but metered parking is also available on the street. The meters accept coins and credit cards.
Enter 1 Washington Center. (The door in the picture below)
Take the elevator or stairs to the 3rd floor. Follow the signs to the Picker Unit, 3 WEST. Make sure you follow the WEST sign and continue around the corner and go through the glass door of the Picker unit (photo below)The office is in room 309. If you arrive early feel free to make yourself comfortable in the lobby. (If the glass door is locked I will be there momentarily to let you in.)