Classes are held in the function room of the Metropolitan Building, which is located on the block between Nassau St. and Oak St., right next to Tufts Medical Center, on the edge of Chinatown.
For the Sunday class, go in the entrance on Oak St. There’s a courtyard with a gate leading to the entrance. Ring the doorbell for the concierge to let you in and turn immediately to your right, going through a pair of glass doors. The hallway beyond leads to the classroom.
On Tuesdays, go in through either of the entrances at 1 Nassau St. (both lead to the same concierge desk). Dial 200 on the intercom for the concierge, who will ring you in, and go past the reception desk, through the door behind it, and walk back to the end of the hall. Turn left just before you reach the back entrance, go through the glass doors, and down the hall to the function room.