You're in a large room looking at a long banquet table. Keep the banquet table to your left and walk down the path between the counters and the banquet table. Once you're at the other end of the banquet table, take a left and walk straight down the path towards the wooden column. Stop at the wooden column, take a right, and you'll find some stairs going down. Take the stairs down. Down the stairs, you'll find a room on the opposite corner that's open. Enter that room. You'll find that it is a bathroom with a toilet that has a wooden lid, and four frames hanging on the wall. You're done.