I still think there may some specific associations you have to public bathrooms that could shed additional light. Do you feel they are dirty unsafe places, or are they sanitary usually? Have you ever been somewhere in real life that had very large public bathrooms? It's interesting that it's a large public space, ready to be occupied by people, but no one is there. How do you feel about this absence of people? Is it lonely? Peaceful?

To me, a large empty building seems to express that there is some potential in your life, some potential capacity or way of relating to people, but it hasn't been put into action yet. That's my association. But tell us yours.