Because the bathrooms in the building lock from the inside, they create a safety hazard if left perpetually unlocked. For this reason, the bathrooms must be kept locked when not in use.
Keys to open the bathroom are hanging near the top of the column in the main space.
The bathrooms are located on the West side of the basement floor, around the corner from the central stair case and past the elevator. Ask a current member if you need help finding it!