While Charlie was showering Saturday morning he noticed a large bubble of water forming underneath the paint on the ceiling. We first called the association to make sure that any overhead water pipes belonged to our upstairs neighbor, and then got in touch with the neighbor's landlord. By late afternoon we had a plumber over tearing apart our ceiling.
I'm cheating a little here by adding an extra photo. This one was taken three days later. Currently there are two large heating fans drying out the wood and hopefully in the next day or two they will be able to begin putting everything back together.