Tenant Bathroom Ceiling Caved in Last Night

[James Nix]

Hey Everyone, 

I just received a text from my tenant letting me know her bathroom ceiling caved in last night. So her unit is under an exact replica of her unit above her (Duplex). So, what you see is the part that's caved in is the ceiling directly below the toilet of the tenant upstairs. 

I already sent the video (You see screenshots of a video) to my plumbers and handyman but just wanted to be Pro-Active and put it in the forums for any thoughts of what this could be so I can kind of get an idea of what this could be and the fix.

If possible, could you please list your opinions on what could have cause this also?

Thank you in advance for all replies if I don't 

[Nathan Gesner]

Quote from @James Nix:

It's obviously a leak and the most likely culprit is the toilet. The wax ring could be shot, allowing water (and possibly sewage) to leak out around the ring and soak into the floor. It could be the water supply line dripping on to the floor. Or it could be water from another source like the sink or shower, but that's less likely because it would have to travel to that spot and then run through.

I'm sure your plumber will have no problem identifying the source and fixing it.