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continue our conversation.What type of piping to that unit? were any valves shut off?
Where in the building is this unit?
Well you have to give me something to go on. I'm blind here except for what you can tell me. The 2 most likely culprits are a piping issue (galvy or steel piping) or somebody shut off a couple valves. There are no other likely culprit for losing all the water to all the fixtures in a bathroom. There's a slim chance that all the fixtures are clogged with sediment but even that isn't likely unless the water was shut off recently
Ok but since I can't go to your building and inspect the conditions I need you to give me something to go on. You also seem to have ruled out the piping. Are the branches to this bathroom exposed so you're sure it's all copper? Beyond that this cause would be unusual so if you can't provide more info there's not much more I can do from here sitting behind a computer screen.
PVC (unless it collapsed) isn't going to cut of the flow to an entire bathroom. Was the water turned off to that apartment recently? did you try cleaning the aerator on the end of the sink faucet spout?