I had a similar situation in my building. This could be from the tenant showering and letting water hit the floor (recaulking EVERYWHERE is a good idea anyways). It could also be from the faucet plate. Sometimes a tenant may take a bath and put their feet where they shouldn't allowing water to get behind something they think is sealed. Another possibility is that the water is coming from another unit. Water travels. All you need is a tiny slope and some long straight beams and water can go from one end of the building to the other. The only way to tell is to rip out the ceiling and trace the water stains back on the wood. I had a moronic tenant stop up the kitchen sink to do dishes, go into the livingroom to watch tv, and forgot the water was going. I had to bang on the door to let her know that I had water pouring out of my ceiling in 3 rooms!
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