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Because they share a common drain line which is clogged. Gravity and a common drain pipe means the back-up would appear in the downstairs drain, even if it appeared to be cleared in the upstairs drain. Be glad you are not just slightly uphill from the clog. The sink line line needs to be roto rootered from upstairs, through downstairs, through to the common basement drain to clear out the clog.

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Q: In an apartment complex why would sink or dishwasher drainage show up in a downstairs neighbor's sink?
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