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Sorry to hear that this happened!
Kitchen sink backups caused from a block in the stack are generally going to be condo corporation responsibility. I think the exception is if the condo has had its kitchen stacks cleaned in the last 5-10 years then you could argue the unit below caused the backup.
Even when the unit has insurance, it’s often a tossup if the adjuster will pay for the loss. It really depends on if the condo corporation can prove they have done regular maintenance to the kitchen stacks, and there is a plumbers report that says the unit caused the blockage in the stack.
