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It definitely works.
It is possible to leak down the sewer pipe to several floors, my family has had a heating leak on the sixth floor, the fifth floor is fine, and the fourth floor has suffered.
Of course, it is his responsibility to be in his own house, there is a property that can be repaired by the property, and if there is no property management, he can only pay for the repair, but as a neighbor, I suggest that you do not use the kitchen drain first while he is looking for someone to repair.
No, if combined into one pipe, the kitchen smells bad.
It mainly requires labor costs and pipeline material costs. According to the calculation of 200 workers a day, you estimate that it will take 7 days, 3 workers per day, 200 * 7 * 3 = 4200, plus the cost of materials and some unforeseen costs, the cost is about 7000 to 8000.
Tell the property to help, dredge the pipes, and the cost of seven floors will be apportioned with the same unit.