Is it the responsibility of the developer or the upstairs or the property to leak the sanitary towel toilet pipeline?

It depends on how long you stay. If you stay for more than two years, neither the developer nor the property is responsible. They are only responsible for the house within two years. This leaves the responsibility at home and upstairs. This situation depends on which plate has problems. If there is something wrong with your own section, it is actually a problem upstairs, but it will not be taken care of upstairs, because it will not affect the use and residence.