However, nowadays every tall building is made earthquake resistant. Yet no one can avert a terrible natural disaster.
If the building collapses due to an earthquake, then there will be no right on the flat. When the building collapses, the right of the flat ends. Yes, you will get the proportional right of the land on which the flat is built.
If that building is insured and the insurance premium is paid, then the insurance company will build the building again on that land and you will get flat. In this case, the building insurance company will make the same as the building was built. The bigger the flat in which you belonged, the bigger the flat you will get.
The builder assumes no responsibility unless it is proved by law that the builder was responsible for the same.