Pagri system is like Tenancy Rights.
If due to any reason the old construction is demolished (the reason should be natural calamity, fire etc.); tenancy rights goes off.
Because tenancy rights are on the basis of present construction.
When there is no property then tenancy rights are also over.
If it is not done; mutual understanding is a must for taking possession from the tenant as suggested by Sh. Raj Kumar Makkad.