The surrender, express or implied, of a lease of immovable property does not prejudice an under-lease of the property or any part thereof previously granted by the lessee, on terms and conditions substantially the same (except as regards the amount of rent) as those of the original lease;
but, unless the surrender is made for the purpose of obtaining a new lease, the rent payable by, and the contracts binding on, the under-lessee shall be respectively payable to and enforceable by the lessor.
The forfeiture of a lease determines all such under-leases, except where such forfeiture has been procured by the lessor in fraud of the under-lessees, or relief against the forfeiture is granted under section 114.
Legal Commentary & Landmark Judgments: Section 115
Section 115 regulates the legal effect of surrender and forfeiture on under-leases, providing that an express or implied surrender does not prejudice under-leases previously granted, whereas a valid forfeiture destroys under-leases unless procured by fraud.
If a master tenant colludes with the landlord to surrender the lease to evict you as a lawful sub-tenant, assert Section 115 to claim direct tenancy status under the head landlord.