Lease in perpetuity

Querist :
Anonymous
(Querist) 11 August 2011
This query is : Open
Please go through the below provisions of a lease deed:
1.DURATION AND RENEWAL
Upon expiry of the Term of Lease, the term of lease may further be renewed by mutual consent of the parties.
1.1 That this lease shall, unless further renewed, come to an end on September 19, 2017 and the lessee shall hand over physical vacant possession of the schedule premises to the lessors.
2.TERMINATION OF LEASE
2.1Unless otherwise terminated as provided herein, this Deed shall be effective from the date of execution hereof and any renewed term thereof and continue in force for the term set forth in Clauses 1 and such renewed term.
On the basis of the above two clauses, the authority concerned has treated the lease as a lease in perpetuity.
What would be the objection against such interpretation of the above clauses?
Please reply with the help of case laws.