Notwithstanding anything to the contrary contained in any other law or any contract, no decree or order for the recovery of possession of any premises shall be passed by any court in favour of the landlord against any tenant (including a tenant whose tenancy is terminated) : Provided that nothing in this sub section shall apply to any suit or other proceeding for such recovery of possession if the court is satisfied (k) that the tenant has, whether before or after the commencement of this Act, "caused or permitted to be caused substantial damage to the premises, or notwithstanding previous notice has used or dealt with the premises in a manner contrary to any condition imposed on the landlord by the Government or the Delhi Improvement Trust while giving him a lease of the land on which the premises are situated;" The lease in favour of the landlord by the Government provided that "the lessee will not without the previous consent in writing of the Chief Commissioner of Delhi or such officer or body as the lessor or the Chief Commissioner of Delhi may authorise in this behalf erect or suffer to be erected on any part of the said demised premises any buildings other than and except the buildings erected thereon at the date of these presents.