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 (b)that the tenant without obtaining the consent of the landlord in writing has, after the commencement of this Act, (i)sub let, assigned or otherwise parted with the possession of the whole or any part of the premises; or 550 (ii) used the premises for a purpose other than that for which they were let; or, (c) that the tenant without obtaining the consent of the landlord has before the commencement of this Act, (i)sub let, assigned or otherwise parted with the possession of, the whole or any part of the premises;, or (ii)used the premises for a purpose other than that for which they were let; or (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 respondent constructed the building known as the Hotel Imperial, New Delhi, on land leased to him by the Secretary of State for India in Council under a perpetual lease deed dated July 9, 1937.