the dwelling-house has been leased to the landlord with vacant possession for use as temporary housing accommodation;

the terms on which it has been leased include provision for the lessor to obtain vacant possession from the landlord on the expiry of a specified period or when required by the lessor;

the lessor is not a body which is capable of granting secure tenancies; and

the landlord has no interest in the dwelling-house other than under the lease in question or as mortgagee.