The condition of the dwelling-house or of any of the common parts has deteriorated owing to acts of waste by, or the neglect or default of, the tenant or any person residing in the dwelling-house and, in the case of any act of waste by, or the neglect or default of, a person lodging with the tenant or a sub-tenant of his, the tenant has not taken such steps as he ought reasonably to have taken for the removal of the lodger or sub-tenant.
In this paragraph, “the common parts” means any part of a building comprising the dwelling-house, and any other premises which the tenant is entitled under the terms of the tenancy to use in common with the occupiers of other dwelling-houses let by the landlord.