300 (a) that the tenant is in arrears of rent for more than three months and has ,failed to pay the same to the landlord within one month of the service upon him of a notice of demand; (b) the at the tenant has wilfully caused or permitted to be caused substantial damage to the accommodation; (c) that the tenant has, without the permission in writing of the landlord, made or permitted to be made any such construction as, in the opinion the court, has materially altered the accommodation or is likely substantially to diminish its value; (d) that the tenant has created a nuisance or has done any act which is inconsistent with the purpose for which he was admitted to the tenancy of the accommodation, or which is likely to affect adversely and substantially the landlord 's interest therein; (e) that the tenant has on or after the 1st day of October, 1946, sub let the whole or any portion of the accommodation without the permission of the landlord; (f) that the tenant has renounced his character as such or denied the title of the landlord and the latter has not waived his right or condoned the conduct of the tenant; (g) that the tenant was allowed to occupy the accommodation as a part of his contract of employment under the landlord and his employment has been determined.