669. Sharing with a subtenant.

Where the tenant1 of any premises, consisting of a house or part of a house, has sublet a part, but not the whole, of the premises, no part of the premises is, as against his landlord2 or any superior landlord, to be treated as not being a dwelling house let on or subject to a protected3 or statutory4 tenancy by reason only that:


    (1)     the terms on which any person claiming under the tenant holds any part of the premises include the use of accommodation in common with other persons; or


    (2)     part of the premises is let to