—The landlord is a housing association which has as its object, or as one of its objects, the housing of persons who are in a special category by reason of age, infirmity, disability or social circumstances and the tenant (or one of joint tenants), having been granted a tenancy as a person falling into such a special category, has ceased to be in the special category, or for other reasons the accommodation in the house is no longer suitable for his needs, and the accommodation is required for someone who is in a special category.