“Where a tenancy is held by a member of a group, occupation by another member of the group, and the carrying on of a business by another member of the group, shall be treated for the purposes of section 23 of the Act as equivalent to occupation or the carrying on of a business by the member of the group holding the tenancy; and in relation to a tenancy to which this Part of this Act applies by virtue of the foregoing provisions of this subsection - … (c) an assignment of the tenancy from one member of the group to another shall not be treated as a change in the person of the tenant.”