20A. (1) A review of the rent under the tenancy of a dwelling referred to in section 3(4) shall be carried out in accordance with the tenancy agreement relating to the tenancy of the dwelling.

(2) Where a tenancy agreement referred to in subsection (1) does not include provision for a review of the rent of a dwelling referred to in section 3(4) , subject to subsection (3) , either party may require a review of the rent under the tenancy to be carried out for the purpose of setting the rent.

(3) A review referred to in subsection (2) shall not be carried out more than once in any 12 month period. ]