Section 21

to apportion the fair rent of the whole premises as between the tenant and all the subtenants of any part or parts of the whole premises or as between the landlord and all the joint-tenants of any part or parts of the whole premises; and

to determine the fair rent of all or any one or more part or parts of the whole premises sublet to any and every subtenant or held by a joint-tenant thereof.

No application under this section shall be considered by the Tribunal unless the applicant shall have first requested the Rent Officer for the area where the controlled premises is situated to apportion and determine the said fair rent and such Rent Officer for any reason is unable so to do or the fair rent apportioned and determined by him is not accepted by any of the parties.

When any application is made to the Tribunal under this section the landlord, the tenant and all subtenants and all joint-tenants shall be deemed to be interested parties in the proceedings and shall be given an opportunity of being heard and of producing such evidence, oral or documentary, as seems relevant to the Tribunal, and may, if the Tribunal so directs, be joined as parties in the proceedings.

After hearing the applicant and all persons interested in such application, the Tribunal shall thereupon make an order apportioning and determining the fair rent applied for in such application; and such apportionment and determination shall be made in accordance with sections 5 and 6.