law: Delhi Rent Control Act, 1958 
  17. Notice of creation and termination of
  
  sub-tenancy. -
  (1) Whoever, after the commencement of this
  
  Act, any premises are sub-let either in whole or in part by the tenant with the
  
  previous consent in writing of the landlord, the tenant or the sub-tenant to
  
  whom the promises are sub-let may, in the prescribed manner, give notice to the
  
  landlord of the creation of the sub-tenancy within one month of the date of
  
  such sub-letting and notify the termination of such sub-tenancy within one
  
  month of such termination.
  (2) Where, before the commencement of this Act,
  
  any premises have been lawfully sub-let either in whole or in part by the
  
  tenant, the tenant or the sub-tenant to whom the premises have been sub-let
  
  may, in the prescribed manner, give notice to the landlord of the creation of
  
  the sub-tenancy within six months of the commencement of this Act, and notify
  
  the termination of such sub-tenancy within one month of such termination.
  (3) Where in any case mentioned in sub-section 
  
  (2), the landlord contests that the premises were not lawfully sub-let, and an 
  
  application is made to the Controller in this behalf, either by the landlord or 
  
  by the sub-tenant, within two months of the date of the receipt of the notice of 
  
  sub-letting by the landlord or the issue of this notice by the tenant or the 
  
  sub-tenant, as the case may be, the Controller shall decide the dispute