law: Delhi Rent Control Act, 1958 
  35. Appointment of Controllers and Additional
  
  Controllers .-
  (1) The Central Government may, by
  
  notification in the Official Gazette, appoint as many Controllers as it thinks
  
  fit, and define the local limits within which, or the hotels and lodging houses
  
  in respect of which, each Controller shall exercise the powers conferred, and
  
  perform the duties imposed, on Controllers by or under this Act.
  (2) The Central Government may also, by
  
  notification in the Official Gazette, appoint as many additional Controllers as
  
  it thinks fit and an additional Controller shall perform such of the functions
  
  of the Controller as may, subject to the control of the Central Government, be
  
  assigned to him in writing by the Controller and in the discharge of these
  
  functions, an additional Controller shall have and shall exercise the same
  
  powers and discharge the same duties as the Controller.
  (3) A person not be 
  
  qualified for appointment as a Controller or an additional Controller, unless
  
  he has for at least five years held a judicial office in India or has for at least
  
  seven years been practicing as an advocate or a pleader in India .