law: 57. Service regulations of Commissioner.
  (1) If the Commissioner is an officer in the service of the Government, the Corporation shall make such contribution towards his leave allowances, pension and provident fund as may be required by the conditions of his service under the Government, to be paid by him or for him, as the case may be.
  (2) If the Commissioner is not an officer in the service of the Government, his leave and leave allowances, his superannuation or retirement, his gratuity or pension and the proportions of his pensionary or provident fund contribution payable respectively from his salary and from the Municipal Fund shall be governed by rules:
  Provided that
  (a) the amount of any such leave and leave allowances, gratuity or pension shall in no case, without the special sanction of the Central Government, exceed what would be admissible in the case of Government servants of similar standing and status; and
  (b) the conditions under which such allowances, gratuity or pension are granted or any leave, superannuation or retirement is sanctioned shall not without similar sanction be more favourable than those for the time being prescribed for such Government servants.