law: Delhi Rent Control Act, 1958 
  9. Controller to fix standard rent, etc. -
  (1) The Controller shall, on an application
  
  made to him in this behalf, either by the landlord or by the tenant, in the
  
  prescribed manner, fix in respect of any premises-
  ( i )
  
  The standard rent referred to in section 6; or
  (ii) The increase, if
  
  any, referred to in section7.
  (2) In fixing the standard rent of any
  
  premises of the lawful increase thereof, the Controller shall fix an amount
  
  which appears to him to be reasonable having regard to the provisions of
  
  section 6 or section 7 and the circumstances of the case:
  [(Note: Ins. by Act 57 of 1988, sec.6 (w.e.f . 1-12-1988) Provided that in working out the cost of
  
  construction of any premises or the market price of the land comprised in such
  
  premises for the purpose of section 6, or the cost of improvement, addition or
  
  alteration referred to in section 7, the Controller may take the assistance of
  
  any valuer approved by the Central Government in
  
  accordance with such rules as may be prescribed and the assessment shall be
  
  made by such valuer in the manner prescribed.]
  (3) In fixing the standard rent of any
  
  premises part of which has been lawfully sub-let, the Controller may also fix
  
  the standard rent of the part sub-let.
  (4) Where for any reason it is not possible to
  
  determine the standard rent of any premises on the principles set forth under
  
  section 6, the Controller may fix such rent as would be reasonable having
  
  regard to the situation, locality and condition of the premises and the
  
  amenities provided therein and where there are similar or nearly similar
  
  premises in the locality, having regard also to the standard rent payable in
  
  respect of such premises.
  (5) The standard rent shall in all cases be
  
  fixed for a tenancy of twelve months:
  Provided that where any premises are let or
  
  re-let for a period of less than twelve months, the standard rent for such
  
  tenancy shall bear the same proportion to the annual standard rent as the
  
  period of tenancy bears to twelve months.
  (6) In fixing the standard rent of any
  
  premises under this section, the Controller shall fix the standard rent thereof
  
  in an unfurnished state and may also determine an additional charge to be
  
  payable on account of any fittings or furniture supplied by the landlord and it
  
  shall be lawful for the landlord to recover such additional charge from the
  
  tenant.
  (7) In fixing the standard rent of any
  
  premises under this section, the Controller shall specify a date from which the
  
  standard rent so fixed shall be deemed to have effect:
  Provided that in no case the date so specified
  
  shall be earlier than one year prior of the date of the filing of the
  
  application for the fixation of the standard rent.