law: Delhi Rent Control Act, 1958 
  6. Standard rent. -
  (1) Subject to the provisions of sub-section
  
  (2), "standard rent", in relation to any premises means-
  (A) In the case of residential premises-
  (1) Where such
  
  premises have been let out at any time before the 2nd day of June, 1944,-
  (a) If the basic rent
  
  of such premises per annum does not exceed six hundred rupees, the basic rent;
  
  or
  (b) If the basic rent
  
  of such premises per annum exceeds six hundred rupees, the basic rent together
  
  with ten per cent, of such basic rent;
  (2) Where such premises have been let out at
  
  any time on or after the 2nd day of June, 1994,-
  (a) In any case where
  
  the rent of such premises has been fixed under the Delhi and  Ajmer - Mewar Rent Control Act,
  
  1947 (19 of 1947), or the Delhi and Ajmer Rent
  
  Control Act, 1952 (37 of 1952),-
  ( i )
  
  If such rent per annum does not exceed twelve hundred rupees, the rent so
  
  fixed; or
  (ii) If such rent per
  
  annum exceeds twelve hundred rupees, rent so fixed together with ten per cent.
  
  of such rent;
  (b) In any other case,
  
  the rent calculated on the basis of [(Note: Subs. by Act 57 of 1988, sec.3, for
  
  "seven and one-half per cent." ( w.e.f . 1-12-1988)
  
  ten per cent]. per annum of the aggregate amount of the [(Note: Subs. by Act 57
  
  of 1988, sec.3, for "reasonable" ( w.e.f .
  
  1-12-1988) actual] cost of construction and the market price of the land
  
  comprised in the premises on the date of the commencement of the construction:
  (Note: Proviso omitted
  
  by Act 57 of 1988, sec.3 ( w.e.f . 1-12-1988) 
  (B) In the case of premises other than
  
  residential premises-
  (1) Where the premises have been let out at
  
  any time before the 2nd day of June, 1944, the basic rent of such premises
  
  together with ten per cent. of such basic rent:
  Provided that where the rent so calculated
  
  exceeds twelve hundred rupees per annum, this clause shall have effect as if
  
  for the words "ten per cent.", the words "fifteen per
  
  cent." had been substituted;
  (2) Where the premises have been let out at
  
  any time on or after the 2nd day of June, 1944,-
  (a) In any case where
  
  the rent of such premises has been fixed under the  Delhi and  Ajmer-Merwara Rent Control Act, 1947 (19 of 1947) or the 
  
   Delhi and  Ajmer Rent Control Act, 1952 (38 of 1952),-
  ( i )
  
  If such rent per annum does not exceed twelve hundred rupees, the rent so
  
  fixed; or
  (ii) If such rent per
  
  annum exceeds twelve hundred rupees, the rent so fixed together with fifteen
  
  per cent. of such rent;
  (b) In any other case,
  
  the rent calculated on the basis of [(Note: Subs. by Act 57 of 1988, sec.3, for
  
  "seven and one-half per cent" ( w.e.f .
  
  1-12-1988) ten per cent] per annum of the aggregate amount of the [(Note: Subs.
  
  by Act 57 of 1988, sec.3, for "reasonable" ( w.e.f .
  
  1-12-1988) actual] cost of construction and the market price of the land
  
  comprised in the premises on the date of the commencement of the construction:
  (Note: Proviso omitted
  
  by Act 57 of 1988, sec.3 ( w.e.f . 1-12-1988) 
  (2) Notwithstanding anything contained in
  
  sub-section (1),-
  (a) In the case of any
  
  premises, whether residential or not, constructed on or after the 2nd day of
  
  June, 1951, but before the 9th day of June, 1955, the annual rent calculated
  
  with reference to the rent at which the premises were let for the month of
  
  March, 1958, or if they were not so let, with reference, to the rent at which
  
  they were last let out, shall be deemed to be standard rent for a period of
  
  seven years from the date of the completion of the construction of such
  
  premises; (Note: The word "and" omitted by Act 57 of 1988, sec.3 (w.e.f . 1-12-1988)
  (b) In the case of any
  
  premises, whether residential or no, constructed on or after the 9th day of June,
  
  1955, including premises constructed after the commencement of this Act [(Note:
  
  Ins. by Act 57 of 1988, sec.3 ( w.e.f . 1-12-1988) but
  
  before the commencement of the Delhi Rent Control (Amendment) Act, 1988], the
  
  annual rent calculated with reference to the rent agreed upon between the
  
  landlord and the tenant when such premises were first let out shall be deemed
  
  to be the standard rent for a period of five years from the date of such
  
  letting out.
  [(c) (Note: Ins. by
  
  Act 57 of 1988, sec.3 ( w.e.f . 1-12-1988) In the case
  
  of any premises, whether residential or not, constructed on or after the
  
  commencement of the Delhi Rent Control (Amendment) Act, 1988 and to which the
  
  provisions of this Act are made applicable by virtue of clauses (d) of section
  
  3, the rent calculated on the basis of ten per cent, per annum of the aggregate
  
  amount of the actual cost of construction of the premises and the market price
  
  of the land comprised in the premises on the date of commencement of the
  
  construction, of the premises shall be deemed to be the standard rent]
  (3) For the purpose of this section,
  
  residential premises include premises let out for the purpose of a public
  
  hospital, an educational institution, a public library, reading room or an
  
  orphanage.