law: Transfer of Property Act, 1882
  72. Rights of mortgagee, in possession
  A mortgagee may spend such money as is necessary-
  (a) 6[***]
  (b) for the preservation of the mortgaged property from
  
  destruction, forfeiture or sale;
  (c) for supporting the mortgagor's title to the property;
  (d) for making his own title thereto good against the mortgagor;
  
  and
  (e) when the mortgaged property is a renewable lease-hold, for the
  
  renewal of the lease, and may, in the absence of a contract to the contrary,
  
  add such money to the principal money, at the rate of interest payable on the
  
  principal, and, where no such rate is fixed, at the rate of nine percent per
  
  annum: '
  PROVIDED that the expenditure of money by the mortgagee
  
  under clause (b) or clause (c) shall not be deemed to be necessary unless the
  
  mortgagor has been called upon and has failed to take proper and timely steps
  
  to preserve the property or to support the title.
  Where the property is by its nature insurable, the mortgagee may
  
  also, in the absence of a contract to the contrary, insure and keep insured
  
  against loss or damage by fire the whole or any part of such property, and the
  
  premiums paid for any such insurance shall be added to the principal money with
  
  interest at the same rate as is payable on the principal money or, where no
  
  such rate is fixed, at the rate of nine per cent per annum. But the amount of
  
  such insurance shall not exceed the amount specified in this behalf in the
  
  mortgage-deed or (if no such amount is therein specified) two-thirds of the
  
  amount that would be required in case of total destruction to reinstate the
  
  property insured.
  Nothing in this section shall be deemed to authorize the
  
  mortgagee to insure when an insurance of the property is kept up by or on
  
  behalf of the mortgagor to the amounts in which the mortgagee is hereby
  
  authorized to insure.