law: Delhi Rent Control Act, 1958 
  8. Notice of increase of rent. -
  (1) Where a landlord wishes to increase the
  
  rent of any premises, he shall give the tenant notice of his intention to make
  
  the increase and in so far as such increase is lawful under this Act, it shall
  
  be due and recoverable only in respect of the period of the tenancy after the
  
  expiry of thirty days from the date on which the notice is given.
  (2) Every notice under sub-section (1) shall
  
  be in writing signed by or on behalf of the landlord and given in the manner
  
  provided in section 106 of the Transfer of Property Act, 1982 (4 of 1882).