Section 2-A-208. Modification, Rescission and Waiver

(1)  An agreement modifying a lease contract needs no consideration to
  be binding.
    (2) A signed lease agreement that excludes modification or  rescission
  except  by  a signed writing may not be otherwise modified or rescinded,
  but, except as between merchants, such a requirement on a form  supplied
  by a merchant must be separately signed by the other party.
    (3) Although an attempt at modification or rescission does not satisfy
  the requirements of subsection (2), it may operate as a waiver.
    (4)  A party who has made a waiver affecting an executory portion of a
  lease  contract  may  retract  the  waiver  by  reasonable  notification
  received  by the other party that strict performance will be required of
  any term waived, unless the retraction would be  unjust  in  view  of  a
  material change of position in reliance on the waiver.