Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 111, § 127K

Any provision of a lease or other rental agreement relating to real property whereby a lessee, tenant or occupant enters into a covenant, agreement or contract, by the use of any words whatsoever, the effect of which is to waive the benefits of any provision of section one hundred and twenty-seven C to one hundred and twenty-seven I, inclusive, shall be deemed to be against public policy and void.