No act or thing done by Owner or Owner ’ s agents during the Demised Term shall constitute a valid acceptance of a surrender of the Demised Premises or any remaining portion of the Demised Term except a written instrument accepting such surrender, executed by Owner.  No employee of Owner or of Owner ’ s agents shall have any authority to accept the keys of the Demised Premises prior to the termination of this Lease and the Demised Term, and the delivery of such keys to any such employee shall not operate as a termination of this Lease or a surrender of the Demised Premises; however, if Tenant desires to have Owner sublet the Demised Premises for Tenant ’ s account, Owner or Owner ’ s agents are authorized to receive said keys for such purposes without releasing Tenant from any of its obligations under this Lease, and Tenant hereby relieves Owner of any liability for loss of, or damage to, any of Tenant ’ s property or other effects in connection with such subletting.  The failure by Owner or Tenant to seek redress for breach or violation of, or to insist upon the strict performance of, any term, covenant or condition of this Lease on the other party ’ s part to be observed or performed, shall not prevent a subsequent act or omission which would have originally constituted a breach or violation of any such term, covenant or condition from having all the force and effect of an original breach or violation.  The receipt by Owner or payment by Tenant of rent with knowledge of the breach or violation by the other party of any term, covenant or condition of this Lease on such party ’ s part to be observed or performed shall not be deemed a waiver of such breach or violation.  Owner ’ s failure to enforce any Building Rule against Tenant or against any other tenant or occupant of the Building shall not be deemed a waiver of any such Building Rule.  No provision of this Lease shall be deemed to have been waived by Owner unless such waiver shall be set forth in a written instrument executed by Owner.  No payment by Tenant or receipt by Owner of a lesser amount than the aggregate of all Fixed Rent and additional rent then due under this Lease shall be deemed to be other than on account of the first accruing of all such items of Fixed Rent and additional rent then due, no endorsement or statement on any check and no letter accompanying any check or other rent payment in any such lesser amount and no acceptance of any such check or other such payment by Owner shall constitute an accord and satisfaction, and Owner may accept any such check or payment without prejudice to Owner ’ s right to recover the balance of such rent or to pursue any other legal remedy.