All notices required to be given by either party to the other shall be in writing. All such notices shall be deemed to have been given upon delivery in person, or upon depositing in the United States mail, by certified mail, return receipt requested, postage prepaid, or by delivery by telefax, facsimile or telegraph, or by Federal Express or other nationally recognized overnight delivery service, addressed to the parties at the addresses shown in the summary pages at the front of this Lease or to such other address which either party may hereafter designate in writing by notice given in a like manner.