Any notice, consent or other instrument required or permitted to be given under this Lease shall be in writing and shall be delivered in person, or sent by certified mail, return receipt requested, postage prepaid, or by Federal Express or similar overnight courier service, addressed (a) if to Landlord, at the address set forth in the introductory paragraph of this Lease; and (b) if to Tenant, at the Premises. Any such notice or other instruments shall be deemed to have been given and received on the day upon which personal delivery is made or. If mailed, then forty-eight (48) hours following the date of mailing. Either party may give notice to the other of any change of address and after the giving of such notice, the address therein specified is deemed to be the address of such party for the giving of notices. If postal service is interrupted or substantially delayed, all notices or other instruments shall be delivered in person, or by Federal Express, or similar overnight courier service.