Other than a request made pursuant to Landlord’s HVAC Request Procedure, no notice, demand, statement, designation, request, consent, approval, election or other communication given hereunder (“ Notice ”) shall be binding upon either party unless (a) it is in writing; (b) it is (i) sent by certified or registered mail, postage prepaid, return receipt requested, (ii) delivered by a nationally recognized courier service, or (iii) delivered personally; and (c) it is sent or delivered to the address set forth in Section 1.10 or 1.11 , as applicable, or to such other place (other than a P.O. box) as the recipient may from time to time designate in a Notice to the other party. Any Notice shall be deemed received on the earlier of the date of actual delivery or the date on which delivery is refused, or, if Tenant is the recipient and has vacated its notice address without providing a new notice address, three (3) days after the date the Notice is deposited in the U.S. mail or with a courier service as described above. No provision of this Lease requiring a particular Notice to be in writing shall limit the generality of clause (a) of the first sentence of this Section 25.1 .