All notices, approvals, consents and other communications hereunder shall be in writing, and, except when receipt is required to start the running of a period of time, shall be deemed given when delivered in person or on the fifth day after its mailing by either party by registered or certified United States mail, postage prepaid and return receipt requested, to the other party, at the addresses set forth after their respect name below or at such different addresses as either party shall have theretofore advised the other party in writing in accordance with this Section 7.1 .