This excerpt taken from the QRCP 10-Q filed Aug 9, 2007.
Notice. Any notice required or permitted to be given under this Lease or by law shall be deemed to have been given if it is written and delivered in person or mailed by Registered or Certified mail, postage prepaid, or sent by a nationally recognized overnight delivery service to the party who is to receive such notice at the address specified in Section 1.Y. of this Lease. When so mailed, the notice shall be deemed to have been given two (2) business days after the date it was mailed. When sent by overnight delivery service, the notice shall be deemed to have been given on the next business day after deposit with such overnight delivery service. The address specified in Section 1.Y. of this Lease may be changed from time to time by giving written notice thereof to the other party.