This excerpt taken from the URBN 10-Q filed Jun 9, 2005.
SECTION 25.05 Notices
All notices or other communications given hereunder shall be valid only if in writing and delivered in person or sent by registered or certified mail, postage prepaid, return receipt requested, or sent by nationally operating overnight courier service, addressed as follows:
or to such other person or place as a party may designate by notice as aforesaid. Notice by personal delivery shall be deemed given if delivered to the Leased Premises during the hours of required operation. Notice by registered mail shall be deemed given on the third (3rd) business day following deposit in the mail. Notice by overnight courier service shall be deemed given on the next business day following deposit with such service.