All notices required by, or provided in connection with, this Sublease shall be sent by certified mail, return receipt requested, or by nationally recognized overnight delivery service, or by personal delivery, to the Sublessor at its address in the preamble of this Sublease, to the attention of “Office Managing Partner,” with a copy to Sublessor at Hunton & Williams LLP, 951 East Byrd Street, Richmond, Virginia 23219, Att’n: Chief Administrative Officer, and to Sublessee at 2200 Pennsylvania Avenue, N.W., Washington, DC 20037, Attn: Chief Executive Officer, with a copy to Sublessee at the Sublease Premises, Attn: Legal Department. Either party may change its notice address by providing notice of such new addresses by notice to the other party as provided herein. Any notice sent in the manner provided herein shall be deemed to be received three days after posting certified mail with the U.S. Postal Service, or the business day after delivery of such notice to such overnight delivery service, or upon personal delivery. Refusal to accept delivery shall constitute receipt of any such notice.