July 21, 2009. Participants who vote are requested to cut out the ballot and send it before August 10, 2009 (including August 10, as determined by the postmark) to Room 815, Building A, Information Tower, No. 315, Guang'anmen Nei Street, Xuanwu District, Beijing - Statistics Group for the Evaluation of Beijing's Top Ten Contemporary Buildings. Postal code: 100053. Ensure sufficient postage is attached. (Multiple ballots can be placed in one envelope....)