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Flags promoting Japan's bid for the 2020 Olympics and Paralympic Games are displayed during a media tour in Tokyo, Japan, on Monday, July 29, 2013. Tokyo, the front-runner city to host the 2020 Olympics, is planning its biggest housing complex in 42 years to lodge athletes, a move that could benefit developers such as Shimizu Corp. and Mitsubishi Estate Co. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images

Flags promoting Japan's bid for the 2020 Olympics and Paralympic Games are displayed during a media tour in Tokyo, Japan, on Monday, July 29, 2013. Tokyo, the front-runner city to host the 2020 Olympics, is planning its biggest housing complex in 42 years to lodge athletes, a move that could benefit developers such as Shimizu Corp. and Mitsubishi Estate Co. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images