Xiao Ping Song1,2, Daniel Richards3, Peter Edwards3, Puay Yok Tan2. 1. ETH Zurich, Future Cities Laboratory, Singapore-ETH Centre, 138602, Singapore. xp.song@u.nus.edu. 2. Department of Architecture, National University of Singapore, 117566, Singapore. 3. ETH Zurich, Future Cities Laboratory, Singapore-ETH Centre, 138602, Singapore.