Researchers of SUSCOM Lab. including Prof. Taehoon Hong have visited Urban Renaissance Agency (UR) headquarters, Urbanics Japan and the Tokyo Institute of Technology for urban housing in Yokohama (Japan) on Jul. 5-6th, 2011. On the first day, green policy and maintenance management process in multi-family housing were introduced in UR headquarters and discussions on green roof and green wall were made through interviews with the representative in Urbanics Japan. On the second day, various construction techniques for the carbon dioxide emissions reduction were discussed in Tokyo Institute of Technology for urban housing.