In this trend report the stress of urbanization in the city of Tokyo is discussed. Urbanization has an impact on the traffic, commute and housing. There are also big environmental impacts of urbanization itself. One solution for the non-environmental effects is to decentralize and enlarge the urban sprawl, but for the amount of impervious area this is not desirable. There are solutions to improve the urban area to counter the environmental impacts, focussing on the impervious area. The solutions discussed in the trend report are permeable pavings, rain gardens and green roofs.