日本由于土地面積狹小而人口密度高，城市空間密度也很高。因此，在城市更新方面，通過打造立體城市，將所需的城市功能立體疊加，加以高效動線進(jìn)行串聯(lián)的解決辦法最為合理有效，這也是日建設(shè)計(jì)相當(dāng)擅長的規(guī)劃設(shè)計(jì)領(lǐng)域。以帶動繁華和人氣的商業(yè)為中心，配備辦公、酒店、住宅、文化、交通樞紐等多種功能。為了將多種功能合理有效地進(jìn)行配置，需要進(jìn)行合理的動線規(guī)劃對立體空隙空間加以巧妙利用，比如澀谷的城市核概念。另外，在立體城市中通過對綠化和公共空間等便利性設(shè)施進(jìn)行立體化合理配置，實(shí)現(xiàn)為在高密度環(huán)境中工作、生活的人們以及到訪者提供舒適的環(huán)境。

Due to the narrow land area and high population density, the urban spatial density in Japan is very high. Therefore, in the aspect of urban renewal, the most reasonable and effective solution is to build three-dimensional city, superimpose the required urban functions and connect them in series with high-efficiency traffic flow, which is also the planning and design field that Nikkei Sekkei is quite good at. With the business as the center, which can drive prosperity and popularity, it also has many functions such as o☆ce, hotel, residence, culture, transportation hub and so on. In order to configure various functions reasonably and effectively, it is necessary to make smart use of the three-dimensional space with rational tra☆c flow planning, such as the city core concept of Shibuya.In addition, through the three-dimensional and rational allocation of convenient facilities such as greening and public space in a three-dimensional city, it can provide a comfortable environment for people working and living in high-density environment and visitors.