In a fast-expanding city,building is no longer limited to a single building,but also extends to the scale of urban development.Since ancient times,China has had a tradition of Residential & Commercial Mixed-Use.With a conversion of different functions in the same unit,this greatly increases the efficiency of space-use.In modern times,using the Internet,mobile phones,it is possible to convert the vertical stacking of living units,creating more natural space in busy and crowded cities,blending with traditional Hutong neighborhoods as Chinese long-axis paintings reflect the truest life.