Architecture Engineering and Science

Against the backdrop of accelerated urban stock renewal, the development of high plot ratio land faces a deep contradiction between "quantity" and "quality": rigid constraints on plot ratio lead to physical barriers such as insufficient lighting, chaotic flow lines, and lack of public space, while the demand for quality living places higher demands on spatial openness, ecology, and social inclusiveness. This article focuses on this core game relationship, by analyzing design strategies such as underground space composite utilization, ecological compensation for rooftop gardens, and cross plot three-dimensional corridors, combined with ownership division coordination, full process cost control, and policy tool innovation, to construct a comprehensive improvement mechanism of "physical optimization ownership coordination economic balance", providing replicable design paradigms and decision-making references for improving the quality and efficiency of existing land in high-density urban development scenarios.