This project explores the application of 3D prefabrication (prefab) methods to address urban densification challenges. The research is anchored in the analysis of corner buildings from 1900 to 1913, which were constructed in complex urban contexts using traditional methods. These buildings provide valuable insights into design flexibility and sustainability, free from the constraints of modern industrial techniques. The study investigates how 3D prefab can replicate and enhance these qualities to create adaptable, high-quality urban spaces. The initial focus was on identifying and overcoming the bottlenecks associated with prefab construction, particularly in corner buildings, which are crucial for urban layouts. Through extensive research and iterative design processes, various prefab methods were evaluated, including 1D, 2D, and 3D approaches. The findings highlight that 3D prefab offers significant advantages in speed, quality, and integration of building systems compared to its counterparts. This method allows for greater design flexibility and spatial efficiency, essential for modern urban environments. A case study involving the Esch neighborhood in Rotterdam demonstrates the practical application of these findings. By integrating 3D prefab modules, the project aims to enhance urban density while maintaining aesthetic and functional integrity. The design leverages the strengths of 3D prefab to create dynamic and sustainable urban corners that contribute to the overall urban network. This research underscores the potential of 3D prefab as a transformative approach for urban densification, offering a balance between rapid construction, high quality, and architectural flexibility. The project sets a precedent for future developments, emphasizing the need for innovative solutions in contemporary urban planning.