4th Workshop and Challenge on Computer Vision in the Built Environment Scan-to-BIM Challenge Held in conjunction with the IEEE Conference on Computer Vision and Pattern Recognition 2024 First Place 2D FLOORPLAN RECONSTRUCTION Longyong Wu, Ziqi Li, Meng Sun, Fan Xue HKU-iLab, Department of Real Estate and Construction, The University of Hong Kong Fuxin Li, on behalf of the Organizing Committee