This data represents LiDAR-derived 2-D buildings for Milwaukee County, Wisconsin in 2020. [Structure polygons representing 2D building footprints across Milwaukee County. These are the structure subtype polygons in the structure-related planimetric data. In 2021, the planimetric structure polygons were extensively updated by the Milwaukee County Land Information Office (MCLIO). This update cycle, SEWRPC classified April 2020 lidar data from Ayres and produced 2D building footprints. MCLIO staff compared this 2D building dataset against the existing planimetric structure data last updated with 2018 imagery and identified and edited structure polygons that were new, demolished, and changed.]