This study quantitatively analyzes the status of three-dimensional attributes of building data in OpenStreetMap (OSM), a prominent example of Volunteered Geographic Information (VGI), and the characteristics of editing activities across Japan. Recently, demand for 3D city models has increased in various fields including urban planning, disaster prevention, and environmental simulation, but their development incurs substantial costs. OSM provides freely available open data with the capability to record 3D attributes such as building height and number of floors. However, existing research has primarily focused on city-level or 2D data quality assessment (Labetski et al., 2023; Lei et al., 2023). This study constructed a pipeline to extract and analyze building data from OSM, evaluating the spatial coverage of 3D attributes and the continuity and concentration of editing activities across Japan.