Cesium OSM Buildings is a 3D Tileset derived from OpenStreetMap covering the entire world, available on Cesium ion. Read more about it here: https://cesium.com/content/cesium-osm-buildings/.
We regularly update Cesium OSM Buildings. This topic is a changelog so you can keep track of these changes. Subscribe to this topic to get notified for these updates by changing your notification setting to Watching at the bottom of this thread: