I’m not 100% sure on this but I believe that model is owned by Bentley Systems. It’s served by ion as a sample tileset, so I don’t think it’s available to be downloaded and used offline.
If you just need something to test with you can just use that ion link there. If you have your own BIM datasets, you can upload them to your ion account (cesium.com/ion) and be able to serve them that way.
I'm not 100% sure on this but I believe that model is owned by Bentley Systems. It's served by ion as a sample tileset, so I don't think it's available to be downloaded and used offline.
If you just need something to test with you can just use that ion link there. If you have your own BIM datasets, you can upload them to your ion account (cesium.com/ion) and be able to serve them that way.