Apologies, I totally missed that! Here's some information I found - Apply Elevation Correction Sometimes the iModel is not displayed at the right elevation in Design Review. Most of the time this happens when the input design file was created with the wrong vertical datum; Ellipsoid instead of Geoid. So when the user turns ON the Cesium terrain, the elevation is incorrect. Another case is when the user has drawn his design at the right location but on a random elevation. To correct the elevation None - Use this option when no correction is required. This is the default option. Geoid Separation - Use this option when the iModel has been created with the wrong vertical datum (Ellipsoid instead of Geoid). Terrain Elevation - Use this option to apply a correction with the Terrain Elevation. You can play with the Model Height option to adjust the elevation with more accuracy. Exaggeration Use this option to exaggerate the elevation of the Cesium terrain. Now, this doesn't really explain why you are getting negative values, but I have a feeling its due to the iModel geocoordinates, which has a way of messing things up! I will recommend creating a Services Request for this - construction.bentley.com/service-request
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