IFC to LOD 0,1,2 Citygml BoundingBoxextractor

I have IFC file exported from Revit with All the detail as required for lod 0 to lod 4 citygml, i want to extract lod 0 to lod 2 from IFC using bounding box, I can do that via IFC spaces, but thats not good for me, i have bounding box detail in my IFC as you can check in screen shot. What is the best method of Automatic bounding box extractor from IFC .