Can't select imported model

I've imported a 3D model of a land mass.  It is pretty big in physical size and I can see it if I look up in the sky.  The model was built in Revit and the base of the model is about 4000 feet above the ground plane and extends up to around 5000 feet.  When it was imported, Sansar didn't recognize the material and just applied a material to the object.  I can't select it to move down to the level i want to work on.  



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