Surface from multiple surfaces

New to Rhino! I have opened a DXF of a 3D surface created from a Navis Works model then through REVIT. I want to create a surface to use in grasshopper but it appears to be made of of lots of smaller surfaces that overlap. Is there a way of creating one surface that combines all of these surfaces using the average plane to create a smooth surface? TEST 3D surface 2.3dm (308.1 KB)

Hello - I would do this:

1.Get the original mesh if you can.
2. Patch the mesh
3. Trim the outline of the patch to match the perimeter of the mesh.


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