How to remodel this mesh as NURBS surface?


I tried to contour the forms and then used a combination of sweep and loft on the rebuilt contour curves to try and recreate the forms. I also tried Drape, without much success. However, I am having trouble figuring out how exactly to remodel it so that it can be a single surface instead of a complex polysurface.

The original geometry was created from massing boxes, which I brought into Maya and connected together by bridging edges, then smoothed the mesh.

My end goal is to create something that is super simple so that I can import it into Revit and create walls from faces.

Here is the file with my attempts:
massing_question_23-03-25.3dm (11.4 MB)

Hi Andrea -

This cannot be a single surface.

Apart from that, why is this in the Grasshopper category?
-wim