How to edit a shape made in Blender in a second 3d modeling program

This is the shape we had created in Blender, but the shape itself is not a building unless we make it into a building. Determining scale, materials & structure

We wanted to keep working on developing our idea as we believed that we could create something more interesting responding to what our abilities in Blender are.

We wanted to keep the smooth angled shape that connected building and site

We experienced that with bringing it in to another modeling program the structure of the shape changed. You could still recognize the form originally generated in Blender, but it had changed drastically.