My model seemed to have exported decently - except for the Zoom 5 views - I have taken two screenshots in the game to show the issue:
The first is the Zoom 5 view of the building - which looks real messed up - I am not sure how to describe it other than like the model was cut up and pasted in a wierd way:
Image 1:
https://imgur.com/6NYEWwy
And here's a more normal view - I think Zoom 3 or 4:
https://imgur.com/sIaRiQi
Both were night views - I think the model has the same issue showing during the day too...