I will continue to work on this. This may be something within your own system.
I have your building you sent in a library of my own and into another active scenery. I also have your scenery installed.
So- I do have your textures in two places and still no problem as yet. I will try a third spot and see.
What you are seeing is identical to the original suggestion......
You tagged the bmp as N. so FSX looks for the _LM There is none so FSX ignores everything which is N at night. This is why you see no walls, etc.
HOWEVER..... others see everything fine. so- you do have the _LM. I see it in the texture folder. The problem is that YOUR system does not recognize the existance of the _LM!!!! This is odd!
Question-
While making this building, is there any part say.... roof parts or the like that you did any rotation on?
If so- remember that ANYTIME you rotate something is is always wise to do this....
1.parts
2. click on 'center axis to part'
3. click on 'reset axis rotation' (NOT PART ROTATION)
it looks like all is well concerning this but I'm just trying different things right now.
BTW- Extremely nice building, also airport is well done. Ever done photoreal?
Bob