I probably missed something, but the ground floor ceiling doesn't match the color of the interior walls, unlike how it appears in the screenshots.
I just checked both the blender file and the unity package and it seems alright.
What setup do you have?
Lol, I am sorry, I forgot to add a light, so the color of the ceiling got darker. I use Godot, and everything seems alright. Great assets btw!
Thank you!