How do I fix lighting within a building?

So I am stuck on this part. I don’t really want to add in windows to the airport, but this dark spot keeps on popping on. What should I do?

I’ve added some windows, but adding too much will destroy the exterior/interior design of the entire place.

Here’s a picture:

Thank you to anyone who helps!

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Get rid of castshadows, it’ll be on the roofs properties!


Finally, thank you! Now I don’t need to make windows for more light :smiley:

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Put Cast Shawdows to false in proporties.

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