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This is a paid asset, but now you can download Sci Fi Level Construction Pack 1 for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Sci Fi Level Construction Pack 1 v1.2
Asset package for fast and easy creation of sci-Fi levels. All maps are 2048×2048 (Diffuse, Specular, Heightmap, Normal map).
116 prefabs (walls, corners, floors, columns, lights, decorative objects).
Demo level included.
Video
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Unity 2017 compatibility