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This is a paid asset, but now you can download Modular sci-fi Residential sector B 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
Modular sci-fi Residential sector B v1.0
High-quality Modular models of the Sci-Fi Residential sector B
Large number of blocks.
51 types environment blocks with individual PBR materials.
Textures resolution 2048×2048.
That will get a huge number of variations of the environments.