Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Top-Down Sci-Fi Free.
Top-Down Sci-Fi v1.0
Comprehensive set of modules to build interior scenes in the sci-fi style: corridors, laboratories, warehouses, spaceships. Works in top-down view as well as with other camera angles: first or third person.
Set includes Demo scene and more than 200 prefabs: walls, floors, stairs, lcd panels, generators, etc. The package is designed for mobile devices (one texture – optimized mesh)