Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Modern Building Pack Vol 1 Free.
Modern Building Pack Vol 1 v1.0
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11 Unique Low Poly Modern Buildings
Unity 5 Ready and Mobile Friendly
Modern Building Pack Vol 2
Rooftop Objects Pack
– Everything in 1 Material for optimized rendering
– 2048×2048 Diffuse(Specular/Reflective on Alpha) and 2048×2048 Bumpmap
– Separate Specular/Smoothness texture for Unity 5 Standard Shader (read instructions)
– Super Low-Poly Collision Mesh
– Certain buildings have secondary detail mesh that can be hidden when viewing from a distance
– Average of 1000 polys per building
Email me for questions / support