This is a paid asset, but now you can download Altostratus Modular Flying City Vol 1 Free.
Detail this asset from Unity Store: Original Link
Altostratus Modular Flying City Vol 1 v1.0
“If possible, please buy the package to support the developer”
The package contains a modular set of 13 lowpoly steampunk flying city elements + different props as airships, towers, mills and other.
They are designed mainly to use in mobile games, strategy games and as distant objects.
Every prefab has an FBX model + single material unwrap.
The city material have 2048×2048 maps (you can resize these).
Contact us for any question or ask for upgrades.