This is a paid asset, but now you can download Modular Stylized Colonial Town 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 Stylized Colonial Town v1.0
Inspired by Bioshock architecture and aesthetics of the witness game, We made a modular town with PBR high-resolution textures to get that AAA feeling for your games.Now you can build highly detailed colonial town alleys and streets with modular buildings and props in your game.
Buildings are modular so its advised to use optimization tools to reduce draw calls.
Buildings are not optimized for mobile
The current scene with no optimizations runs 60fps on 970GTX in unity editor at 3440×1440 resolution.