This is a paid asset, but now you can download Future Slums (Built-In) Free.
Detail this asset from Unity Store: Original Link
Future Slums (Built-In) v1.0
◼ PRODUCT DESCRIPTION ◼
Create the overpopulated metropolises of sci-fi dystopias or the more realistic, overcrowded ghettos and shantytowns of a not-so-distant future for the largest cities in the world today. Inspired by the ungoverned, crime-ridden Kowloon Walled City, this kit’s plethora of vertical buildings, slum mega blocks, favelas, and highly-detailed prop pieces from clothing lines to air conditioners will help you construct slum-ridden scenes with intricate detail and realism!
Modeled by Mihailo Radosevic, and texturing by Mike Golden, with cover art by Sava Zivkovic.
◼ A MESSAGE FROM KITBASH3D ◼
Proceed with creativity! You are about to purchase a 3D asset kit that includes elements to set the scene as you build your world, whether it’s for video games, film, television, design, or art. These completely customizable assets will serve as the building blocks to help you create an original environment.
◼ KEY FEATURES ◼
-15 PBR Materials
-4096×4096 Texture Maps
◼ COMPATIBILITY ◼
– Works in Unity 2019.3.13 and above.
– HDRP/Built-In versions are freely upgradeable to Unity customers.