Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Town Constructor 2 Free.
Town Constructor 2
This is a 19th Century Town Constructor Pack for creating your own town.
1) 100+ modular parts. Allows you to construct various types of town assets (ex: buildings, road patterns, etc.)
2) High quality street props
3) 9 base architectures
4) Premade buildings for fast city building or individual use
5) Ultra-low resolution buildings for Background use
7) Demo scene