https://blendermarket.com/products/building-generator

Introducing our procedural building library, "Ur! Building Generator." We have developed an innovative way to create buildings that adapt to any shape you need in real-time, and it's incredibly simple and intuitive. With this tool, you can easily move, rotate, scale, extrude, or even add new geometry to modify the appearance of the buildings. Furthermore, the final version will offer up to 20 different architectural styles for you to mix and match in your scene.