It’s a standardized 3D object library (65 props) made available on sketchfab:
https://sketchfab.com/3d-models/uv-modular2-sketchfab-e0e1b13de8564b719a0c13f926a3ac0c
It allows you to construct different types of buildings.
The pack includes:
65 3D assets + 1 construction example
6 textures:
1 checker for the ground
5 textures (basecolor – emissive – metalness – roughness – normalmap) for all objects.