Setup

1. Unzip the download to a permanent folder (keep textures/ and hdri/ next to the .blend).
2. Edit > Preferences > File Paths > Asset Libraries > + and pick that folder.
3. Open the Asset Browser, go to the Building Generator catalogs and drag a building into your scene (Import Method: Append (Reuse Data) recommended).
4. Select the building and change it in the BuildingGenerator modifier. To start from scratch, add the BG_BuildingGenerator node group to any object as a Geometry Nodes modifier.

Main parameters

• Layout: seed, random layout, bay width, floor height, width / depth / floors. Wings: two extra blocks for L, T and U plans.
• Roof: flat / gable / hip, pitch, overhang, parapet, false front, dormers, chimney, gutters, rooftop units, masts.
• Materials: wall style plus 13 material slots; drag any library material onto a slot. Weathering goes from kept-up to abandoned, Imperfections shifts and drops planks and leans posts.
• Facade: weights for doors, shopfronts, windows, ribbon windows, warehouse doors; boarded / plywood / broken window chances.
• Extras: awnings, porches, porch deck, sign with 3D text, balcony and stairs, window AC units, meters, lamps.
• Surroundings: base slab, utility poles and power lines, yard props, dumpster, hydrant, vehicle, weeds, Realize (turns everything into plain geometry for export).

Night renders

Switch the world to BG_World_Night, enable the BG_Moon light and disable BG_Sun, then raise Lit Windows, Open Doors and turn on Lamps On. Window, porch, door and street lights are real light instances that come with the building.