Is it possible to have multiple textures with merged geometry?

Let’s say I created a 3D city with a lot of BoxGeometry, that I merged into one geometry. Now I have a 3D city mesh with one texture, but I would like to have different textures for each building. But is it even possible with merged geometry?

Have a look into this topic for some ideas: Keyboard of merged geometries
I used a texture atlas to put different glyphs on merged geometries.

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