Architecture is architecture.
A style is often exactly a repetition.
That’s why most developers make modular assets for buildings.
You can totally achieve individual feel like that of a real city with modular pieces being merged in different ways to produce a whole in engine - or not in engine if you want more control…
To give you an example I have a wall made of separate bricks and a “simulate all” bluetility button.
I hit the bluetitlity button, run the editor in simulate mode, toss a ball into the wall to have it crash to bits.
Save the positions. Stop the editor. Delete excess blocks. And actor merge.
Done. A completely unique broken wall in maybe 20seconds.
Obviously, not all walls are made of bricks and partially destroyed…
But you can do similar stuff with modular parts down to the individual components so long as you also adjust and cleanup the model…