Instead of a straight extrusion of 2m wide flying buttress all the way until the end of the city block, gradually the buttress extension gets thinner until it becomes 200mm wide in 10 steps.
Carving openings functioning as arches can be a way of moving away from the solid walls.
This is the D-O northern extension
8m distance between each of the vertical structure of this extension. Frame gets narrow by 200mm, starting with 2000mm width, ending with 100mm.
