It doesn't exist in most of Spain/Catalonia either; it's in a few of the largest cities.

Even in small cities in Spain, central areas are high density with three or four storey mix residential buildings.

I chose a random small city in northern Catalonia called Vielha and viewed it on Goggle Maps, there they are. They look different to Eixanple apartment buildings, but they are there in the centre. Population less than 6k.

Chose another, Gironella, a bit further south; population around 4k. One less floor on the multi family apartment buildings in the old centre, and a much higher ratio of SFDs to MFDs in the settlement as a whole, but still there.

How many should I sample to convince you?

If the yardstick moves to "three or four story residential buildings are present" from "every block is 4-story apartments", three story apartments/multi-families can be found in many cities around the US as well.

They’re multi family apartment buildings. Rather like those in the Eichample, but with a different exterior style, and of course without the famous block chamfer.