My question relates specifically to multi-storey residential buildings with several flats on each floor. Not necessarily high-rises or a "block of flats". An example would be the following one I found on Google Maps in Glasgow:
As you can see in the picture there are several doors that are each designated a different address - 19 Crathie Dr, 21 Crathie Dr, 23 Crathie Dr, etc. My question is: how would you refer to each of these? Is 19 Crathie Dr considered one building, and 21 Crathie Dr a different building? Or if everything is considered one whole building what do you call these separate sections?