A block of flats is a residential building consisting of apartments.
The collective noun is a block of flats.
block
block
Block of flats = apartment building or apartment complex.
205km
The collective nouns are:an undulation of hillsa block of flats
Un immeuble
yes
'un appartement' (masc.) an apartment block, a block of flats: un immeuble
Block of flats in the towns, villas, etc.
Nelson Mandela House
The collective noun for flats is typically referred to as a "block" of flats. This term is commonly used to describe a building or group of apartments that are located together. In some contexts, you might also hear "complex" or "development" when referring to multiple flats within a larger residential area.