It's called a four storey apartment.
"Story" typically refers to a narrative or a level of a building, while "storey" is mainly used in British English to refer to a level of a building. For example, "The library has five stories," or "The apartment building has ten storeys."
A building with four floors (levels) would be a "four-story building." In the UK, this would be spelled "four-storey."
a single storey dwelling such as a Bungalow
The prefix for storey is "multi-" as in "multi-storey building."
Marilyn Sachs wrote the book "The Four Ugly Cats in Apartment 3D." It tells the story of four neglected and mistreated cats who find a loving home in an apartment building.
Donta Storey's birth name is Donta Deshawn Storey.
June Storey's birth name is Storey, Mary June.
Lara Storey's birth name is Lara Beth Storey.
Red Storey's birth name is Roy Alvin Storey.
Scott Storey's birth name is Scott M. Storey.
Stephany Storey's birth name is Stephany Jeanne Storey.
A builder floor apartment is one wherein the builder buys a piece of land, constructs flats in the form of a building, and sells out one or more of them. Principally there is no difference between a builder floor apartment and residential apartment, in case one is opting to buy a flat or apartment.