Korea Apartments
In Korea we have small apartment blocks and large apartment complexes, as well as individual houses. Here is a starting point for how to map them.
Single Apartment Buildings
Examples of these are 'One Room' apartment buildings, or large apartment buildings.
'One Room' (원룸) apartments are similar to 'Studio' apartments since the smallest unit available for rent is one room (generally the living/sleeping/dining room). The toilet/shower is usually separate, and the kitchen may be in an alcove or an area with a sliding door. They are often in small blocks with up to 4 storeys.
Other apartment buildings have larger apartments with many rooms for family living.
How to map:
As a node: create a node and tag with building=apartments. Set the name=* to be the name of the apartment building.
As an area: create an area the same shape as the building and tag with building=apartments. Set the name=* to be the name of the apartment building.
Optionally add the address (addr:street=* addr:housenumber=*) to the node or area.
Apartment Complexes
These are large areas containing several large apartment buildings.
How to map:
Create an area which covers the area of the entire complex.
Tag it with the name=* of the apartment complex and landuse=residential. Optionally add the address (addr:street=* addr:housenumber=*).
Within the area add single nodes or areas for each building outline as described above. Tag as building=apartments and set name=* to the building number.
For roads / streets inside complexes, tag with highway=service since it is for accessing buildings or parking area.