From OpenStreetMap Wiki
|building = garages|
|A block of private garages each with a separate owner|
|Used on these elements|
|Status: In use|
|Tools for this tag|
- For smaller, single-user private garages, see building=garage.
- For public car parking, see amenity=parking.
The tag building=garages is used for buildings which are blocks of private garages, where each garage space has a different owner.