Key:addr:flats
 addr:flats
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Range of unit numbers of flats behind an entrance door of a building. 
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| Group: Addresses |
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| Status: in use |
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| Wikidata |
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Use addr:flats=* for marking range of numbers of flats behind a door, for example, addr:flats=1-20. If there is gap in numeration, mark numbers and intervals with semicolon: addr:flats=3-7;10;14;16-18.
If there is only one flat, the tag addr:unit=* is normally used instead.
A leading semicolon can be used when a flat number is implicit. For example a house at '10 Some Street' converted into 3 flats with postal addresses of '10 Some Street', 'Flat 1, 10 Some Street' and 'Flat 2, 10 Some Street' can be tagged addr:flats=;1-2 and addr:housenumber=10.
Rendering
Example of addr:flats rendered on osm.org:
Similar tags
addr:flat=* is used 141 times as of 2019-12-13, and is not documented.
This seems to be mostly used on businesses, and could perhaps be replaced with addr:flats=* or addr:unit=*.
See also
- building:flats=* to specify the total quantity of flats (apartments) in a building.
- addr:unit=* for the address of a single unit, including flats, offices etc.