There seems to be many ways to do this in the wild, while searching I've seen: * [building=entrance + ref=*][1] more than 20 usages around the world, means flat "D" (can't do a search for that * [addr:flatnumber][2] 50 usages in world, + addr:flatnumber:interpolation=all/even/odd (just used once) But I still think this is a general problem, there exist many places that have only one housenumber or address but include many sub addresses. - Unit numbers - Entrance numbers - Building numbers - Tent location - Parking numbers - Cabin numbers (in hotels) Perhaps something like: addr:subnumber=* title:addr:subnumber=Lot or ref=b-k ref:title=flat/lot/entrance/blabla? [1]: http://www.google.se/search?q=building%3Dentrance+ref+openstreetmap.org+inurl:browse+site:openstreetmap.org [2]: http://taginfo.openstreetmap.de/keys/addr:flatnumber#values

There seems to be many ways to do this in the wild, while searching I've seen: * [building=entrance + ref=*][1] 20 usages around the world, means flat "D" (can't do a search for that * [addr:flatnumber][2] 50 usages in world, + addr:flatnumber:interpolation=all/even/odd (just used once) But I still think this is a general problem, there exist many places that have only one housenumber or address but include many sub addresses. - Unit numbers - Entrance numbers - Building numbers - Tent location - Parking numbers - Cabin numbers (in hotels) Perhaps something like: addr:subnumber=* title:addr:subnumber=Lot or ref=b-k ref:title=flat/lot/entrance/blabla? [1]: http://www.google.se/search?q=building%3Dentrance+ref+openstreetmap.org+inurl:browse+site:openstreetmap.org [2]: http://taginfo.openstreetmap.de/keys/addr:flatnumber#values

I think this is a general problem, there exist many places that have only one housenumber or address but include many sub addresses. - Unit numbers - Entrance numbers - Building numbers - Tent location - Parking numbers - Cabin numbers (in hotels) Perhaps something like: addr:subnumber=* title:addr:subnumber=Lot