House numbers are not literally "house" numbers in Italy - they are more "entrance" numbers. It is the number associated with the external access that leads from the circulation area (street, square, etc.) to property units (dwellings, shops, offices, garages, etc.) or to unbuilt enclosed areas (e.g. beach clubs). Therefore it is wrong to tag buildings with addr:housenumber. Moreover what are these "addr:state=88" tags? We don't use addr:state in Italy. BR, Andrea