Hi, 
1) Since you've already added business as a node, you don't need to add a name for the building.

2) This looks like a legal address. Is any activity done on this address? Doesn't it need to be on the map? OSM is about geospatial data, there is äriregister for keeping a registry of legal entities. Seems like there is also another business registered here this way.

3) If it is useful, the node probably needs an office tag https://wiki.openstreetmap.org/wiki/Key:office . Otherwise there is no way for data consumers to understand what it is.