I want to add a node to a building. This building has multiple, distinct addresses within it. Specifically it is Way: 284735101 | OpenStreetMap
The problem is that the address 251-16 seems to both represent a residence on the 2nd floor and the business on the first floor. The business clearly presents this address above their entryway, and the adjacent residence also uses this address.
As you have found there are different views on usage of addresses, but although we do map individual addresses as standalone elements, I don’t believe they can truly be considered a feature. Mainly they are attributes of other features (buildings, shops, restaurants etc) and in my view should be treated just like other attributes such as cuisine. In other words I think you can repeat the address.
On a practical level associating the address with another feature makes it more readily available for applications which only extract a sub-set of data.
Thank you all for the prompt responses. Given the guidance outlined in this thread, I will make another node with the same address. I will forgo indicating the addr:floor at this time as I do not know if that is included in the official address.