Hello Daniel, that the node of a house no. are to be seen, is no question (could be also any closed restaurant/shop, thus disused:amenity=restaurant or disused:shop=XX + disused:name=XYZ). So it is no guarantee, only because I see a house no. and was possibly entered with building =XX, that there is also a building there. Because just with you in the USA see parks which are provided with an address (https://www.openstreetmap.org/way/208357832), for whatever reason, and if one makes then from over on the other side of the large pond times what and sees still another white stain and thinks itself to give to that some color, but punctual are several house no. in it, I do not know whether it is to be assigned now to the building or the park.
Whether the housernr. now on site or by a data donation occurred is what else.
Greeting Rüdiger

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