Perhaps some thought should be given to how to structure metadata on buildings (and suchlike) on Commons.
Some of us are aware that the advent of Wikidata has led to a reconsideration of Commons from the "structured data" point of view; which is somewhat stalled right now, though the Creator pages have moved ahead. In other words architects yes, buildings no at present.
In any case, while there is a great deal on Commons, there is also much to be done there.
Charles