did you consider creating Wikidata items for the buildings? That would give you
* a list of buildings to work on
* a map of these (see )
* the ability to store, and query on, metadata (e.g. year build)
I have no idea if you have any of this metadata, or how easy it would be to get it.
(green=Wikidata with image, red=Wikidata without image, blue=photo on Commons,yellow=Wikipedia article)