Also consider headquarters location (P159) in Nearby

[nicolas-raoul]

Some items have a P159 (headquarters location) with a nested P625, but no P625 (coordinates location).
Example: https://www.wikidata.org/wiki/Q908077

Since such items are rather numerous, we should take them into account in Nearby.

I suggest waiting until Nearby is asynchronous (load items first, then load the properties of each item) before implementing this.
Even then, a first request using P625 and a second request using P159 would be the best to avoid adding request time.

There is no strict consensus on whether such nested coordinates are a good idea or a bad idea, which unfortunately means we should support both:
https://www.wikidata.org/wiki/Wikidata:Project_chat/Archive/2021/03#coordinate_location_(P625)_to_headquarters_location_(P159)_switch
https://www.wikidata.org/wiki/Topic:W5d3dstxpky3z5sl