In the UK we have a heuristic that by the time a tech giant builds a big UK campus (an imitation of their SV HQ) then you know they are in the decline phase. Some of them decline so fast they don’t even get to fully complete the campus, yet others seems to have beaten this curse… so far.
They have more than one building at King's Cross. One has been finished for ages but the new one I don't think is done. Not sure what happened to the fox on the roof. (https://news.ycombinator.com/item?id=44229727)