Hey Anne,

It looks like the two large buildings are adjacent. See regular Esri;
https://www.openstreetmap.org/edit#background=EsriWorldImagery&map=19/52.666697/-7.253590
North side is only grey, south side is grey roof with white walls.
The original location was aligned better, I assume it has not changed since the building is new. The current location overlaps with an -overshadowed- walled, paved area in Esri Clarity.
Also, Bing is distorted here.
https://overpass-api.de/achavi/?changeset=157538809

If you did not see the small shed during survey, perhaps it was a temporary construction building/vehicle. (not sure you are able to see it from the street, however.)

The changeset only lists Bing and Clarity oddly enough, though I am sure you would've already checked.