thanks for the replies guys. Good advice on the crop, and a very valid point about whether the shot is about the people or the building, as it's definitely about the building for me which is why I went for the taller crop and to keep that sense of scale. But it does also work nicely cropped too.
Posted the wrong version sadly, Andrew so I can see your point about the verticals. Will repost again later, although it's only a small correction, I think.