Anyway, here is the outside of the hotel, I'll show some shots from the interior in the next post so as not to crowd this post too much.
I did hear a rumour on a Facebook group that the film crew installed the revolving door specifically for the film and then uninstalled it again once filming ended. If anyone can confirm it would be an interesting little tidbit - especially as the revolving door is only really involved in one or two on screen gags. Anyway, looking at this Streetview grab below you can see that buildings next door to the hotel are the same as they were back in 1978 but the Caltex petrol station has gone (though I don't know when).
Incidentally, there was a recent newspaper report that the Mandarin Oriental Hotel Group (that owns the Excelsior and is itself part of the huge massive Jardine Matheson Group) had recently had the hotel valued in a view to redevelopment. It caused rather a panic because this hotel is a very famous and familiar part of the HK harbourfront but the company denied it had any intention of selling the land. All is calm at the moment but in HK these days there doesn't seem to be any smoke without fire. Time will tell.