fisk in errol st

This is close to a non-post but I just want to say that Fisk, which is a funny show, was (is?) I guess set in Errol st, or at least, a lot of the external scenes were shot in North Melbourne and the actual Gruber and Fisk windows are visible from the street, though I am uncertain about whether anything is actually filmed in those rooms up there surely there'd be too much noise from the street. 

I am a bit too stupid to understand this, as well. This doorway is the only doorway to the first floor:

But either they install a fake doorway into this doorway for the show (most likely explanation) or they use some amazing digital trickery. 

Or I am nuts. When I went to photograph the doorway above there was some dodgy character hanging around I didn't want to talk to so I took a quick picture then left and maybe I got it wrong, though I think the physio place is in the same position to the doorway in both images. 

Please don't think I think it matters.