a very mysterious door

i know a lot of you like mysterious doors. my colleague harry pointed this out to me. i can see it from my desk out the window (why DO they put my desk out the window).
i’ve never seen anyone open it. perhaps i need a brick door webcam ?
ntoe the curving distortion of the bricks in this picture. hoorah for converging verticals (and horizontals). they used to be so uncool you know.
DSC03447.jpg
by request (via comments) here is a close up of the signage which only adds to the mystery:
DSC03447b.jpg

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