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Sorry to hear that. Unfortunately, communal bike storage is generally not secure (you know that now, and I don't mean to rub it in, but it's always worth repeating it so people are aware). Keys often proliferate, it may be badly-managed, people may be tailgated, etc., and especially at night, thieves may have a lot of time in a space where they can't be observed (and often not really heard).
Hope you find a lead or some other way of getting it back!
Had my Roberts stolen out of my bike storage on hackney road E2, at some point in the last three days, absolutely gutted, not sure how it was teefed as you need to get through three locked doors to get in there, but following up with building owners, trying to get CCTV etc.
Would be grateful if folks could keep their eyes peeled :)