Ask them whether they can fit ground anchors or Sheffield stands? Though if it's locked and covered by CCTV I'd probably risk it; you could always get a heavy-duty chain you could leave at work and use to lock the frame to the stand.
For my Bakfiets I've got some Abus city chain thingy that weighs about 2 kg and is gold rated; think it was about £100 a couple of years ago. If I were looking now I'd go to Pragmasis and get a suitable chain and lock.
Ask them whether they can fit ground anchors or Sheffield stands? Though if it's locked and covered by CCTV I'd probably risk it; you could always get a heavy-duty chain you could leave at work and use to lock the frame to the stand.