I've not followed the context of this and I'm no expert but I don't think safe distancing in a modern office environment is feasible. Air conditioning and so on makes it impossible. I think you could only safely put select people back there en masses and it becomes so complicated that it can't be done in practice.
Minor anecdotal blah. Our office doesn't have aircon. It's a modern building, designed to be a bit more efficient I think. Maximum there's about 9 of us in at any one time, usually far fewer than that, often in on my own. As such we could probably easily do SD but not much actually requires us to be present in the office. Only inviting people in for meetings etc. We share facilities with other tenants though. I'll be interested to see if they renew the rent...