A business writer friend of mine told me a month or so ago that, based on a sampling of key swipes, office occupancy is down about a third compared to pre-pandemic although I'm sure it varies a lot.
I can't find the reference but, as I recall it was a drop from 65% pre-pandemic (that may seem low because pre-pandemic a lot of people still traveled or otherwise weren't in the office on a typical day) to around 40% these days. I'm told my workplace is quite a bit lower as well.
Yeah, re: my 'lights are on, but nobody home' anecdote from the peninsula - I'm specifically referring to butts in seats. Said seats are currently very relaxed and well aired out compared to typical.