My understanding is that's kind of a regional thing. California markets typically quote $/sf/month and pretty much the rest of the US does $/sf/year. Too easy to confuse. Been a while since I was in that game though.

But yes, you're right that typical high rise office space in the bay is around $50-80/sf/year or $4.50-7/sf/mo. Or $450-700/mo per employee at 100 sf per employee.