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.
You could do a lot of travel with a 5-7k budget per month.
There are a ton of variables- agree more analysis is needed.