You just need a couple of meeting rooms next to each to run a mobile vaccination clinic I reckon.

So any employer large enough to keep a pair of nurses and an admin person busy all day would be worth doing in the office.

20 people an hour per nurse, is about 300 people. Or a thousand people if you're doing 1 a minute.

There are about 700 pupils and staff at the Captain's primary school. About the same in my office block.