So, my understanding is now that fomite transmission is a red herring (so we can stop worrying about elevator buttons), there's two main ways of transmission:
1) Carrier sneezes / sings / coughs / yells on someone spewing massive quantities of droplets. Mitigation for this wearing cloth masks, plexiglass screens, the six foot rule to prevent the spray of droplets from reaching another person
2) Infectious does builds up over time in the air of a poorly vented environments, like a bar, and person receives an infectious does by spending a large amount of time there. Mitigation for this is using drive-thrus or curbside pickup, or at the very least minimizing your exposure time using takeout instead of dine-in,, better ventilation, better filters, operable windows to dilute the virus and reduce the dose you receive. This is not norovirus where just a couple of virons can make you sick, the thinking is it takes at least 100.
The way to make offices safer would seem to be to both increase allotted space and improving ventilation.