Even in a city you're completely surrounded by people who don't have desk jobs. All the people who deliver stuff to your office, the maintenance staff, all retail and restaurant employees, law enforcement and fire/EMS, taxi and car service drivers, and on and on and on.

And that's just what's in an office district. Drive down the NJ Turnpike or something and count how many massive employment centers you see that are primarily not office jobs. Everything from the shopping mall to the refinery to the airport to the distribution center.