Philadelphia workers who live out of town

Maybe it's illegal for Philadelphia's City Hall to require workers to live in town, but it's kind of a bad idea if they do so—and it's bad for them. I've got some thoughts about public unions I'll be noodling over the next few weeks—I'm for 'em, but they're not without flaws, and those flaws must be addressed—but civic workers who make their money off the taxes of Philadelphia but don't want to live among Philadelphians probably shouldn't expect much sympathy with the politicians come after their pensions.