210 wagon. Worst Mercedes I've ever owned. Rust? This was the first generation that used water borne paints, so expect problems. Spring perches, sure. Watch for rust in the rear gate, front fenders, dog legs. Electronics, window lifters, seemingly simple things can be expensive. The early 210's had a problem with the crank balancer disintegrating. A/C system has a half life of five years, difficult to diagnose, costly to fix. If you have a stalling problem, replace the crank position sensor, they can fail without throwing codes. One stupid simple thing: make sure you can undo and retighten the wheel lugs. Shops tend to overtighten, and they're prone to snapping.

That said, at this remove in time and with this many miles, every example is going to be its own story. It may be a thin veneer over a heart of rust. Maybe it spent it's live commuting in the salty wet northeast, or maybe it's been basking in the California sun. Previous owners may have slogged through the problems and cleaned things up, or you may have to undo countless hacked repairs. Don't pay much, don't expect much, don't be disappointed.