This is the rust on that car. Three doors have rust on buttom.
Here is the deal breaker, the other door, passenger's side has no visible rust outside on buttom, but when you open the door...
I spoke to Otto's collision this evening and I was told there is a really good change that door is rusted through, because water collects there and it rusts from inside.
What this means? Replacing the door and refinish.
Personally I wouldn't care if all 4 door had rust bubbles which can be grinded and painted, but rust through is a whole different story.