I have a 1960's house framed with steel posts and beams, each post secured to a concrete footer. It's an odd house, designed by an architect. Today, I was cleaning what I thought was surface rust from the base of a beam, and discovered it was rusted through at the base, about an inch in diameter. This is the post right between the garage doors, so with all the water and salt exposure, I'm not surprised. This is a load-bearing post, so I don't want to just patch over it without some advice. I'm not even sure what kind of contractor to look for. Maybe a structural engineer?