Tearing it down would be the prudent thing to do.
Crappy soil, crappy foundation , earthquake zone = three strikes
A 6.0 or higher earthquake should solve this problem permanently.
If your sills were shot and your
timbers was okay, I’d say fix her up.
If your timbers were shot and sills
was okay, I’d say fix her up.
But your sills are shot
and your timbers are shot.