Probably the two year SOL in CCP 339 ("An action upon a[n] . . . obligation or liability not founded upon an instrument of writing").
The owners of the property - assuming they were actually or constructively aware of the hazardous situation and failed to act reasonably.
Sounds like you ought to consider selling your interest in the property.
No.
P.S. Decisions by a superior court are not binding precedent and almost never are regarded as persuasive.

