Before you remove contingencies on a California luxury property, these are the 5 documents that determine whether you're buying a home or a code enforcement file. A due diligence checklist for buyers and agents from CODE360, drawn from a real Napa Valley case.

A recent Napa Valley pre-close due diligence review uncovered $26,970–$62,345 in code exposure hiding in a 450-page disclosure packet. Here's what the buyer's team almost missed — and why the 17-day contingency window matters more than most buyers realize.