Is it possible that the 3,617 square foot number is TOTAL square footage or "total area"? Meaning, it would include the garage and any screened in lanai/porches? If this is the case, the 2,829 would be square footage under air or "living area".
I don't know if this is the case in California, but here in Florida, every listing has two numbers that represent square footage and this is the difference.
Hopefully this helps!!
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