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I am a member of the State Bar of California, the U.S. District Court for the Central District of California, and the California Association of Realtors.
Your rights concerning the date of completion is generally controlled by your purchase agreement. The only way that I could possibly provide competent advice in this matter would be to review the contract. If that's something that would interest you, I can send you an additional services offer and we can take the matter offline (customer legal services fees will apply).
The only other possibility would be proof of misrepresentation. This would require some marketing literature, or a witness to a statement by a representative of the developer, demonstrating that you were induced into buying the property based upon the developer's representation that the property would be completed by a specific date. Misrepresentation claims are difficult to prove, but if you can do so, then you would have a claim for damages against the developer.
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