You have a complex legal problem and need to see a real estate attorney. Sell your interest, or buy out your uncle. The easiest way to resolve a valuation dispute is to offer to buy or sell the 50% interest. If you acquire 100% of the property, you can then sell it. Note that if the LLC's rights have been suspended, the LLC cannot sell the property without its rights being reinstated. You have tax issues with the Franchise Tax Board, and, if you acquire the property, you need to coordinate the sale with paying the FTB.
Answered on Dec 18th, 2012 at 1:03 PM