If the floor plan and facade was part of the contract, then if the developer changed the plan and removed the facade, the developer is breach of contract. That breach may allow you recover your initial investment and/or seek other compensation. They would also be in breach by not going to arbitration, as the contract requires. Your recourse is to bring a legal action for breach of contract. You would sue for recovery of your investment, but be prepared that the court may order you and the developer to go to arbitration to resolve the matter.