This is a situation for your attorney. It is not uncommon for new developments to have delays as it is work in progress and the closings and occupancy are always "proposed" if you are going into contaract in a building that is pre-occupancy. It is a question of how your contract was structured and what protections are built into it for you versus for the developer. Your attorney will be the one to know the details, guide you through and let you know what your options are.
Have you requested that the builder compensate you for the inconvenience (i.e., pay for the hotel, etc.)?
Good luck- unfortunately, your problem is not uncommon.
I have done many new development deals and have come across this situation many many times. I have seen developments been delayed for almost 2 years, and purchasers have not been given anything in return for their patience. In my experience, I very rarely find sponsors completing their projects on time. I have also been in a situation that the sponsor delayed the completion of the building and that in turn expired my customers mortgage commitment. The market changed and my client had an extremely hard time getting another mortgage commitment. That almost cost the purchasers their initial deposit. Alot of things can happen when buying new development. Please let me know if there is anything else i could assist you with.