The idea that you have numerous clients and a $million contract lined up, but will lose everything if you can't move into a specific building, is not credible. Commercial real estate space is largely fungible as you're usually just renting the "box" you have to finish yourself, and there are lots of commercial vacancies these days. If you want your profits, your best bet is to rent another building. Your better claim, assuming you can't find an equivalent building at the same rate, would be to try to sue for the difference in rent.