How can I calculate a commercial lease buyout?

We have a well established and profitable business that currently leases space in a strip mall. This strip mall is in the process of being bought out by a developer. who plans to tear down the current building to put up a mixed use condo development. They are now sending out offers to buyout the current tenant... show more We have a well established and profitable business that currently leases space in a strip mall. This strip mall is in the process of being bought out by a developer. who plans to tear down the current building to put up a mixed use condo development. They are now sending out offers to buyout the current tenant leases. We currently have 7 years left on our lease. My question is how can we determine the current value of our lease? Is their a formula that can be used (moving costs, loss of business costs, difference in our current negotiated premium lease rate and comparable lease rates in the area for the time left on our lease, etc...). Also, since the new development has the backing of the city, how can Eminent domain come into play? and if this would go to court, how would the courts determine "fair value" for a buyout? I know a good real estate lawyer is a must, but I am hoping that someone here may have gone through something similar and can answer.

Thanks
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