Do I have a case against a denial by a town planning board to take it to the county and/or state supreme court level to be overturned?

- lot never been built on; size 50x150 (pre-existing, non-conforming) - zoned for residential use - there are numerous other 50x150 lots built on on the same street and tons in the town already - we are under contract for the purchase of this land - our current lawyer did research prior to our contract; asking the town if any history on this lot - answer NO applications ever - we complied to the town's requests of what is required for our application (soil samples, surveys, engineer fees, attorney fees, architectural plans) - we are at least $20k into this application - our planning board meeting was sched for April 28th (4 days prior - the Thursday before easter) the town engineer says she conveniently now found (after we have asked and search at least 3 times before) that there has been two prior applications (one in 1981 and one in 1990) both denied for res judicata - now we have our mtg that was reched for this Tues and will be turned down for res judicata Do we have any