I can not get to the nut with a basin wrench, to loosen it. Any ideas?

Is the basin wrench too short or what? That's a Delta faucet , right?

Yes it is a Delta. The pedestal is to tight to get the basin wrench into the nut. Is there any other device?
I really did not want to pull the pedestal and sink off the wall.

Unfortunately that is how it was originally installed. You hav:De to reverse the installation