The owner is trying to rip you off. 1000m2 of land in Manilva is not worth 180k with planning permission. Was the owner smoking crack?
Without permission, remove the 0 and you’ll be a lot closer to the real value.
(Just as a reference, I was offered 25,000m2 of land in Casares with planning permission for 300k a few years ago when house prices were considerably higher)