This is agricultural land. You cannot simply buy it and have it has a holiday home with pool, etc… you may have to use/work the land. You need to confirm what sort of structure is permitted on the land, and so on.
Normally for these sorts of plots, the houses on them don’t have build certificates due to age of construction. There should still be habitation licenses, etc… You also need your lawyer to check everything is correct with the land registry and the Junta, not only the town hall.