Posted: Mon Jan 22, 2018 3:59pm
Assuming your build is legal (?!) then I would have thought you will have an address, as it identifies your parcela. However you're at the limit of my knowledge here. You can then arrange with the Correos if you want them to keep the post for that address in a box there.
Our nearest neighbour is about 1km away and seems keen to help (but then he likes hunting on my land). He told me where his box is, and we put one up next to his and told them at the Correos. So far so good....