Planning permission, digital signatures and holiday rentals

Hi everyone

Thanks for the help in how to find the owner of the property and I now have the Nota simple. 

It shows my father in law as the registered owner but he died nearly 38 years ago.

I paid 15 euros to ask a question and all it says is that no new deed has been registered so it looks as though brother in law has done nothing about it. I know FIL had a will as shortly before he died he gave us a copy of a letter he had sent to my brother in law stating that the substantial sum of money he owed would be deducted from his share of the estate as outlined in his will. 

My first question is that BIL built an extension and a swimming pool which appears on the registry so he presumably had planning permission but could he do this without being the property owner.?

Secondly, there is a 2,500 eu charge on the property for outstanding urbanisation fees dated 1995 so presumably he has been paying them and the taxes since then but as far as I can see there is no way of accessing these without a digital signature and the same for the valuation certificate. Is there any way round this? 

Thirdly, he has been letting out the villa with VRBO for at least nine years so should he have a license to do this and presumably pay Spanish tax on this income.

I just find it all rather unbelievable that he has got away with this for so long especially since Brexit which was a nightmare in Greece where we lived for 14 years. The bureaucracy there was terrible and it felt almost like you could not even breathe without a paper in triplicate and officially stamped and a fine if you don't have them.

Like I said, at the age of 82, I am loathe to get into a long legal wrangle and a part of me feels maybe I am opening a can of worms and ending up taking part responsibility for his shortcomings.

Thanks a lot

Barbara