Castoral Value of Property

I am trying to make a budget for our holiday home in Costa Calida, can anyone tell me approximately the likely Castoral Value of the property compared to purchase price? So I can estimate both the IBI Bill and La Renta Tax Bill.

Many Thanks

Do you already have the catastro number? Was it in the deeds?

Best,

Maria 

Still with our Solicitor will try to get the info.  Many Thanks