FEM90, if you read your deeds, if your property is situated on a private road, yes unfortunately you will have to pay your proprotion of rates, as far as I understand it is on size of property, pay a quarterly charge.
If you google Community of Owners for Spain, you will have a better understanding. Regrettably the builders have gone into liquidation, the company MASA as I understand should have set up the Poligono's ( they would have gained in setting up the Poligonos) and buyers should have been made aware.
I have empathy for the owners, that have been on Camposol from the start, not paid any monies towards the Community of Owners, now they are being asked too, then again so is everyone else in the same situation.
Other urbanisations that have been set up throughout Spain, no doubt have a Community of Owners, but can't vouch for that, as I've bought and will enjoy the great community of Camposol, look forward to a Community of Owners being set up on the sector I've bought on.