Hi dave,
Some communal TV systems use a proprietary system, so only a certain type of decoder (set-top box) will work - and even though your apartment is ‘wired’ at your end, it may not be connected to anything at the other end until you pay the fee. The ?495 is probably based on the cost of the decoder, plus a share of the cost of the original installation - which wouldn’t have been cheap to start with, but was probably calculated on the basis of 50% of the apartments sharing the initial cost, and would cover the cost of labour, cabling, amplifiers and distribution switches etc.
Try checking with your neighbours to see what decoders they have, and if you can borrow one, check to see if the wiring in your apartment is live. If you can buy a similar decoder locally, then maybe it will work, otherwise you might be able to install your own system.
Stores like Carrefour and MediaMarkt sell Terrestrial Freeview Boxes (TDT) that you should be able to use for Spanish TV with a set-top aerial, but they also sell DIY Satellite TV kits that can pickup English and Spanish Freeview channels from the Astra and Eurobird Satellites at 28.2 degrees East. An 80cm Dish will get many of the Free To Air channels, but you will need a much larger dish to get everything.
This will obviously need for you to be able to point the dish in the right direction, and probably check the restrictions on your tennancy regarding Satellite Dishes.
Alan.