You can have multi room out of a single feed cable - I do. You need to buy a SCR which SKY make and can supply although nobody at SKY ever seems to know about it. Who provides the SKY network infrastructure in your building? Maybe they will know and be able to help. I've had mine for about 2 years now and it works fine.
Should also have mentioned the single feed (via the SCR) services 2 SKY+ HD boxes one of which is a regular the other a 2TB. I can watch the same channel in either room or record the same channel or watch different channels and record different channels. It is fully functional.