Well, the organisation owns the property and circuit is actually just renting it. It is up to the parties to agree what is the rental amount and what it is based on, it could be lump sum or based on as it seems on amount of participants (transactional cost). For some reason circuits are not operating regular procurement strategy where they would rfp some suitable premises and choose the best one based on cost/benefit calculation. It could be that organisations premises might win, if they price their services reasonably, but could also loose. But I don't see this happening very much at least.
CP