Hi Carmel
Unfortunately, there is no scope to grant an exemption, if the land is owned by council, then I assume council is paying the rates and charging the tennis club outgoings in accordance with the lease? If so, then Council could move to a contribution in the lease rather than full recovery of outgoings.
We have done this for some charities that lease from us which is negotiated during the lease. If the council takes this path for one club, then I would recommend constructing a policy around the decision because all lease holders will have a view that they are not making a profit so should also be exempt too.
I hope this is helpful.
Regards,
Andrew