You might want to look around. The rates can vary greatly, but they can also be dependent on how much work the host venue contributes to the arrangement. I’m doing a lot more workshops and classes outside my home gym now and it’s been surprising the variety of ways people charge.
At one place, I’m paid about 1/3 of what the company charges, but they advertise and sell spots on my behalf and all I have to do is show up and teach.
At the second place, I pay 33%, but they do zero marketing.
Another place, we co-market and the split is 50/50.
The best deal I’ve got lets me have the place for 2 hours for a very reasonable fee and I have unlimited upside income for the same flat rate. I can advertise on their facebook page but I can’t put signs up in their facility.