Usually realtor charge one months rent. It is up to the landlord if he or the tenant is to pay the fee. In your case the tenant is to pay. You can always ask to split it. I’m a realtor in Boston but don’t really do rentals but sounds standard. Now if the agents name was tom smith from All star real estate and they asked you to write the check out to tom smith not all star real estate then that would be weird. It’s always written out to the brokerage ( ex. Coldwell banker). Quick google search should help verify the agent.