Throughout the State of Florida, all real estate commissions are Negotiable. Here in Miami Beach, the customary commission paid by the Landlord is either 10% of the annual lease revenue or 1 months rent, again that is negotiable between the two parties. The Listing Broker then shares that, usually 50/50, with the Tenant's agent/broker if the tenant has one. If the tenant has no agent, then the Listing Broker collects the full commission agreed to in the listing agreement. The tenant normally does not pay any commission, but again that is negotiable between the tenant and his/her agent.
Whether you are the Landlord or the Tenant, be sure to ask if your agent or broker charges any other fees on top of the declared commission, so that you can fully understand your financial obligation.