If you choose to use a rental agent for “leasing only” purposes, they’ll likely charge you roughly one month’s rent in exchange for marketing and showing your property, screening tenants, drawing up a lease agreement, and ultimately placing a well-qualified tenant in your rental.f you choose to use a rental agent for “leasing only” purposes, they’ll likely charge you roughly one month’s rent in exchange for marketing and showing your property, screening tenants, drawing up a lease agreement, and ultimately placing a well-qualified tenant in your rental.