We do a lot of year round rentals in this office, and since we work for the landlord in 95% of the cases, they are our clients, and the tenants are our customers. In our standard lease forms, (Blomberg 1976), we write a clause that includes another commission due to our firm if the tenant, (or their assigns), renews or purchases the property. We do that because our clients often want a renewal after our customers' first year, without the rental income having a gap, and often houses that we rent are also for sale. The landlords would pay that renewal commission for the next tenant anyway, sometimes with a long gap in rental income to find the right tenant. That being said, nobody can attempt to answer your specific question without reviewing the language in the lease you authorized, which we would have to assume is a legal binding contract.