When do you pay a Leasing Agent their commission?

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As a landlord using a Leasing Agent to fill my property, when should I expect to pay the agents? upon signing of the lease or move-in of the tenant? My concern is that the new tenants will still need to complete a move-in condition report and if I pay the leasing agent now, they will have no incentive to follow through with coordinating that upon move-in. Thanks.