Simple bookkeeping question re reimbursements

Hi. I am a somewhat ignorant bookkeeper in that if something comes through I haven't dealt with before, I don't really know how to handle it. Here is my current scenario. Landlord agrees to pay for landscaping services. Tenant hires Gardener. Gardener gives Tenant invoice and instead of passing it on to Landlord, Tenant pays invoice. So, here's what I have: Acct Payable Checking Gardener Inv (so I can track for 1099) $300 Reimburse Tenant $300 My question is, since Gardener has already been paid, how do I get the $300 out of Accounts Payable? Thanks in advance, Elizabeth