Hi there, Jeanine.
Welcome to the Community. Since the property taxes are paid by the lender and be deducted from the rental fee they paid. We can create a Service item. From there, change the income account to Expense (Property Tax). Then we can utilize it as a Credit Memo so the rental balance to be paid by the lender will be deducted.
To learn more on how to give a credit memo to your customer, please check this out: Record a credit memo or refund in QuickBooks Desktop.
For your additional reference about credit memo and QuickBooks Desktop, you can check the following articles:
Please feel free post again or leave a comment should you need anything else. I'll be happy to answer them. Have a great day!