In what section do I enter real estate agent related itemized deductions?

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Are you an employee?  If you are an employee then any of your real estate agent expenses  will go on schedule A as employee business expenses.

Click on  Deductions and Credits, and scroll down until you find Employment Expenses-W-2 Income

If you are self-employed, than both your commission income and your expenses will be reported on schedule C.  

Click on the search box and type "schedule c" and press enter.  A Jump To option will be available.